A LIST OF THE BUTTERFLIES OF BORNEO. 89 
Sub-genus, NVeopithecops, Distant. 
297. Lycaenopsis (Necpithecops) zalmora, Butl. 
Pithecops zalmora, Butler, Cat. Fabr. Lep. B. M. p. 161 
(1869) 
Pihtecops hylax, Moore (nec Fabr.), Proc. Zool. Soe. 
Lond. p. 587 (1877). 
Pithecops dharma, Moore, Lep. Ceyl. Vol. I. p. 72, pl. 
SOON Galle, 25 Ve) (rei) 
Parapithecops gaura, Moore, Journ, As. Soc. Beng. p. 20 
(1884). 
Neopithecops horsfieldi, Distant, Rhop. Malay. p. 210, pl. 
aa, 1G, a, (exces). 
Labuan (Low); Limbang, Banting, Samarahan, Kuching, 
Mt. Matang—3,200 ft., Mt. Penrissen' (Sar. Mus.) ; South- 
Kast Borneo (Doherty). 7 
Distribution: India, Ceylon, Andamans, Burma, Singapore, 
Sumatra, Sumbawa. 
Bingham says: “this form is subject to much seasonal 
variation. ‘The type in the British Museum is a ee 
intermediate between the wet and the dry season broods, 
which the dise of the fore-wing on the upperside i is much fase 
with a small spot of white in ‘the middle.” 
In Borneo the se asons are not very definitely marked: though 
the “landas” or “wet season” sets in about October and 
usually lasts until February or March. An examination of 12 
specimens in the Sarawak Museum shows that the seasonal 
differences cannot be reed on much; thus a typical wet-season 
form was taken in July and another in June and a third in 
May; of the remainder, two taken in April and May have the 
white on the fore-wing of the dry-season but the hind-wing is 
typically wet-season ; only two taken in June and August are 
typical of the dry-season, and the other five taken in January, 
April and October, are typical of the wet-season. Mr. Shelford 
suggests in explanation, “that the colouring of the butterflies 
exhibiting seasonal changes is determined by the state of the 
weather during the early stages of the life-history, so that a 
wet August (for example) would produce the wet-season form, 
a dry August the dry-season form.”? 
I Oe Shelford gives an interesting account on the Dubterfies ae this 
mountain in Journal No. 35. Str. Br. Roy. Asiat. Soc. 1901, pp. 29-42. He 
notices the distinctive character of the fauna of Penrissen as shewn by his 
collections there, and at the same time comments on the unexpected scarcity of 
butterflies as compared with those found on the mountains near Kuching,— Mts. 
Matang and Santubong. His small total of 9 species of Lycaenidae captured in 
one month’s collecting is certainly illustrative of this; and my own experience 
there on a short trip in November 1909 was the same. (Mr. Shelford made his 
expedition there in May 1899.) 
Dig Us Gs Dp BC 
R. A. Soc., No. 60, 1911. 
