FAMILY TACHIXID.K THE TACHIXIDS 449 



269. Base of wings deep brown; abdomen piceous or largely castaneous 



(4 ) Leschenaultia Desvoidy 



Base of wings never brown; abdomen largely gray pollinose, more or 

 less reddish laterally or apically 270 



270. Apical cell ending far before the wing-tip; large species. .Gaedia Meigen 

 Apical cell ending near the wing-tip; small species. 



*Admontia Brauer & Bergenstamm 



271. Apical cell closed and rather long petiolate 286 



Apical cell open, closed in the margin or extremely short petiolate. . .272 



272. Penultimate aristal segment not over twice as long as wide 273 



Basal two aristal segments each at least three times as long as wide. 



Digonichaeta Rondani 



273. Posterior sublateral bristle very strong 284 



Posterior sublateral bristle absent; face strongly retreating 274 



274. Third abdominal segment with at most two pairs of discals 275 



Third abdominal segment with a row of discals Gibsonomyia Curran 



275. At least the third abdominal segment with discals 276 



Intermediate segments without discals, the marginals rarely simulat- 

 ing discals 279 



276. Both the second and third abdominal segments with discals or the 



marginals not situated far forward 277 



Second segment without discals but the marginals situated far for- 

 ward Paralispidea Townsend 



277. Second antennal segment almost or quite half as long as the third. . .278 

 Second antennal segment not nearly half as long as the third. 



Phyllomya Desvoidy 



278. Cheeks about half as wide as the eye-height. . . .Eubrachymera Townsend 

 Cheeks not one-third as wide as the eye-height Peteina Meigen 



279. Apical cell petiolate 280 



Apical cell open 281 



280. Arista almost wholly thickened Hypertrophocera Townsend 



Arista thin on apical fourth or more (23, 24). . . Ceratomyiella Townsend 



281. Presutural acrosticals present 282 



Presutural acrosticals absent Peteina Meigen 



282. Arista more or less distinctly plumose 283 



Arista bare or practically so, thickened on almost its whole length. 



Hypertrophocera Townsend 



283. First and fifth veins setose Actinochaeta Brauer & Bergenstamm 



First and fifth veins bare Phasiophyto Townsend 



284. Parafacials with fine hairs only 285 



Parafacials with three or more downwardly directed bristles (83, 86). 



Chaetoplagia Coquillett 



285. Intermediate abdominal segments with discals; no orbitals in male. 



fSpathimeigenia Townsend 



* Curran. 1927. Can. Enl., lix. p. 294. 



t Aldrich, 1931, Pr. U. S. N. M., Ixxx, Art. 11, p. 3. 



