FAMILY TACHIXID.E THE TACHIXIDS 457 



380. Pteropleural bristle extending to beyond the apex of the squamag; 



apical abdominal segment of the male very strongly produced. 



Trichodura Brauer & Bergenstamm 

 Pteropleural bristle short as usual; abdomen not cylindrically pro- 

 duced in male Dexia Meigen 



381. Abdomen slender basally, spatulate 384 



Abdomen not spatulate, even though cylindrical 382 



382. Abdomen very slender and not tapering from near the base; costa 



with an extremely strong bristle near the base on the inner side 



(116) Sophia Desvoidy 



Abdomen broader and more tapering; costal bristles short and fine. . .383 



383. Abdomen metallic blue (147, 177) Zuanalia, n. g. 



Abdomen black in ground color (128, 131) Zelia Desvoidy 



384. Lower squamal lobe very small Eucordyligaster Townsend 



Lower squamal lobe large as usual *Cordyligaster Macquart 



385. Vibrissal angles not unusually prominent, if situated high above the 



oral margin the facial depression is not deeply sunken below; head 

 not twice as high as long, or if so the face strongly retreating. . . .386 

 Vibrissal angles high, the facial depression carried far below them at 

 a much lower level; head twice as high as long; presternum 

 swollen Ormia Desvoidy 



386. Posterior pair of presutural acrostical bristles situated very close to 



the suture and much behind the posterior pair of presutural dorso- 



centrals; always three pairs of presutural dorsocentrals 387 



Posterior pair of presutural acrosticals situated but little behind the 

 posterior presutural dorsocentrals, or there are but two pairs of the 

 latter; presutural acrosticals sometimes absent 422 



387. VibrissEe at most half the length of the second antennal segment above 



the anterior oral margin 392 



Vibrissse situated high above the oral margin 388 



388. Antennae reaching at least to the lowest third of the face, the second 



segment not nearly as long as the third; vibrissas only moderately 



above the oral margin 389 



Antennae unusually small, the second segment almost as long as the 

 third; vibrissje situated very high above the oral margin (6). 



fAtacta Schiner 



889. Abdomen without discals 390 



Abdomen with discals Meigenia Desvoidy 



390. Parafrontals with numerous hairs on the anterior half 391 



Parafrontals with but few hairs on the anterior half. 



^lasiphya Brauer & Bergenstamm 



391. Oral margin carried rather strongly forward below the vibrissse. 



JSiphosturmiopsis Townsend 

 Oral margin not conspicuously produced .Sturmia Desvoidy 



* Aldrich, 1927, Journ. Wash. Acad. Sci.. xvii, p. 85. 

 t Aldrich, 1925, Pr. U. S. N. M., Ixvi, Art. IS, p. 29. 

 t Reinhard. 1931. Pr. U. S. N. M., Ixix, Art. 11, p. 9. 



