DURHAM DIPTERA. 293 



XXXIV. 



29 (30). Eyes round ; antennae long, rounded in front ; palpi 



of the usual length, dilated in front, spatulate; 

 abdomen very short. 



Spathephilus, Beck, {breviventris, Lw.) 



30 (29). Eyes rather long ; antennas with sharp upper corner ; 



palpi dilated through their whole length ; abdomen 

 not unusually short. 



Pselaphephila, Beck, (loewi, Beck.) 



31 (3). Face short ; palpi small, filiform, never with long 



hairs or bristles ; antennas short ; arista bare, or at 

 most pubescent. 



Sub-Family V. — ClidogastriNjE. 



32 (33) (34). Five dorso-central bristles, two humeral, two to 



three sternopleural, one stigmatical bristle. 



Clidogastra, Mcq. (499) 



33 (32) (34). Two to three dorso-central bristles, one humeral, 



one sternopleural, no stigmatical. 



Gymnomera, Rnd. (500) 



34 (32) (33). One pair dorso-central (prasscutellar) bristles, 



no humeral or an extremely weak one, but there is 

 a row of short thickly set black hairs on the fore 

 side of the humerus which is characteristic of 

 this genus ; one sternopleural, and no stigmatical 

 bristle. Cochliarium, Beck. (500^) 



35 (2). Underside of the fore femora with a double row of 



bristles, of the fore tibiae with a single or double 

 row. 



Sub-Family II. — Norellin^e. 



36 (37). Five dorso-central (some of them sometimes rather 



weak), and a humeral bristle present ; the dorsum 

 on the whole well supplied with bristles. 



Norellia, Dsv. (490) 



37 (36). Only one or two pair of dorso-central bristles and no 



humeral bristle; the dorsum on the whole very 



poorly supplied with bristles. 



Achantholena, Rnd. (sp'nzpes, Mg.) 



