280 LYCAINIDA. ACESINA. 
is tailless. There is a great general similarity in appearance between these two species, but there 
are many differences in detail. I have not seen a specimen of A. chinensis. Mr. Hewitson 
says that A. chinensis is “ very near to A. areste.” I can see hardly any resemblance, except 
that both are tailless. 
845. Arhopala davisonli, n. sp. (FronTisprece, Fic. 135 3). 
Narathura metamuta (part), Distant (sec Hewitson), Rhop. Malay., p. 267,n. 1X0, pl, xxiii, fig. 18, male 
(188s). 
HAapiraT : Mergui ; Myitta, Tenasserim Valley ; Malacca ; Singapore ; Borneo. 
EXPANSE: %, 2, 1'4 to 1°6 inches, 
DESCRIPTION ;: MALE. UpPERSIDE, 6o0¢# wietgs rich but dull dark ultramarine-blue, with an 
extremely narrow outer black border, which in the hindwing is rather broader towards the 
anal angle. Hindwing with the costal margin rather broadly black, the abdominal margin pale, 
“UNDERSIDE, doth wings dull brown, all the markings small, obscure, but well-formed, of a 
slightly darker shade of brown than the ground and margined with grey. Forewing witha spot 
near the base of the cell, a spot at the middle of the cell, and one closing the cell ; the discal band 
regular, even, consisting of six spots forming an angled band, the upper four straight, outwardly 
oblique, the two lower spots parallel to the margin ; a pair of spots below the median nervure 
divided by the first median nervule; the inner margin broadly pale ; the usual obscure marginal 
fascie. Hindwing with a basal series of four small spots arranged across the wing, a subbasal 
series of four larger spots, an elongated spot closing the cell, the usual discal irregular band and 
marginal obscure fasciz ; an elongated patch of verdigris-green metallic scales at the anal angle. 
FEMALE. UPPERSIDE, forewing with the costa narrowly, the apex very widely, the outer 
margin widely black, the rest, equal to rather more than half the surface of the wing, shining 
rather deep bluish-purple. Hixdwing with the costa and outer margin rather broadly black, 
the basal two-thirds of the wing bluish-purple ; the abdominal margin broadly pale fuscous. 
UNDERSIDE, 40th wings as in the male. 
I have but little doubt that this species is the one figured by Mr. Distant doubtfully as a 
variety of 4. mefamuta on the identification of the British Museum. I have much pleasure in 
naming it after Mr. W. Davison, Curator of the Raffles Museum, Singapore, who has fur- 
nished me with seven male and _ six female specimens, which shew no variation, and were all 
taken at Singapore. It is probably nearest to A. hypomuta, Hewitson, diftering from the 
Hewitson’s figures of that species in the colour of the upperside of the male being much 
darker and deeper blue, and in the spots of the underside being perhaps somewhat differently 
arranged, and but slightly darker than the ground, instead of very much darker, as in A. hyfo- 
muta. Julged from Hewitson’s figures, Ad. Ayfomuta also is a considerably broader insect 
than A. davisoniz. Mr. Doherty says that it‘ is one of the commonest and most ubiquitous of 
Malayan insects, and is abundant in Borneo.” 
The figure shews both sides of the type specimen from Singapore in the collection 
of the Raffles Museum, Singapore. 
Genus 131.—ACESINA, Moore. (PLATE XXV). 
Acesina, Moore, Journ. A. S. B., vol. liii, pt. 2, p. 41 (1884). 
“ FOREWING, with the costa less arched than in Panchala, Moore, apex less pointed, 
exterior margin more oblique and waved, fourth subcostal nervule emitted further from the end 
of the third. HtINDWING, not so broad or quadrate in shape, the cos¢a but slightly arched from 
the base, exterior margin more oblique and regularly convex, with a slender ¢a// one-fourth of 
an inch long from the end of the first median nervule, addominal margin shorter. Antennal club 
somewhat shorter. yes naked. Type, A. paraganesa, de Nicéville.”’ (Moore, 1. c.) 
In the forewing the costal nervure terminates on the margin before the apex of the dis- 
coidal cell ; the second subcostal nervule has its origin just midway between the bases of the first 
subcostal and upper discoidal; the third subcostal is short, and has its origin nearer to the 
apex of the wing than of the cell; the upper discoidal nervule is somewhat bent downwards 
just after its origin; middle disco-cellular nervule short, one-third of the length of the lower, 
