168 



[Jaly. 



OXYETHIRA TRISTELLA, n. up. 

 BY PROF. FR. KLAPALEK, F.E.S. 



Tufts of hair on the face below the anteiiiise silky yellowish, or very pale 



fulrous, except the tips and external 

 hairs, which are black. The hairs on 

 the vertex silky yellowish, and those on 

 the occipital warts mixed with black. 

 Clothing of the pronotum wholly black. 

 The tufts on the shoulders silky yel- 

 lowish mixed with black. Antennce 

 (which are in the S 35- in the ? 25- 

 jointed) show in the <? some variation 

 in colours. The last five joints are 

 always very pale fulvous, almost white ; 

 one of the extreme forms has all other 

 thirty joints black, growing paler from 

 the middle towards the base ; in the 

 other extreme form we find the next 

 four joints black, the two following 

 paler, four black again, and the rest 

 pale with a slight blackish tint ; the 

 different grades of variation being due 

 to the variable intensity of the black 

 colour. In the $ the last five joints 

 are also very pale fulvous, the next three 

 intensely black, and the remaining seven- 

 teen of the same colour as the tip. Palpi 

 pale fulvous ; the external side of the 3rd 

 joint of the maxillary palpi is clothed with 

 black hairs. Legs of the same colour as 

 the palpi, and their femora likewise with 

 black hairs. On the hind-legs are very 



long fringes. Wings black ; at the apex, in 

 the basal third and the middle of the posterior 

 margin, on the triangular spot extending from 

 the middle of the anterior margin towards 

 the middle of the wing (the usual and very 

 characteristic spot in this genus), and on some 

 little spots dispersed on the wing, the hairs 

 are almost wholly white. Posterior wings 

 blackish. Fringes blackish, save where the 

 paler markings intersect them, and slightly 

 bluish iridescent. Neuration arranged in the same manner as in O. costalis. Body 

 blackish, the ventral surface clothed with silky yellowish hairs. 



The lateral margin of the last margin is produced on either side into a stout 

 and long tooth, strongly incurved and acute. The ventral plate is narrow, deeply 



