140 C. H. TYLER TOWNSEND. 



96. A row of bristles either on the facial ridges their whole length, or on sides 



of face very near ridges 97. 



No such row 98. 



97. Claws and pulvilli of front feet minute Atropliopoda Twns. 



Claws and pulvilli of front feet as long as others Aiigiorliiiia B. & B. 



98. Sides of face bristly ; third anteunal joint scarcely longer than second. 



Lioewia Egg. 

 Sides of face bare ; third joint more than twice as long as second. 



Tryphera Mg. 



99. Apical cell short petiolate, or closed in margin"*" 100. 



Apical cell long petiolate 114. 



100. Face perpendicular, or nearly sot (or its plane nearly parallel with plane 



of occiput) 101. 



Face more or less iucliued, either forward or backward 104. 



101. Second aristal joiut elongate, arista more or less geniculate 103. 



Second aristal joint not elongate 10"2. 



102. Apical cross-vein straight or convex, wings short ; proboscis gently curved, 



dark species Epigrimyia Twns. 



Apical cross-vein concave, wings longer; proboscis usually strongly curved, 

 light species Drepaiioglossa Twns. 



103. Labella distinctly enlarged, proboscis straight below geuiculation, only 



moderately slender Sipliopliyto Twns. 



Labella indistinct, proboscis longer and more slender, strongly curved back- 

 ward at tip Corouiiiiyia Twns. 



104. Third autennal joiut short, not more than twice length of second 105. 



Third joint proportionally very much longer, three or more times length of 



second 109. 



105. Sides of face with bristles; arista not distinctly jointed 106. 



Sides of face without bristles; arista 2- or 3-joiiited 107. 



106. Cheeks about one-half eye-hight ; sides of face fringed with a row of bristle.s. 



Clista Mg. 



Cheeks fully two-thirds eye-hight; sides of face with some irregularly 



placed bristles Sarcoclista Twns. 



107. Antennje. inserted below median line of eyes. 



Oestropliasia B. & B. emend. 

 An ten use inserted above median line of eyes 108. 



108. Arista 2-joiuted; head like Hyalomyia, eyes descending very low, epistoma 



prominent, vibrissa inserted well above oral margin; antennsB short, 



second and third joints nearly equal Clistoinorpha Twns. 



Arista 3-jointed ; vibrissje inserted on oral margin, which is not prominent ; 

 anteuniE nearly as long as face, second joint elongate. 



Tachiiiopliyto Twns. 



109. Abdomen of % with a large longitudinally-compressed process on underside 



of second segment C'elatoria Coqll. 



Abdomen normal in both sexes 110. 



"*" Some species of Phyto may have the apical cell rather short ])etiolate, but are 

 included in the next division. 



t Myothyria may have the face moderately perpendicular, but the epistoma is 

 prominent ; it is not included here. 



