ORTALID^E. 119 



7. Face distinctly projecting below ; third antennal joint rounded at the 



end EUXESTA Loew. 



Face retreating ; third antennal joint with a sharp anterior angle. 



CH.KTOPSIS Loew. 



8. Body extremely slender. . . 9 



Body not slender; face carinate. .... SEOPTKRA Kirby. 



9. Front only slightly projecting in profile ; face oblique. 



STENOMYIA Loew. 



Front very much projecting, so that the head is conical and the face 

 nearly horizontal. ..... EUMETOPIA Mac-quart. 



RICHARDIIN^S. 



Mesonotum with bristles in the middle posteriorly only; femora often 

 armed and incrassate; first longitudinal vein bare; posterior angle of the 

 anal cell obtuse; costal vein usually broken just before the termination of 

 the auxiliary vein ; auxiliary and first longitudinal veins closely approx- 

 imated, their tips near together. 



1. Femora all armed with spines. . . .... . 4 



Femora unarmed. .......... 2 



2. Head shaped like a long, somewhat flattened cone. CONICEPS Loew. 

 Head not so shaped. 3 



3. Wings but little developed ; anal cell wanting. STENERETMA Loew. 

 Anal cell present. EPIPLATEA Loew. 



4. Scutellum with two bristles ; third and fourth longitudinal veins nearly 



parallel. . . ...,... ~ . . . o 



Scutellum with four bristles; ocelli remote from the vertex; last section 

 of the fourth vein convergent toward the third (West Indies and 

 South America). . . .-- . ' ; COELOMETOPIA Macquart. 



5. Ocelli more approximated to the vertex ; front not narrowed anteriorly 



(West Indies). . . - . . NEOIDIOTYPA Osten Sacken. 



Ocelli about half way between the vertex and the antennas; front some- 

 what narrowed anterior!}' (West Indies). . . STENOMACRA. 



44. TRYPETID.E. 



Head hemispherical ; face nearly perpendicular in profile 

 or somewhat retreating, without distinct vibrissse. Front 

 broad, bristly on the sides, the lower fronto-orbital bristles 

 situated close to the border of the eyes. Antennae decumbent, 



