ISTEUROSIGMA. 247 



Genus NEUROSIGMA. 

 Acontia, Westiv. {nee Horsf.) Cab. Or. Ent. 1848, p. 76. 

 Neurosigma, Butler, P. Z. S. 1868, p. 615 ; de N. Butt. Ind. ii, 1886, 

 p. 150; Moore, Lep. Ind. iii, 1896-99, p. 78. 



Type, N. doubledayi, "Westw., from Sikhim. 



Range. From Sikhim eastward through the hiil-rauges of 

 Assam to Burma. 



<$ 2 • Closely allied in structure and neuration to Doplila (p. 255), 

 but the discoidal cells in both fore and hind wing are comparatively 

 longer ; in the fore wing the lower discocellular is slightly sinuous, 

 not strongly concave, aud in the hiud wing more oblique, also 

 vein 7 is distinctly closer at base to vein 6 than to vein 8. The 

 type of coloration, however, is very distinct from that of any 

 JDojfhla, the ochraceous or white ground-colour being covered by 

 a striking pattern of spots, bars and streaks of black. 



Two forms only are recorded, both occurring within our limits. 



Key to the forms of Neurosigma. 



a. Ochraceous colour on upperside of fore wing 



confined to base of cell and bases of inter- 

 spaces 1, 2 and 4 N. doubledayi, p. 247. 



b. Ochraceous colour on upperside of fore wing- 



extended to termen below vein 4 N. fraterna, p. 248. 



272. Neurosigma doubledayi, Westwood (Acontia), Cab. Orient. Ent. 

 1848, p. 76, pi. 37, fig. 4 $ ; Moore, Lep. Ind. iii, 1896-99, 

 p. 79, pi. 218, figs. 1, 1 a, 1 b, S $ • 

 Adolias siva, Westwood, in Dblday., Westiv. fy Hew. Gen. Di. Lep. 

 ii, 1850, p. 291 ; de N. (Neurosigma) Butt. Ind. ii, 1886, p. 151, 

 pi. 19, fig. 80 <$. 



$ . Upperside white with a faint stramineous tint. Fore wing : 

 basal half of interspace 1, the extreme base of interspace 2, and 

 the lower half of cell extending to a little beyond its apex light 

 orange ochraceous ; three large spots in basal half of interspace 1, 

 three irregular transverse bars across cell with two spots beyond, 

 a discal and a postdiscal transverse series of continuous lunules, 

 the costa, apex, termen and dorsum black ; the costa with a 

 streak of ochraceous at base and two slender white streaks near 

 the apex, dorsum with a postmedial white slender streak. Hind 

 wing : veins 1 a and 1 margined with black ; a series of subcostal 

 transverse bars, two crossing cell, a zigzag discal mark and the 

 terminal third of the wing black, the last with two curved series 

 of white spots. Underside similar, the black markings narrower. 

 Antennae and head black ; thorax and abdomen black, marked with 

 ochraceous and white ; beneath ochraceous white. — $ similar ; 

 differs in the comparatively broader black markings and in the 

 ochraceous colouring at the bases of interspaces 4 and 5 on the 

 hind wing. 



Exp. S $ 84-108 mm. (3'3-4'25"). 



Eab. Sikhim ; through the hills of Assam to Burma, 



