NORTH AMRRICAN DIPTERA. 285 



Described from one si)ec'inion ; Morgantown, W. Va. Bred by 

 Mr. A. D. Hopkins from cocoons of Orgyia leucodigma. Issued 

 October 2d. This species has much the facies of Pluffia, but without 

 the venational characters of that genus. I refer it to Tachina, al- 

 though the vibrissa; are inserted considerably above the oral margin. 

 There are many species of Tachina, Exorlda, Phorocera, Masicera, 

 etc., having a decided Plagla facies, whicli may have to be separated 

 from these genera. They must be left where they are for the present, 

 until further material determines their position 



Tachina teiitlirediiiivora n. sp. 9.— Eyes finnanioii-browu, liare; 

 flout aljout one-third widtli of licad : frontal vitta blackish, golden behind on 

 prongs, hardly one-fourth width of front; two orbital bristles directed forward, 

 posterior frontal bristles strong, auterior ones descending fully half way down 

 sides of face ; facial ridges only a little bristly above vibrissie, wiiich are inserted 

 a little above oral margin ; sides of front deeply golden, face and cheeks silvery 

 white; antenuai and arista nearly black, third antennal joint a little longer 

 than second ; proboscis black, labella brownish ; ])alpi rufous, hardly thickened 

 at tip; occiput silvery or cinereous, thickly clothed with brassy gray hair. 

 Thorax silvery pollinose, with more or less of a golden tinge, with four well- 

 defined, narrow, black vittaj, humeri and pleurse silvery white: scutellum sil- 

 very, slightly golden. Abdomen deep shining black, basal half of segments two 

 to four silvery white pollinose, first segment more or le.ss silvery beneath ; first 

 segment with a median marginal pair of macrochaptse ; second segment with a 

 short discal and subdiscal pair, four stronger median marginal, and a short lateral 

 one; third with a strong marginal row, aud four shorter discal (two on one side 

 and only one on the other) ; anal segment thickly beset with macrochaitfe on 

 apical half. Legs black, front femora silvery white on outside, others very 

 faintly if at all silvery; all tibias with spiny macrocluetfie, those on front pair 

 shorter, claws and pulvilli a little elongate, pulvilli fuscous. Wings grayish 

 hyaline, tegulse white; halteres fu.scous, rufous at base. Length of l)ody, 8 mm. : 

 of wing, 6 ram. 



Described from one specimen ; Ottawa, Can. Bred by Mr. W. 

 Hague Harrington from larva of an unknown saw-fly. Issued July 

 26th. This species also has the facies of Plagla. 



Mawiccra tenthrediiiitlaruiii u. sp: 9.— Eyes light brown, bare ; one- 

 third width of head, face same width, frontal vitta dark brown, more than one- 

 third width of front, two orbital bristles; sides of front brassy pollinose. face 

 and cheeks silvery white: vibrissaj inserted on oral margin, facial ridges bristly 

 fully half way up, not quite to lowest frontal bristles: antennae and arista black- 

 ish, third antennal Joint fully three times as long as .second ; i)roboscis brownish, 

 palpi brown ; occiput .silvery or cinereous, gray hairy. Thorax silvery, more or 

 less distinctly bra.ssy pollinose, with four distinct rather heavy black vittie. hu- 

 meri and pleursE silvery whitish ; .scutellum black, more or less silvery. Abdo- 

 men black, segments two to four pale brassy pollinose, except posterior borders, 

 more or less silvery in places, first segment .slightly silvery below; first two seg- 



TRANS. AM. KNT. SOC. XIX. DKCKMBEK, 1892. 



