There are plenty of things that can ruin a beach day in Panama. A sudden tropical downpour. A broken flip flop. Forgetting sunscreen. Getting your phone soaked on a water taxi.
And then there are chitras.
They are tiny. They are difficult to see. They make almost no noise. They can be so small that you spend an entire afternoon convinced that nothing is biting you, only to discover later that your legs and ankles are covered in intensely itchy little bumps.
For anyone travelling around Panama's beaches, islands, mangroves and tropical coastline, learning about chitras can save an otherwise perfect day.
So what exactly are chitras?
“Chitra” is a common Panamanian name for tiny biting insects generally associated with biting midges, particularly insects in the family Ceratopogonidae. Depending on where you are in the world, you may hear them called no see ums, biting midges, sand flies, punkies, jejenes or sandflies. The terminology can be confusing because different regions use the same names for different tiny biting insects.
In Panama, locals may simply tell you:
“Cuidado con las chitras.”
And experienced travellers know exactly what that means.
These insects are unbelievably small. Some Culicoides biting midges are only around 1 to 5 millimetres long, making them difficult to spot even when they are actively biting.
That tiny size is precisely what makes them so annoying.
A mosquito lands on you and there is a reasonable chance you will notice it.
A chitra can be working on your ankles while you are lying on a beach towel, completely unaware.
Why can they destroy a beach day?
The problem isn't necessarily the moment of the bite.
It is what happens afterwards.
A person can spend two or three hours sitting on a beautiful tropical beach, swimming, reading and enjoying the scenery while dozens of tiny midges are quietly taking advantage of exposed skin.
Then, hours later or even the next day, the itching begins.
And for some people, the reaction can be surprisingly intense.
Panama's Gorgas Memorial Institute describes the bites of these tiny insects as potentially producing painful bites followed by itchy swelling.
This creates the bizarre experience of having a wonderful beach day and only discovering later that the beach has effectively declared war on you.
They have an enormous number of names
This is particularly confusing for travellers moving around Central America and the Caribbean.
You may hear:
Chitras
No see ums
Biting midges
Sand flies
Jejenes
Punkies
Sandflies
Biting gnats
The Pan American Health Organization lists biting midges under names including no see ums, jejenes, mosquitos polvorilla and chaquistes, depending on the country and region.
And there is an important distinction here.
The term “sand fly” is used rather loosely by travellers. In scientific terminology, several different groups of tiny flies can be called sand flies, and not all of them are the same insect.
So if someone says, “There are sand flies on this beach,” that does not necessarily tell you exactly which insect they mean.
In Panama, chitra is often the most useful local word to remember.
The most dangerous time for your beach day
This is where things get interesting.
There isn't one universal “chitra hour” throughout Panama because different species behave differently. But biting midges commonly become more active around low light, particularly during the late afternoon, evening and morning. The Pan American Health Organization says Culicoides are mainly active in the late afternoon but can also be active at night.
Research on Panama's anthropophilic sand flies has also found substantial biting activity during crepuscular periods, with some species showing particularly strong activity around evening hours.
For a beach traveller, this produces a useful practical rule:
Be especially cautious around:
Early morning
Late afternoon
Sunset
The period immediately around dusk
A local Panama source describing chitra activity recommends particular caution around sunrise and late afternoon, while traveller reports from places such as Bocas del Toro similarly warn about early morning and sunset periods.
The exact timing can vary, but sunset is the big one to remember.
That beautiful hour when the temperature drops, the wind disappears and everyone wants to sit on the beach with a drink?
That can also be prime biting-insect time.
Midday can actually be your friend
This is one of the most useful things to understand.
If you are determined to spend hours sitting directly on a beach, the middle of the day can sometimes be a better choice than dawn or sunset.
Biting midges vary enormously by species, habitat and weather, but many species prefer low-light periods. Research from Florida, for example, notes that many biting midges generally bite around dusk, night or morning, while also emphasizing that some species can bite during daylight, particularly in coastal environments.
So don't interpret this as:
“There are no chitras at noon.”
There absolutely can be.
Instead think:
“The risk may be lower in bright, breezy conditions than during a calm sunset.”
That distinction is much more useful.
Wind is your best friend
This may be one of the most useful practical tricks for beach travellers.
Chitras are tiny flying insects.
A strong breeze makes life considerably more difficult for them.
This is why you can sometimes sit on one part of a beach and experience almost nothing, then walk around a point or behind vegetation and suddenly become a buffet.
A beach with a steady ocean breeze can be dramatically more comfortable than a sheltered patch of sand surrounded by vegetation or mangroves.
If you are choosing where to put your towel, look for the breezier part of the beach.
A fan is also useful around accommodation because moving air can make it harder for tiny biting insects to land.
Weather matters too
Chitras are particularly associated with moist environments.
Their larvae can develop in places such as wet soil, muddy areas, decaying vegetation and other damp habitats.
This means conditions can change dramatically from one day to another.
A hot, dry and windy beach afternoon may be fantastic.
A humid, cloudy afternoon after several days of rain can be completely different.
A traveller report from Panama's Azuero Peninsula similarly notes that chitra problems can be worse during the rainy season and around wet or humid areas.
