124 MB. F. WALKEE ON NEW SPECIES^ OF DIPTEEA 



costal streak ; second of eqvial breadth ; third irregular, apical, exca- 

 vated, paler than the others; veins black ; discal transverse vein straight, 

 pai-ted by more than half its length from the border, and by much 

 more than its length from the prsebrachial transverse vein ; halteres 

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



58. Ortalis semivitta. Fcem. Nigra, capite rufo, antennis rufes- 

 centibus, pedibus piceis tarsis fulvis, alis albis vitta costali extus 

 dilatata guttam albam includente fasciaque exteriore strigara costalera 

 emittente nigris, halteribus albidis. 



Female. Black, shining. Head red, whitish about the eyes. Antennae 

 reddish, as long as the face ; third joint lanceolate, four times the 

 length of the second ; arista very minute, pubescent. Abdomen elon- 

 gate oval, acuminated, a little longer than the thorax. Legs piceous ; 

 tarsi tawny. Wings white, vdth a black costal stripe, which widens 

 from the base to half the length, tvhere it concisely terminates ; a 

 white costal dot near the end of the stripe ; an exterior black band, 

 parallel to the end of the stripe, emitting a costal streak to the tip ; 

 veins black ; discal transverse vein straight, parted by less than one- 

 fourth of its length from the border, and by a little more than its 

 length from the prsebrachial transverse vein ; halteres white. Length 

 of the body 2-^- lines ; of the wings 4 lines. 



G-en. Tetpeta, Meigen. 



59. Trypeta diversata, Fcem. Pallide testacea, abdomine ovato 

 brevi, alis nigris longis vitta postica nigricanti subnebulosa lituraque 

 costali cinereis. 



Female. Pale testaceous. Hedd as broad as the thorax ; vertex with 

 some black bristles ; epistoma shghtly prominent. Antennae much 

 shorter than the face ; third joint hnear, about twice the length of the 

 second ; arista bare. Thorax with black bristles on each side. Ab- 

 domen oval, much shorter and a little broader than the thorax. Fore 

 tibiffi with black bristles. Wings black, long; a cinereous stripe along 

 the hind border, partly and slightly clouded with blackish; a minute 

 cinereous costal mark at a little beyond the middle ; veins black ; 

 discal transverse vein straight, parted by hardly half its length from 

 the border, and by much less than its length from the prsebrachial 

 transverse vein. Length of the body 2^ lines; of the wings 7 lines. 



60. Trypeta brevivitta. Fcem. Cinereo-testacea, thorace vittis 

 duabus fuscis, abdomine piceo lanceolato vitta abbreviata albida, 

 pedibus albido-testaceis, alis nigris postice cinereis, halteribus albidis. 



Female. Pale cinereous testaceous ; whitish testaceous beneath. Head 

 a little narrower than the thorax, with some black bristles. Antennae 

 much shorter than the face ; third joint linear, much longer than the 

 second ; arista plumose, with short hairs. Thorax with two slender 

 brown stripes, which are remote from each other; some black bristles 



