On f/ic BniiiliiiHitl l<'<iinia <>f Smith Africa ( Dijitcra). 117 



PTERAULAX, gen. nov. 



The present new genus is very near Cononedys and Aphoebantw ; 

 with them it forms a small group distinct in having no prominent face, 

 separated antennae, united eyes of male, a folded wing membrane, 

 short praefurca, and the second vein originating at an acute angle. 

 In general shape, however, this group agrees perfectly with that of 

 Ple8iocera-Stomylomyiaa,nd.vriih that of Petrorossia-Chionamoeba ; and 

 therefore I place all these 3 small groups ef Becker with Lomatia in a 

 single group of Lomatiinae. 



The structural features of the new genus are as follows : Head 

 nearly spherical, broader than the thorax. Occiput convex and 

 prominent, with a very deep post- vertical furrow, trilobate above ; it 

 is excavated in the middle and destitute of fringe at the border. Eyes 

 bare, of great size, with a very developed indentation in the middle of 

 the hind border and with a well-developed bisection line ; in the male 

 they have the upper inner areolets much broader and are united for 

 a rather long line ; in the female they are broadly separated and have 

 equally small areolets. Ocellar tubercle prominent but small, ovate, 

 with three equidistant ocelli. Face broad, long, not prominent, pilose ; 

 genae very narrow ; chin broad and flat, destitute of long beard. 

 Antennae short, inserted a little above the middle of the eyes ; they 

 are broadly separated at the base, but the first joint shows a pro- 

 tuberance on the inner side by means of which the antennae are 

 approximate ; the hairs of the under side are not tuft-shaped as in 

 Lomatia. The second joint is short and globose ; the third joint is as 

 long as the 2 first joints together, broadened and rounded at base, and 

 narrowed to form a point half as long as the first, which bears at the 

 end a well- developed, bi-articulate style. Mouth-opening of small 

 size, oval ; proboscis very short, shorter than the head, thick, with 

 broad terminal labella ; palpi short and strong, less pilose, bi-articulate, 

 the apical joint ovate, about half as long as the first. Thorax convex, 

 with strong and long praesutural and supraalar bristles, and also 

 with 2 pairs of bristles in front of the scutellum ; metapleurae bare ; 

 squamae rather developed, with short fringe; scutellum developed, 

 with some bristles at hind border. Abdomen of conical shape, in the 

 male very narrow and obtuse, in the female more depressed, broader 

 and acute at end. Male genitalia of great size, rounded, closed ; 

 female genitalia with dense tuft of hairs. Hind border of the 

 abdominal segments with more or less developed rows of bristles, more 

 developed in the female. Legs strong ; hind femora much spiuose 

 beneath ; spicules of tibiae long and thin ; many long spurs at the 



