16 



MR. E. WALKER ON DIPTERA COLLECTED AT 



capite antico rufo, oculis albo marginatis, antennis rufis, arista nuda, 

 thorace vitta lata cinerea, abdoraine basi fulvo, coxis femoribusque 

 anticis fulvis, alis cinereis vitta fasciisque duabus exterioribus nigris. 

 Male and Female. Bluish black; head black, red in front, white about 

 the eyes ; antennae red, not reaching the epistoma ; 3rd joint rather 

 long, slightly tapering to the tip ; arista bare ; thorax with a broad 

 cinereous stripe ; pectus cinereous ; abdomen linear, black, tawny 

 towards the base, broadest in the female and with a prominent ovi- 

 duct ; legs black ; fore coxae and fore femora tawny ; wings cinereous, 

 with a black stripe extending from the base along the costa and thence 

 descending to the middle of the disk ; two exterior black bands, which 

 are united on the costa, the second apical ; discal transverse vein 

 straight, parted by one-third of its length from the border, and by 

 more than its length from the praebrachial transverse. Length of the 

 body 2i lines ; of the wings 4£ lines. 



52. Ortalis concisivitta, n. s. Mas. Rufa, oculis albo marginatis, 

 scutello, metathorace, pectoris disco abdominisque apice cyaneis, alis 

 nigricantibus, margine postico fascia apicibusque cinereis. 



Male. Red, shining ; head white about the eyes ; antennae nearly reach- 

 ing the epistoma; 3rd joint long, linear; arista simple; scutellum, 

 metathorax, disk of the pectus and abdomen towards the tip blue ; 

 abdomen conical, not longer than the thorax ; wings blackish, cine- 

 reous along the hind border and towards the tips, which are blackish ; 

 a cinereous band between the transverse veins ; veins black ; discal 

 transverse vein straight, upright, parted by less than one-fourth of its 

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

 praebrachial transverse. Length of the body 2\ lines ; of the wings 4£ 

 lines. 



Gen. Trypeta, Meigen. 



53. Trypeta retorta, n. s. Fcem. Picea, subtus testacea, capite, 

 scutello abdominisque basi testaceis, pectoris disco piceo, femoribus 

 anticis tibiis tarsisque testaceis, alis limpidis nigricante angulatim 

 bivittatis. 



Female. Piccous setose, testaceous beneath ; head and antennae testa- 

 ceous, the latter not reaching the epistoma, 3rd joint linear ; arista 

 plumose ; scutellum testaceous; disk of the pectus piccous ; abdomen 

 ovate, testaceous towards the base, a little longer than the thorax; 

 tercbra flat, conical ; tibia:, tarsi and fore femora testaceous ; wings 

 limpid, with a blackish costal stripe, which is broadest at the base and 

 Concave towardl the tip, and is nearly parallel to another blackish 

 stripe ; the latter is also broadest at the base, and forms a right angle 

 Opposite the concavity of the fore stripe ; discal transverse vein oblique, 

 Hearty Straight, parted by one third of its length from the border, and 



by ;i little leti than iti Length from the praebrachial transverse. Length 

 of the body 4 lines; of the wings 8 lines. 



