448 NORTH AMERICAN DIPTERA 



254. Ultimate section of fifth vein less than half as long as the pi'eceding 



section 261 



Ultimate section of fifth vein or its fold more than half as long as 

 the preceding section 255 



255. Parafacials with one or more downwardly directed bristles 256 



Parafacials with only short hairs 260 



256. Pteropleural bristle extending to the apex of the squamae 257 



Pteropleural bristle of normal length 258 



257. Posterior crossvein lying wholly beyond the anterior crossvein. 



Blepharigena Rondani 

 Posterior ci'ossvein situated partly before the anterior crossvein 

 (73, 74 ) Goniochaeta Townsend 



258. Arista short plumose Microchaetina Wulp 



Arista bare 259 



259. Parafacials more than two-thirds as wide as the facial depression. 



Cockerelliana Townsend 

 Parafacials narrow (type Voria neotropica Curran) Vorialia, n. g. 



260. Proboscis long and slender; first vein setulose (69, 79). 



Plagiomima Brauer & Bergenstamm 

 Proboscis short and stout; first vein bare Metaplagia Coquillett 



261. Face strongly carinate, the arista plumose 262 



Facial carina weak or absent; arista bare to plumose 263 



262. Apical cell closed and petiolate Hesperodinera Townsend 



Apical cell open (119, 124, 125, 133) *Rhynchiodexia Bigot 



263. Facial ridges never strongly bristled on the lower half, if almost so 



the bristles becoming weak above 271 



Facial ridges strongly bristled on lower half or more 264 



264. Third antennal segment usually less than three times the length of 



the second; face only moderately retreating below; usually over 



9 mm. in length; posthumeral bristle always strong 26S 



Third antennal segment more than four times as long as the second, 

 or if not the posthumeral bristle weak or absent; face very strongly 

 receding 265 



265. Apical cell long petiolate Eleodiphaga Walton 



Apical cell open or very short petiolate 266 



266. Parafacials much narrower than the facial depression. 



fAdmontia Brauer & Bergenstamm 

 Parafacials as wide as the facial depression 267 



267. Fifth vein setulose Actinochaeta Brauer & Bergenstamm 



Fifth vein bare Baumhaueria Meigen 



268. Penultimate aristal segment less than twice as long as wide 269 



Penultimate aristal segment at least three times as long as wide (87). 



Chaetogaedia Brauer & Bergenstamm 



Curran, 1930, Bull. Amer. Mus. Nat. Hist., l.xi, p. 93. 

 Curran, 1927, Can. Ent., lix, p. 294. 



