BY MISS A. E. PROUT. 485 



A somewhat melanic aberration, but not appearing other- 

 wise to differ from the type. Silenusalis is represented in 

 the Joicey collection from Khasias, Malay Peninsula and 

 Sarawak. 



Although the genus Bocana is separated from Adrapsa 

 chiefly by a secondary sexual character, the presence (in 

 Bocana) ur absence i Adrapsa), of a large fold on and behind 

 costa of cf fore wing beneath, it has seemed well to preserve 

 this well-known name provisionally, especially as these sexual 

 characters seem often more fundamental in the Hypeninae 

 than in many of the other Noctuid subfamilies. 



104. Hydrillodes toresalis Wlkr. 



lilcptina ioresalis Wlkr., Spec. Lep. Ins., xix, p. 875, 1859, Sarawak. 



Mt. Murud, November, without exact elevation — 1 cf , 3 9 • 

 Also a cf *nd 9 from the same collection with the data 

 wanting. 



Although the type of toresalis is a 9 ^ the quadrate scaling 

 on segment "2 of palpus, as w'ell as the fact that similar cf 

 and 9 occur together in various parts of the Indo-Australian 

 region (India, Malay* TVninsula, Ceram, New Guinea, etc.) 

 make it almost certain that the sexes are correctly paired. 

 Sir G. Hampson, in his "Moths of India" and in Coll. Brit. 

 Mus. has sunk this species to ahavaUs Wlkr. {Echana 

 ahavalis), from Ceylon, but the two are in reality quite 

 distinct, at once separable by the smaller size and darker 

 coloration of abavalis, as well as by the neuration ; in abavalis 

 SC" is more or less parallel with SC^~*, well removed 

 from SC^ ; in toresalis (^ SC" is parallel with SC, somewhat 

 remote from SC^~^. 

 Iu5. Hydrillodes pterota sp. n. 



cT, 9 , 23-26 mm. 



(f . Antenna subserrate. with bristles nearly twdce diameter 

 of shaft and shorter ciliation. Palpus sickle-shaped, with 

 segment 2 strongly curved, nearly twice diameter of eye, 

 shortly scaled in front; segment 3 long (about three-quarters 

 of 2), with rather long scaling behind, tapering to a point. 

 Fore wing rather short and broad, the proximal half of costa 

 above thickened and bearing a dense tuft of long, down-curved 

 scales, which are very easily disarranged, giving to the 

 proximal half of wing a very unusual appearance. This 



