oirrALiD.i:. 119 



7. Face (lis^tiiK'tly proji'ctiiii;' below; thinl anteniial joint roiiiuled at tlic 



end. ......... Ei^XESTA Loew. 



I'ace rctreatinji ; tliird antenna! joint with a sliarp anterior angle. 



Cii.ETopsis Loew. 



8. Body extremely slender. ........ 9 



Body not slender; faee carinate. .... Seoptkh.x Kirby. 



D. Front only .sliijfhtly projeeting in profile; face oblique. 



Stenomyia Loew. 



Front very mueh projecting, so that the head i.s conical and the face 



nearly horizontal. ..... Eitmktopia Macquart. 



RICHAEDIfN.E. 



Mesonotuni 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 

 tlie auxiliary vein ; auxiliary and first longitudinal veins closely ajiprox- 

 imated, their tips near together. 



L Femora all armed with spines. ....... 4 



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



2. Head shaped like a long, somewhat flattened cone. Conicei-s Loew. 

 Head not so shaped. ......... o 



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

 Anal cell present. ...... Epiplatea Loew. 



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



parallel. .".... 5 



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

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

 South America). ..... Coei.ometoi-ia Macquart. 



o. Ocelli more ai)proximated to the vertex; front not narrowed anteriorly 

 (West Indies). . . .' . Neoidiotvpa Osten Sacken. 



Ocelli about half wa^' between the vertex and the antenna'; front .some- 

 what narrowed anteriorly (West Indies). . . Stenomacua. 



44. TRYPETID/E. 



Head heiuispherieal ; I'ace nearly ])ei'pen(liculai' in jiroiile 

 ov somewhat retreating, without distinct vibrissa'. Front 

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

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



