Prosotas dubiosa
In 3 days ~30% in a week ~60%
Prosotas dubiosa, the tailless lineblue or small purple lineblue, is a blue butterfly (Lycaenidae) found in Asia to Australia. The species was first described by Georg Semper in 1879. Unlike many other species in the Prosotas genus, P. dubiosa does not have hair-like filaments ("tails") protruding from its hindwings, thus the tailless in its common name.
Prosotas dubiosa subardates (Piepers & Snellen, 1918) - Java, Sulawesi The butterfly occurs in Sri Lanka and peninsular India and the Himalayas from Sikkim to Assam. The range extends onto Myanmar and Yunnan, and, possibly Thailand, Peninsular Malaysia, Singapore, Hong Kong, Sumatra, Borneo and Java. Possibly Philippines and Sulawesi. Further east the butterfly occurs in Australia, New Guinea and the Solomon Islands. In Australia the butterfly occurs from Northern Australia to New South Wales (Coffs Harbour).
List of butterflies of India (Lycaenidae... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cuc Phuong National Park | 🇻🇳 Vietnam | |
| 2 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 3 | Kakadu National Park | 🇦🇺 Australia |
With luck
About 10% of wildlife watchers report a Tailless Lineblue sighting in Hong Kong on a given day, based on 125 verified sightings from GBIF citizen-science data. It is the 98th most-seen of the 1125 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
May
In that month about 20% of wildlife watchers report a Tailless Lineblue in Hong Kong on a given day, against under 5% in February and August, the lowest months. That is one of Hong Kong's wettest months, with about 210 mm of rain against 25 mm in December.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Tailless Lineblue sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
9th of 21
Of the 21 cities where we can rate Tailless Lineblue sightings, Hong Kong ranks 9th at about 10%. The best odds are in Jabalpur (India, about 30%), Tuen Mun (China, about 20%) and Salem (India, about 20%).
GBIF citizen-science records
It is estimated from how often the Tailless Lineblue is recorded against all the insects logged in Hong Kong (125 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.
