FAMILY TACHINID.E THE TACHINIDS 443 



184. Three sternopleurals; face strongly receding-, gently convex in profile; 



abdomen with discals 186 



Sternopleurals 1-1; face receding, not convex 185 



185. Front slightly longer than the face, the antennae arising near the mid- 



dle of the eyes in profile (138, 152) Pelecotheca Townsend 



Front much shorter than the face, the antennae arising near the upper 

 fourth of the eyes in profile (140, 156) Compsilura Bouche 



186. Face strongly receiling; basicosta black 187 



Face gently receding; basicosta yellow (159). . . . Anacamptomyia BischofF 



187. With only two pairs of orbitals in both sexes or the frontal vitta half 



as wide as either paraf rontal 188 



With a row of orbitals in both sexes; frontal vitta narrow. 



Metopiops Townsend 



188. Fourth abdominal segment with discals 189 



Fourth abdominal segment without discals Phaenopsis Townsend 



189. Frontal vitta two-thirds as wide as either parafrontal. 



Paralispe Brauer & Bergenstamm 

 Frontal vitta not half as wide as either parafrontal. 



*ArgyrophyIax Brauer & Bergenstamm 



190. Pteropleural bristle not nearly reaching the apex of the lower squamal 



lobe '. 191 



Pteropleural bristle extending to the apex of the lower squamal lobe; 

 posterior sublateral bristle absent Lypha Desvoidy 



191. Penultimate segment of arista not over twice as long as wide 19.3 



Penultimate segment of arista at least three times as long as wide. . .192 



192. Front with a row of bristles outside of the f rontals . Madremyia Townsend 

 Front without a row of bristles outside the frontals. 



Murdockiana Townsend 



193. Third antennal segment never with more than three branches 194 



Third antennal segment with a large number of branches on either 



side Cryptocladocera Bezzi 



194. Head decidedly more than half as long as high; paraf acials wide or 



the face much wider than either eye, always wider than the front. .195 

 Head half as long as high; parafacials less than half as wide as the 

 elongate third antennal segment; face but little wider than the 

 front, scarcely retreating, its sides parallel on the lower three- 

 fourths (159) Anacamptomyia BischofT 



195. Frontal bristles not extending below the base of the arista 196 



Frontal bristles extending to the middle of the third antennal seg- 

 ment Thrycolyga Rondani 



196. Two or more bristles below the base of the antennae 197 



A single bristle below the base of the antennae Cyzenis Desvoidy 



197. Abdomen of ordinary form, decidedly wider than deep, the genitalia 



usually exposed, at least not enclosed in a slit-like opening 198 



* Curran, 1929, Supiil. to Gowdey's Catalogue Dipt. Jamaica, p. 28. 



