148 Mr. F. Walker's Characters of undescribed Diptera 



Genus Hilara, Meig. 

 Hilara plebeia. 

 Fcem, — Nigra, pedibus anticis ferrugineis, alis limpidis, venis 



stigmateque nigris, halteribus fulvis. 

 Female. — Black ; four legs ferruginous ; wings limped, veins 

 and stigma black ; halteres tawny. , 



Length of the body I5 line ; of the wings 3 lines. 

 United States. 



Genus Rhamphomyia, Hoffmansegg. 

 Rhamphomyia expidsa. 

 Mas. — Nigra, alis cinereis, venis nigris. 



Male. — Black ; hind legs a little longer and stouter than the 

 others ; wings grey, veins black. 



Length of body 1| line ; of the wings 3 lines. 

 United States. 



Rhamphomyia tristis. 



Fcem. — Nigra, thorace cinereo vittis duabus nigris, alis lim- 

 pidis, venis nigris, halteribus albis. 



Female. — Black ; thorax with cinereous tomentum, which is 

 interrupted by two black stripes ; wings limpid, veins black ; 

 halteres white. 



Length of the body 2 lines ; of the wings 4 lines. 



United States. 



Genus Platypalpus, Macq. 

 Platypalpus vicarius. 



Fcem. — Niger, nitens, pedibus testaceis gracilibus subaequalibus, 

 alis limpidis, venis testaceis. 



Female. — Black, shining; legs testaceous, slender, nearly equal 

 in size ; wings limpid, veins testaceous, externo-medial veins very 

 slightly curved. 



Length of the body 1 line; of the wings 3 lines. 



United States. 



