FAMILY TACHINID.E THE TACHIXIDS 455 



354. Apical cell at most with an extremely short petiole 359 



Apical cell with a petiole almost one-third the length of the apical 



crossvein 355 



355. Antennge shorter than the face, the middle of the face depx'essed; 



vibrissje situated on a level with or above the anterior oral margin. 356 

 Antennae longer than the face; middle of face longitudinally convex, 

 not depressed; vibrissae situated below the anterior oral margin; 

 wings pictured (80, 81) Euthera Loew 



356. Ocellar bristles proclinate 357 



Ocellar bristles directed more or less backward (67, 68). 



Leucostoma Meigen 



357. Third vein ending in the wing-tip; oral margin produced 358 



Third vein ending well before the wing-tip (44, 53). 



Vanderwulpia Townsend 



358. Front of female wide; four pairs of marginal scutellars. 



Psalidopteryx Townsend 

 Front of both sexes strongly narrowed; three pairs of marginal 

 scutellars *Clistomorpha Townsend 



359. Ultimate section of the fifth vein less than half as long as the pre- 



ceding section 360 



Ultimate section of the fifth vein three-fourths as long as the pre- 

 ceding section Catalinovoria Townsend 



360. Penultimate aristal segment not over twice as long as wide 371 



Penultimate aristal segment three times as long as wide, or if some- 

 what shorter, widened apically and the proboscis geniculate 361 



361. Proboscis not geniculate 362 



Proboscis long and geniculate, the labell« turned back, narrow and 



more or less fused (78, 183) fSiphona Meigen 



362. Proboscis, beyond the basal articulation, not as long as the head- 



height 364 



Apical section of the proboscis longer than the head-height 363 



363. Antennas reaching almost or quite to the oral margin; face not reced- 



ing; parafacials at most one-third as wide as the third antennal 



segment (14, 82, 150, 174) Epigrimyia Townsend 



Antennte not reaching to the moderately produced oral margin; para- 

 facials more than half as wide as third antennal segment; face re- 

 ceding above (2) Aphria Desvoidy 



364. Third antennal segment of the male not furcate 365 



Third antennal segment of the male furcate Acronarista Townsend 



365. Third vein with not more than three bristles basally 368 



Third vein bristled more than half way to the small crossvein 366 



366. Bristles of the thorax erect 367 



Bristles of the thorax rather appressed (148, 189) JActia Desvoidy 



* Curran, 1927, Can. Ent., lix, p. 297. 



t Curran. 1932, Amer. Mus. Novit. No. 534. p. 13 (Bucentes). 



i Curran, 1933, Amer. Mus. Novit. No. 614. pp, 1-7. 



