Celaenorrhinus spilothyrus
In 3 days ~50% in a week ~80%
Celaenorrhinus spilothyrus, commonly known as the Sri Lanka black flat, is a species of butterfly in the family Hesperiidae. It is found in India and Sri Lanka. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sinharaja Forest Reserve | 🇱🇰 Sri Lanka |
More parks will be added in future updates.
Possible
About 20% of wildlife watchers report a Sri Lanka Black Flat sighting in Sinharaja Forest Reserve on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 38th most-seen of the 117 insects we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
November
In that month about 40% of wildlife watchers report a Sri Lanka Black Flat in Sinharaja Forest Reserve on a given day, against under 5% in June, August, October and December, the lowest months. That is one of Sinharaja Forest Reserve's wettest months, with about 490 mm of rain against 150 mm in March.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Sri Lanka Black Flat sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Only Sinharaja Forest Reserve, in our data
Sinharaja Forest Reserve is the only park on Wallace's Line with enough records to rate Sri Lanka Black Flat sightings: about 20% of wildlife watchers there report one on a given day.
Same family: Hesperiidae
The closest relatives of the Sri Lanka Black Flat that you can see in Sinharaja Forest Reserve (family Hesperiidae, Skippers) are Restricted Demon (about 20%), Common Banded Demon (about 10%) and Chestnut Bob (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Sri Lanka Black Flat is recorded against all the insects logged in Sinharaja Forest Reserve (11 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