So if you hear locals saying:
“Today there are a lot of chitras.”
Believe them.
They are often talking about current local conditions rather than giving you a permanent description of the beach.
Rain can change everything
One of the worst combinations is a beautiful tropical location with recent rain followed by calm conditions.
Wet soil and organic material provide suitable breeding environments for biting midges, while calm conditions make it easier for the adults to fly around people.
That does not mean every rainy day will be full of chitras.
But if you have had several wet days followed by a calm evening, it is worth taking extra precautions.
This is one reason locals can sometimes predict chitra problems better than tourists can.
They have experienced the pattern repeatedly.
Your ankles are worth protecting
If you only want to protect one part of your body, don't forget your ankles and lower legs.
You can be wearing a T shirt and shorts while sitting on the beach, leaving huge areas of skin available to tiny insects.
Loose long pants are one of the most effective physical barriers when conditions are bad. The CDC recommends covering exposed skin with loose fitting long sleeves and pants as part of protection against biting midges and other biting insects.
This may sound ridiculous when it is 30°C and everyone else is wearing a bathing suit.
But if the chitras are out, you may suddenly become very happy that you packed lightweight hiking pants.
Repellent can make a huge difference
Not all insect repellents are equally useful.
The CDC recommends repellents containing active ingredients such as DEET or picaridin and specifically notes that products labeled for biting flies or no see ums can be effective against biting midges.
For a Panama backpacker, carrying a small bottle of effective insect repellent is therefore worthwhile even if mosquitoes don't normally bother you.
And remember the sunscreen trick:
Sunscreen first. Repellent second.
The CDC recommends applying insect repellent after sunscreen.
Don't rely on an ordinary mosquito net
This is another nasty surprise.
Chitras are so small that ordinary mosquito protection may not always be enough.
The CDC notes that conventional screens can have openings large enough for biting midges to pass through and recommends much finer mesh where midges are a concern.
That means the tiny insects can sometimes get into places where mosquitoes cannot.
This is particularly relevant when sleeping in rustic accommodation close to mangroves, wetlands or other breeding habitat.
Where should you be most suspicious?
Think about the chitra's preferred world.
Wet.
Humid.
Sheltered.
Organic material.
Mangroves.
Marshy areas.
Wet sand and soil.
Vegetation around beaches.
River and lagoon edges.
That doesn't mean you should avoid these environments. They are some of the most beautiful ecosystems in Panama.
It simply means you should pay attention to the conditions.
A wide open beach with strong wind can be wonderfully comfortable.
A tiny sheltered beach beside mangroves at sunset can be a completely different story.
The sunset trap
This deserves its own warning because it catches backpackers constantly.
Imagine the perfect evening.
The sun is dropping.
The heat is disappearing.
The ocean is calm.
You have a cold drink.
You sit down on the sand.
Everything feels perfect.
Then the wind dies.
And suddenly you start feeling tiny pinpricks on your legs.
You cannot see anything.
You slap your ankle.
Nothing.
Five minutes later you slap it again.
Still nothing.
You leave the beach and think you escaped.
Then the itching begins later.
That is the chitra trap.
The most beautiful time of day can also be one of the worst times to sit motionless on exposed skin.
How to plan the perfect chitra resistant beach day
The smartest strategy is not avoiding beaches.
It is planning around the insects.
If possible, visit the beach during brighter, breezier periods.
Apply repellent before you arrive rather than waiting until you start getting bitten.
Bring lightweight long pants or a long sleeved shirt if you know the area has chitra problems.
Choose an exposed, breezy section of beach rather than a sheltered spot beside vegetation.
Be especially careful around dawn and dusk.
If the wind suddenly disappears around sunset and you start noticing tiny bites, take the hint and move.
You don't have to prove anything to the chitras.
And don't assume every tiny bite is a chitra
This is important.
Panama has mosquitoes, biting midges, sand flies and other biting insects. Not every itchy bump after a beach day is necessarily caused by a chitra.
There are also medically important biting insects in tropical Panama, and some sand fly species can transmit cutaneous leishmaniasis.
Biting midges can also transmit pathogens such as Oropouche virus in parts of the Americas, although that does not mean every chitra bite in Panama results in disease.
The sensible approach is simple: prevent bites rather than panic about them.
If you develop unusual symptoms such as fever or feel significantly unwell after insect exposure, seek medical advice.
The Panama backpacker's chitra survival rule
There is no reason to be afraid of Panama's beaches because of chitras.
They are simply one of those small realities of tropical travel that you learn to work around.
The experienced traveller doesn't necessarily know how to eliminate every insect.
They know when the insects are likely to be worst.
They notice when the wind disappears.
They recognize the wet, sheltered environments where biting midges can thrive.
They carry repellent.
They cover their ankles when necessary.
And they know that sometimes the smartest response to a suddenly insect filled sunset is to grab the towel, move somewhere breezier and enjoy the sunset from a slightly different location.
Because Panama has thousands of spectacular beaches, rivers, islands and coastal landscapes.
There is no reason to let an insect that is barely visible to the human eye win the entire day.
Just remember the three big rules:
Wind is your friend.
Dawn and dusk deserve extra caution.
And when someone in Panama says “cuidado con las chitras,” listen to them.