242 NORTH AMERICAN ANTHOMYIID FLIES OF GENUS PHAONIA 



21. Palpi blackened apically; fourth wing- vein slightly curved forward at 



apex; basal abdominal sternite bare; tarsi black .... erratica Fallen'' 



— Paipi fuscous; fourth wing-vein not curved forward at apex; third an- 



tennal segment black; abdomen with golden pollinosity. 



aurea new species 



22. Tarsi black; hind femur with at least one bristle on jjosteroventral sur- 



face; humeri black rufibasis Malloch 



— Tarsi yellow; hind femur bare on posteroventral surface; humeri yellowish. 



perfida Stein 



23. Legs almost or entirely lilack nigricans Johannsen 



— Legs with at least the tibiae reddish j'ellow 24 



24. All femora yellowish; mid tarsi with the short spines along the antero- 



ventral and posteroventral margins continued to ba.'^es of segments 

 two to four or almost so ... . errans variety completa new variety 



— At least the fore femora largely or entirely blackish; mid tarsi with the 



short spines on segments two to four confined to apical halves 25 



25. Fore femora largely and mid femora rarely partly ])lackened. 



errans ^leigen 



— All femora largely blackened varipes Cocjuillett 



26. Thorax with three pairs of postsutvu'al dorsccentral bristles; hind femur 



in male with long setulose hairs on basal half of ventral surfaces and a 

 series of long bristles on apical half of anteroventral. 



subfusca new species 



— Thorax with four pairs of postsutural dorsocentral bristles; hind femur 



not as above 27 



27. Hind femur of male with long hairs on almost the entire length of postero- 



ventral siu'face; antennae and palpi partly black; tarsi black. 



quieta Stein 



— Hind femur without long hairs on po.steroventral surface; antennae and 



palpi black, if partly yellow the tarsi are black or the fourth tergite of 

 abdomen is partly j^ellowish apically 27 



28. Eyes not very widely separated, the frons at narrowest part not wider than 



third antennal segment; tarsi and humeri yellowish; hind tibia with 

 only the calcar on pester odor sal surface perfida Stein 



— Eyes separated at narrowest part of frons by much more than width of 



third antennal segment; hind tibia with a bristle basad of the calcar 

 on posterodorsal surface 29 



29. Tarsi and apex of fourth abdominal tergite yellowish; hinil femur of male 



with an irregular double series of short black bristles on apical half of 

 posteroventral surface; hind tibia of male with long hairs on postero- 

 ventral surface deleta Stein 



— Tarsi and entire body black; hind femur of male without liristles and 



hind tibia without hairs as above soccata (Walker) 



* This species does not occur in this country so far as I am at present aware. 

 It is inserted in the key because it is the genotype of Phannin and to show its 

 relations. 



