NORTH AMERICAN DIPTERA. 141 



110. Frontal bristles descending on sides of face to lower border of eyes; aii- 



tenuiB elongate 111. 



Frontal bristles descending little if any below base of tbird antennal 

 joint iV2. 



111. Palpi distinct, developed <'t'raloin.vi«'Ila Twns. 



Palpi very small, rudimentary, terminated with a bristle. 



AtropliopalpiiM Twns. 



112. Facial ridges ciliate about to lowest frontal bristles. 



I'seiidoiiiyotliyria Twns. 



Facial ridges not ciliate, with at most a few bristles below which do not 



extend half way up face 113. 



113. Epistoma prominent; arista not distinctly jointyd...]fIj'Ollijria v. d. W. 

 Epistoma not prominent; arista 3-j<)inted Kiiiny4»tliyi*ia Twns. 



114. Sides of face with some strong bristles below near eye margins. 



Kliiiiopliora E. D. 

 Sides of face either bare below, or clothed with hairs 115. 



115. Third antennal joint scarcely longer than second, or one and a half times 



as long 116. 



Third joint at least twice as long as second, but usually many times lon- 

 ger 117. 



116. Tegulse unusually large, wings much lougei- than the rather short abdomen ; 



hind cross-vein in middle between bend of fourth vein and small cross- 

 vein Iieucostoina Mg. 



Tegulse smaller, wings a little longer than the more elongate abdomen ; liind 

 cross-vein usually, but not always nearer to bend of fourth vein than to 

 small cross-vein Pliyto R. D. 



117. Front claws and piilvilli minute (as in Atrophopoda). arista more or less 



hairy Vaiiderwulpia Twns. 



Front claws and jiulvilli as long as others 118. 



118. Face carinate, facial ridges bare Kiilliora Lw. 



Face not carinate. facial ridges usually with bristles extending part way up 



the face 119- 



119. Third antennal joint three to five times as long as second 120. 



Third joint not more than twice as long as second ('estoiiia Edi. 



120. Facial and frontal rows of bri-stles continuous Scopolia R. D. 



Facial ridges bristly less than half way up Eiiseopoliat Twns. 



For the convenience of the student, tlie following list of references 

 to the descriptions of the genera is appended : 



Dejeania Eob. Desv., Myod. 33 (1830) ; Macq., Dipt. Ex. ii, 3, 32. 



Cryptopalpus Edi., Pr. Dipt. ital. iii (1859). 



Hystricia Macq., Dipt. Ex. ii, 3, 43 (1843) ; Cf. Schin., Dipt. Novara, 331. 



Pseudohystricia Br. and Bgst., Muse. Schiz. i, 64 (1889). 



Saundersia Schin., Novara Dipt. 333 (1868). 



Jurinia E. Desv., Myod. 34 (18.30) ; Mcq., Dipt. Ex. ii, 3, 37. 



Atropharista Twns., N. Am. Tachiu. iii, Tr. Am. Ent. Soc. xix (1892). 



Blepharipeza Macq., Dipt. Ex. ii, 3, .54 (1843). 



Belvosia E. Desv., Myod. 103 (1830). 



Echinomyia Dumeril, Expos. Met. Nat. (1798); Schin., Dipt. Austr. i. 423. 



TRANS. AM. ENT. SOC. XIX. JUNE, 1892. 



