CHEI.OSTOMA. 285 



wings with two submarginal cells nearly equal and a third 

 commenced ; the second receives both the recurrent 

 nervures, the first beyond its commencement and the 

 second before its termination; legs shortish, subsetose, the 

 anterior spurs short, broad, and emarginate at the apex ; 

 the posterior planta with a compact dense brush within ; 

 claw-joint longj claws simple. Abdomen longer than 

 head and thorax, subclavate, convex above, retuse at the 

 base, and the apical segment obtuse at its extremity, the 

 venter flat, its segments clothed from the second with 

 dense parallel brushes of longish hair for the conveyance 

 of pollen. 



The MALE difiers in having the headless, conspicuously 

 globose; the cheeks less protuberant; the whole body 

 more pilose, the anterior spurs robust, short, and abruptly 

 obliquely truncated ; the antenna slender, filiform, much 

 longer than in the female, but not much longer than the 

 head, and from the fourth to the ninth joints serratulate 

 within, adapting it to a sharp curve ; the abdomen being 

 equal, cylindrical, retuse at its base, convex above, and 

 flat on the venter, where it has a longitudinal deeply 

 concave mucro in the centre of the second segment, 

 which concavity runs along all the subsequent segments, 

 and it is densely pilose on the fourth; the terminal 

 dorsal segment being deeply emarginate in the centre 

 and produced on each side into a broad obtuse pro- 

 cess; the claws are more robust than in the female and 

 bidentate ; the posterior pair being subclavate, and their 

 single tooth abruptly reflected. 



NATIVE SPECIES. 



1. floHsomne, Linnaeus, $ ? . 3-5 lines. (Plate 

 XIII. fig. 2 c? ? .) 



