308 Annals Entomological Society of America [Vol. XIII, 



11. Slender species with short and narrow wings; two scutellars, one dorso- 



central; arista densely short black-plumose ....... if ewf/e^op/ery.'v; Cresson 



Wings larger, surpassing the abdomen; four scutellars ... ... ,12 



12. One preapical bristle on hind tibiae; hypopygium moderate, fifth sternite 



simple; hind femora closely spinose beneath; first vein ending beyond 

 anterior crossvein; cheeks at least half as wide as eye. . . .Renocera Hendel 

 Two preapical bristles on hind tibiae; hypopygium enlarged, fifth sternite 

 pointed; first vein ending opposite or before anterior crossvein; cheeks 

 not exceeding one-third the eye Antichceta Haliday 



13. At least meso- and pteropleurae with macrochaetae; face nearly vertical, 



its central part with nearly parallel sides; wings brown, with paler spots; 



eyes vertically oval 14 



No distinct macrochaetae on pleura, sometimes setulae present; face more 

 or less receding and divergent below; 2 reclinate fronto-orbitals 15 



14. Two fronto-orbitals, the anterior proclinate, 1 sternopleural, 3 dorso- 



centrals; second antennal joint with a forcipate pair of stout bristles; 



fourth tergite of d^ narrow ■■•.■■■ .Hoplodictya Cresson 



One fronto-orbital, sternopleural, 2 dorsocentrals; second antennal 

 joint with only ordinary setae; fifth tergite narrow Dictya Meigen 



15. Arista almost bare; hind crossvein strongly bent,. S-like; scattered 



setulae on meso-, sterno- and pteropleurae; wings with few markings; 



lunule visible 16 



Arista pubescent or plumose; hind crossvein sinuous or arcuate; 2 or 3 

 dorsocentrals 17 



16. No vallar bristles, i. e., on callosity beneath calypteres, presutural, 



prescutellar, 1 dorsocentral; extensor femoral bristles weak. 



Hedroneura Hendel 

 Vallar bristles present, 1 presutural, 1 prescutellar, 2 dorsocentrals; 

 front femora bristly above Elgiva Meigen 



17. First vein ending almost opposite anterior crossvein; interfrontal stripe 



depressed and relatively narrow; 2 dorsocentrals; edges of second 



antennal joint nearly parallel 18 



First vein ending far before anterior crossvein; interfrontalia convex, five 

 times as broad as periorbit; 3 dorsocentrals; second antennal joint 

 compressed, obconical, half as long as the scimiter-shaped third joint, 

 arista plumose; all pleural sclerites setulose; wings brown, with 

 rounded clear spots Poecilographa Melander 



18. Meso- and pteropleurae entirely bare, no vallar bristles, only the sterno- 



pleurae setulose 19 



Meso- and pteropleurae as well as sternopleurae bearing setulae, vallar 

 bristles (i. e., on callosity beneath calypteres) present; eyes trans- 

 versely oval; fifth tergite of male wide; lunule covered; wings reticulate. . .21 



19. Lunule exposed; wings brown, with rounded clear spots 20 



Lunule more or less covered; wings nearly uniformly colored, the cross- 

 veins clouded, sometimes with short transverse marks, but no round 

 clear spots; eyes rovind; arista black-plumose; fifth tergite wide. 



Tetanocera Dumeril 



20. Second antennal joint slender, as in Sepedon, much longer than the third; 



eyes vertically oval; arista white-pubescent; wings abnormally wide; 

 fifth tergite d^ wide; face tuberculate beneath antennae. .Dictyomyia Cresson 

 Second antennal joint quadrate and broad, scarcely longer than third; 

 eyes round; arista white-plumose; fifth tergite cf retractile; face 

 carinate just beneath antennae Euthycera Latreille 



21. Arista loosely black-plumose; interfrontal depression not polished. 



Trypetoptera Hendel 

 Arista closely white-pubescent or short-plumose; interfrontal stripe 

 shining Limnia Desvoidy 



