Jamides bochus
In 3 days ~20% in a week ~50%
Jamides bochus, the dark cerulean, is a small butterfly found in Indomalayan realm that belongs to the lycaenids or blues family. The species was first described by Caspar Stoll in 1782. Male upperside, forewing: velvety jet black; base deep blue, beautifully metallic and shining, measured on the dorsum this colour occupies three-fourths of its length from base, its outer margin then curves upwards just past the apex of the cell, enters into the bases of interspaces 10, 11 and 12 and fills the whole of the cell. Hindwing: costal margin above subcostal vein and vein 7, and dorsal margin narrowly fuscous black, a medial longitudinal pale streak on the former; terminal margin narrowly edged with velvety black, inside which in interspaces 1 and 2 is a slender transverse whitish line, with an elongate irregular transverse black spot above it in interspace 1 and a more obscure similar spot in interspace 2; traces of such spots also are present in some specimens in the anterior interspaces. Cilia of both forewings and hindwings black; filamentous tail at apex of vein 2 black tipped with white. Underside: dark chocolate brown. Forewings and hindwings; transversely crossed... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Taroko National Park | 🇹🇼 Taiwan |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Chattogram | 🇧🇩 Bangladesh | |
| 2 | Bengaluru | 🇮🇳 India | |
| 3 | Mumbai | 🇮🇳 India | |
| 4 | Tuen Mun | 🇨🇳 China | |
| 5 | Salem | 🇮🇳 India | |
| 6 | Colombo [Sri Jayawardenepura Kotte] | 🇱🇰 Sri Lanka | |
| 7 | Taichung | 🇹🇼 Taiwan | |
| 8 | Pune | 🇮🇳 India | |
| 9 | Hong Kong | 🇨🇳 China | |
| 10 | Taipei | 🇹🇼 Taiwan |
With luck
About 10% of wildlife watchers report a Dark Cerulean sighting in Kolkata on a given day, based on 19 verified sightings from GBIF citizen-science data. It is the 108th most-seen of the 213 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
March and April
In those months about 20% of wildlife watchers report a Dark Cerulean in Kolkata on a given day, against under 5% in January–February, July–September and November, the lowest months. Those are among Kolkata's driest months, with about 40 mm of rain a month against 330 mm in July.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Dark Cerulean sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
13th of 21
Of the 21 cities where we can rate Dark Cerulean sightings, Kolkata ranks 13th at about 10%. The best odds are in Chattogram (Bangladesh, about 20%), Bengaluru (India, about 20%) and Mumbai (India, about 20%).
GBIF citizen-science records
It is estimated from how often the Dark Cerulean is recorded against all the insects logged in Kolkata (19 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.
