Poritia hewitsoni
In 3 days ~50% in a week ~80%
Poritia hewitsoni, the common gem, is a small butterfly found in India, Myanmar, Thailand, Malaysia and Vietnam that belongs to the lycaenids or blues family. It ranges along the Himalayas from Kumaon to Assam in India and onto Myanmar. Recorded from Mangan and Rangpo in Sikkim.
It is a small butterfly with a 31 to 38 mm wingspan. Male upper: dark iridescent blue, usually with submarginal and apical spots. The cell on upperside forewing is entirely devoid of blue or with a minute blue spot at the base in some cases. Males also have a tufted brand on the upper hindwing above vein 7. The underside is brown with variable pale lineation. Females: brown above, with a few blue spots. The upper forewing has a yellow discal patch above a blue area. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Dehradun | 🇮🇳 India |
Possible
About 20% of wildlife watchers report a Common Gem sighting in Dehradun on a given day, based on 10 verified sightings from GBIF citizen-science data. It is the 26th most-seen of the 73 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.
December and January
In those months about 40% of wildlife watchers report a Common Gem in Dehradun on a given day, against under 5% in February–May, July and October, the lowest months. Those are among Dehradun's driest months, with about 25 mm of rain a month against 370 mm in July.
Only Dehradun, in our data
Dehradun is the only city on Wallace's Line with enough records to rate Common Gem sightings: about 20% of wildlife watchers there report one on a given day.
Same family: Lycaenidae
The closest relatives of the Common Gem that you can see in Dehradun (family Lycaenidae, Gossamer-winged Butterflies) are Red Pierrot (about 40%), Double-Banded Judy (about 20%) and Pale Grass Blue (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Common Gem is recorded against all the insects logged in Dehradun (10 verified sightings), 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.
