120 LIST OF DlPTf:RA. 



North America. 

 DIf. I. TibiiE anticae calcaratse. 



Group 1. 



Corpus mairnum, elongatum, fere nudum. Facies plana. Mys- 

 tax sctis uonnullis pallidis. Antennarum sat loiigic ; articuH lus 

 et 2us suliaquales, 3us longissime fusiformis, loet2o conjunctim 

 pauUo longior. 



D. brunnens. Antennarum articulus 3us subclavatus, arliculis lo 

 et 2o conjiinctim non longior. 



Forks of tbe cubital vein slightly curved, their base opposite 

 the end of the discal areolet. First and second extemo-medial 

 veins proceeding direct to the border; third united to the fourth at 

 some distance from the border. Subanal near the anal on the bor- 

 der. Discal areolet very long, slightly widening outward. 



Type D. Herennius. 



A. Thorax bivittatus. basalis, Tra/A. 



B. Thorax trivittatus. 



A. Femora fulva aut fusca. 



A. AliE fuscae. Herennius, Walk. 



B. Alae limpidffi. . - - . - brunneus, Fahr. 

 fi. Femora nigra. politus, .Say. 



81. Dasypogon basalis. 



Dasypogou basalis, Diptera Saundersiana, Pt. 2, 95. 

 United States. 



82. Dasypogon Herennius. 

 Dasypogon Herennius, Cat. of Diptera, 2, 339. 



