326 Mr. F. Walker's Characters of i/nchscribed Dlptera 



broad, much dilated hindward ; third narrow, also dilated hind- 

 ward ; fourth costal, joining the third at much beyond half the 

 length of the costa, and extending thence to a little beyond the tip 

 of the wing ; discal transverse vein parted by one-fourth of iis 

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

 the prsebrachial transverse vein ; halteres white. 

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

 South America. 



Oi talis bipars. 

 Nigricante viridis, capite supra antennisque rufis, harum arti- 

 culo 3° longo lineari, pedibus nigris, alis albis nigro-trifasciatis 

 et apice maculatis, vittis 2a 3aque postice obsoletis, la in- 

 complcta, iialteribus pallidis. 

 Blackish-green : head above and antennae red ; third joint 

 of the antennae long, linear ; legs black ; wings white, with three 

 slight black bands and a black apical spot ; first band very in- 

 complete ; second and third obsolete hindward ; discal transverse 

 vein straight, upright, parted by one-fourth of its length from the 

 border and by much more than its length from the praebrachial 

 transverse vein; halteres pale. 



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

 United States. 



Ortalis alternata. 

 Viridi-nigra, nitens, capite rufo apud oculos subtusque testaceo, 

 antennis rufis breviusculis, pedibus nigris, tarsis testaceis 

 apice nigris, alis albis, fasciis tribus strigis duabus costalibus 

 iraculaque apicali nigris, halteribus albis. 

 Greenish-black, shining : head red, testaceous about the eyes 

 and beneath; antennae red, rather short; legs black; tarsi tes- 

 taceous, with black tips ; wings wliite, with three black bands, 

 which are paler hindward ; first and second bands slightly curved ; 

 first extending along the costa to the base of the wing ; a short 

 costal streak between the second and third bands ; another beyond 

 the third band, having behind it a black dot; a black apical spot ; 

 halteres white. 



Length of the body 2 lines; of the wings S\ lines. 

 Cape. 



Genus Trypeta, Meig. 



Trypeta polygramma. 

 Fuscescens, capite cinereo guttis duabus nigris, antennis tes- 

 taceis brevissimis, thoracis vittd anticd, scutelli margine pec- 

 toreque cinereis, abdomine nigro maculis duabus basalibus 



