LYCANIDA. ARRHENOTHRIX. 337 
Arvhenothrix differs from Dacalana, Moore, in possessing three subcostal nervules only to 
the forewing instead of four, and the third subcostal arising consequently nearer to the apex 
of the wing. Type, Arrhenothrix penicilligera, mihi. 
As far as I am aware, Arrhenothrix is confined to Assam and the Malay Peninsula, 
but the Dacalana burmana of Moore may belong to this genus, in which case its range 
would be extended to Burma, Mr. Distant records Dacalana vidura, Horsfield, from 
the Malay Peninsula, but I consider it more than probable that that genus does not occur 
in the Straits Settlements, but is replaced by the type species of the genus under notice, 
as I possess asingle male from Selangor, which agrees almost exactly with specimens from 
Sylhet. 
892. Arrhonothriz ponicilligera, n. sp. (PLAre XXVIII, Fic. 214 g). 
folaus vidura (part), Hewitson, Ill. Diurn. Lep., p. 43, Me 10 (1865). 
HapsiraT : Sylhet (AHewitsor), Assam, Malay Peninsula. 
EXPANSE: 6, 1°5 to 1°6 inches. 
DESCRIPTION : MALE. UPPERSIDE, Jo/h wings clear rather pale azure blue. Forewing 
with the costa almost up to the subcostal nervure, the apex very broadly, the outer margin 
decreasingly and ending in a point at the anal angle deep black. Hindwéng with the 
costa broadly whitish, the apex of the wing black, the outer margin bearing a black thread, 
the anal lebe blackish, the abdominal margin whitish. UNDERSIDE, ot4 wings rather pale 
brown, crossed by a narrow pure white band at the middle, beyond which is a narrow 
blackish line broken up into fragments between the veins. Forewing with the inner margin 
broadly whitish, highly polished. A¢zdwing with small whitish marks placed outwardly against 
each section of the narrow blackish line from the costa to the first median nervule, below which 
vein the blackish line is strongly zigzaged and bordered on both sides by a white line ; a sub- 
marginal series of small whitish spots from the costa to the second median nervule ; a small 
rounded black spot in the first median interspace, anteriorly bordered with a broad rust-red 
ring ; the submedian interspace from the discal line to the margin thickly sprinkled with white 
and black scales, which extend into the interspace beyond below the black spot ; anal lode 
black ; ¢az/s black, tipped with white ; ody blue above, ochreous-whitish below. 
My knowledge of this species is confined to four male specimens captured by the Rey. 
Walter A. Hamilton in the Khasi Hills, three of which he has presented to me, and one 
from Selangor in the Malay Peninsula. A. fendced/igera differs from a West Javan specimen 
of Dacalana vidura, Horsfield, kindly given to me by Mr. H. J. Elwes, on the underside of 
both wings in having the ground-colour darker, and the white discal band less than half 
as wide, and its edges more clearly defined, the black spot in the first median interspace 
of the hindwing smaller, with the anterior rust-red lunule smaller and less prominent. The 
female is unknown. 
Mr. Doherty, in writing of this species under the name of D vidura, says that it “has 
the habit of alighting on the underside of leaves (with closed wings), disappearing in the act 
as if by magic. D. vidura is a ground-butterfly, living amongst bushes. Meomyrina hiemalis, 
Godmaa and Salvin, which alights in precisely the same manner, is on the other hand a tree 
butterfly, and rarely descends within reach of the net.” He also notes that 4. pericilligera is 
rare in Assam, but D. vidura is common in the Malayan region. 
Mr. Hewitson, in speaking of D. vidura, says that ‘‘ examples of this species from Silhet 
have the anal angle of the hindwing longer than those brought by Mr. Wallace from Sumatra.” 
This character is not observable as compared with a Javan specimen of that species, but my 
single example from the Malay Peninsula certainly has the hindwing more rounded and 
less produced that specimens from the Khasi Hills. 
The figure shows both sides of the type male specimen from the Khasi Hills in my 
collection. 
43 
