16 MR. F. WALKER ON DIPTERA COLLECTED AT 
capite antico rufo, oculis albo marginatis, antennis rufis, arista nuda, 
thorace vitta lata cinerea, abdomine basi fulvo, coxis femoribusque 
anticis fulvis, alis cimereis vitta fasciisque duabus exterioribus nigris. 
Male and Female. Bluish black; head black, red in front, white about 
the eyes ; antennz 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 coxze and fore femora tawny ; wings cimereous, 
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 prebrachial transverse. Length of the 
body 23 lines; of the wings 43 lines. 
52. ORTALIS concisivirTa, 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 ; antennz 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 
prebrachial transverse. Length of the body 2; lines; of the wings 43 
lines. 
Gen. Trypeta, Meigen. 
53. TRYPETA RETORTA, n.s. Foam. Picea, subtus testacea, capite, 
scutello abdominisque basi testaceis, pectoris disco piceo, femoribus 
anticis tibiis tarsisque testaceis, alis limpidis nigricante angulatim 
bivittatis. 
Female. Piceous setose, testaceous beneath; head and antennz testa- 
ceous, the latter not reaching the epistoma, 3rd joint linear ; arista 
plumose ; scutellum testaceous ; disk of the pectus piceous ; abdomen 
ovate, testaceous towards the base, a little longer than the thorax; 
terebra flat, conical; tibiz, tarsi and fore femora testaceous; wings 
limpid, with a blackish costal stripe, which is broadest at the base and 
concave towards 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, 
nearly straight, parted by one-third of its length from the border, and 
by a little less than its length from the prebrachial transverse. Length 
of the body 4 lines; of the wings 8 lines. 
