122 NOETII AMERICAN DIPTEIJA. 



15. Cross-veins conspicuously approximated 16 



Cross-veins not approximated. ....... 17 



10. Wings witli hyaline indentations and a subapical, arcuate, hyaline 



cross-band; scutellum bhick. . . Polymokphomyia Snow. 



Wings with three brown bands or projections, connected anteriorly, 



the distal one following the costa, the middle one beyond the middle 



of the wing, the proximal one toward the base. CEdaspis Loew. 



17. Scutellum with four bristles, yellow ; wings with black cross-bands. 



Khagoletis Loew. 



Scutellum with two bristles, black; wings with hyaline indentations 



along the margin Aciura Desvoidy. 



18. Fifth vein strongly bristly ; scutellum with six bristles. 



Blepharoneura Loew. 

 Fifth vein not bristly ; scutellum with four or two bristles. . 11) 



19. Wings banded on the apex. .... Acrot.^nia Loew. 

 Wings not banded on the apex. ....... 20 



20. Face spotted • . 21 



Face not spotted. 22 



21. Wings very much dilated; pattern of picture not radiating. 



Eutreta Loew. 

 Wings not dilated; with radiating markings along the margin. 



Carphotricha Loew. 



22. Front very broad. ......... 23 



Front not very broad. .25 



23. Third antenna! joint elongate, with a sharp anterior angle; ovipositor 



flattened Acidogona Loew. 



Third antennal joint short. ........ 24 



24. Wings with numerous small spots and larger ones iilong the distal mar- 



gin; ovipositor conical. ..... Kiuosta Loew. 



Wings with large, irregular, brown spots and hyaline spaces, 



Xknocii.kta Snow. 



25. Wings without markings, or, on the apical half only with a reticulation 



dissolved into cross-bands. . Neoaspilota Osten Sackeii. 



Flies not having the above charactiTs. ..... 2(i 



2G. Wings of an evenly broad shape, and with an unusually blunt apex. 



ICTERICA Loow. 



Wings of the usual shape, or dilated 27 



27. Labella very much prolonged Ensina Desvoidy. 



Lalu'lla not or hut little elony-ated 28 



