330 Mr. F. Walker's Characters of undescrihed Diptera 



discal transverse vein very far from the border, and parted by 

 more than twice its length from the preebrachial transvere vein ; 

 halteres whitish. 



Length of the body 1| line; of the wings 2| lines. 

 United States. 



Genus Chyliza, Fallen. 

 Chyl'iza nigro-mridis. 

 Fcem. — Nigro-viridis, capite apiid oculos albo, antennis nigris, 

 thoracis tomento cinereo, abdomine lanceolalo, pedibus pal- 

 lida fulvis, alis vitreis, venis testaceis, halteribus albidis. 

 Female. — Blackish-green : head whitish about the eyes ; an- 

 tennae black ; thorax with cinereous tomentum ; abdomen lanceo- 

 late, very much longer than the thorax ; legs pale tawny ; wings 

 vitreous ; veins testaceous ; halteres whitish. 



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

 United States. 



Sub-Fam. GEOMYZIDES. 

 Genus Opomyza, Fallen. 

 Opomyza signicusta. 

 Testacea, capite antico albido, thorace robusto, abdominis ma- 

 culis tribus dimidioque apicali nigris, pedibus albidis, alis 

 sub-cinereis, maculis duabus costalibiis nigricantibus. 

 Testaceous : head whitish in front ; thorax rather stout ; ab- 

 domen with a spot on each side near the base, a dorsal spot, and 

 the apical half black ; legs whitish ; wings slightly greyish, with 

 a blackish spot on the costa near the base, and another at two- 

 thirds of the length ; discal transverse vein straight, parted by 

 twice its length from the border, and by much more than twice 

 its length from the praebrachial transverse, which is near the base. 

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

 United States. 



Genus Drosophila, Fallen. 

 Drosop/iila dorsivitta. 

 Testacea, valida, nitens, vitta abdominali nigra, pedibus albidis, 



alis vitreis, venis testaceis apud costam nigris. 

 Testaceous, stout, shining : abdomen with a black dorsal stripe ; 

 legs whitish ; wings vitreous ; veins testaceous, black along the 

 costa; discal transverse vein straight, parted by less than its 

 length from the border, and by more than twice its length from 

 the praebrachial transverse vein. 



Length of the body 1| line; of the wings 2\ lines. 

 South America. 



