330 Annals Entomological Society of America [Vol. XII, 



the arculus, the third at the tip of Sci and the origin of Rs, the last being 

 the stigmal blotch; wing-apex darkened; large, pale brownish gray clouds 

 along the cord, outer end of cell 1st Mi and at the ends of the longitudinal 

 veins; veins dark brown. Venation: Sc short, Scx ending opposite or 

 slightly beyond the origin of Rs, Sci lacking; a supernumerary cross-vein 

 at about midlength of cell Sc, located in the second anterior brown 

 blotch ; Rs about two and one-half times as long as the basal deflection of 

 i?4+5; cell 1st M2 closed; basal deflection of Cui, before, at or slightly 

 beyond the fork of M. 



Abdominal tergites dark brown, the stemites paler brown. Male 

 hypopygium with the ninth tergite broad, the caudal margin gently 

 concave. Ninth pleurite short; ventral pleural appendage pale, the 

 proximal face produced into a stout beak, set with two widely separated 

 spines, one subapical, the other basal. Gonapophyses a little longer 

 than half the length of the penis-guard, slender and gently curved. 



Habitat: Japan. 



Holotype, d', Meguro, Tokio, October 20, 1919, (R. 

 Takahashi) . 



Allotopotype, 9 , July 9, 1919. 



Paratopotypes, 4cf's, October 20-21, 1919; 19, 1 sex 

 uncertain, July 12, 1919. 



One paratype bears the label, "This insect was flying about 

 over a stream. " 



Antocha Osten Sacken. 



Proantocha, subgen. n. 



Antennae short, the flagellar segments oval, the terminal segment 

 nearly as long as the preceding two taken together. Head very small, 

 broad, the small eyes protuberant, widely separated both above and 

 below. Thorax very large, the mesonotum convex. Halteres short. 

 Legs very stout, the fore and middle legs covered with conspicuous 

 long erect hairs, the posterior tibiae with numerous tiny black spines; 

 the coxae, especially the posterior ones, very large and globular, the hind 

 trochanters being long, narrow, compressed; hind legs very long, 

 especially the tibia, which is slightly curved before its tip ; at the base on 

 the ventral face a long, slender spine which meets a similar but stouter 

 tubercle located near the apex of the femur; tarsi remarkably shortened, 

 especially those of the hind legs where they are less than one-fourth 

 the length of the tibia; claws long and straight, at about mid-length 

 with a long straight tooth that is about two-fifths the length of the 

 apex of the claw alone, an additional tiny basal tooth. Venation as in 

 the subgenus Antocha. Abdomen short. 



-"to"- 



Type of the subgenus — Antocha {Proantocha) spinifer sp. n. 

 (Japan). 



