250 A. L. MELANDER. 



the subfamily Hybotiuse, presents a habitus much different from 

 that of any of the other members of the group. Both in color and 

 structure it departs from its nearest relative Hybos Fabricius, from 

 which it may be distinguished by the uniformly brown wings, the 

 narrowed first posterior cell, the greatly thickened legs, the smaller 

 number of bristles, the stouter abdomen, the large hypopygium, etc. 



^«-0^4, 111 



From SceloM:^ Philippi * this form may be separated by the 

 two-jointed antennse, longer anal cell, stouter abdomen, shorter and 

 stronger legs, etc. 



From Harpamei'us Bigot f (Ceylon) a close relative apparently; 

 it is generically distinct, in that the spines of the underside of the 

 hind femora arise from the apices of strong tubercles instead of 

 being merely incrassate towards the base. The anal cell seems to 

 be longer, and the whole wing different. 



L,ACTISTOMYIA gen. nov. 

 Robust ; thorax and abdomen densely cov^ered with fine reddish 

 brown tomentum. Antennae very short, two-jointed, the outer joint 

 elongate-oval, slightly longer than the inner joint, with a slender 

 terminal bristle over four times the length of the antenna. Pro- 

 boscis slender, projecting forwards, two thirds the height of the 

 head. Palpi slender, parallel with and shorter than the proboscis. 

 Eyes bare, rufous, contiguous from the antennse to the three ocelli, 

 the upper half consisting of larger ommatidia than the lower. 

 Postocular bristles minute. Thorax globose, very prominent, with 

 no bristles, but with scattered, fine, reddish pubescence, longer at 

 the sides, and almost bristle- like at the margin of the scutelluni. 

 Abdomen robust, cylindrical, deflexed at the tip, twice the length 

 of the thorax, with fine pale hairs along the sides of the segments, 

 longer than those of the thorax. Hypopygium large, deformed, 

 flexed to the right, consisting of a large, very convex, dorsal piece, 

 produced at the right distal corner, and with a marginal fringe of 

 small bristles, and a lengthened, transversely convex, ventral valve, 

 irregularly produced and twisted to the left of the upper projec- 

 tion ; between the two arises the thin compressed, semi-translucent, 

 hastate penis. Legs short, robust, front and middle legs simple, 

 though stout, hind legs remarkably thickened, strongly tuberculate 



* Verb. d. k. k. zool. bot. Ges., Band xv (1865), p. 751. 

 t Revue et Mag. de.ZooL, No. 7 vl859). 



