164 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



deum and metapleura, all longitudinal carinae but only apical transverse 

 carina present, latter very strong and very close to apex, petiolar area very 

 short; spiracle very near base; legs long, slender, hind basitarsus nearly as 

 long as rest of joints combined; wings large, reaching to apex of abdomen, 

 areolet oblique quadrangular, first abscissa of radius straight, second de- 

 curved; stigma lanceolate, radius originating in middle; nervellus broken 

 below middle, brachiella more or less developed; abdomen petiolate, first 

 tergite very narrow, nearly cylindrical, barely wider at apex than at base, 

 slightly decurved, spiracles prominent, slightly before middle; tergites 

 beyond first in female suddenly much wider, in male gradually wider, 2-4 

 with distinct lunulae and 2 with large thyridia; ovipositor nearly as long 

 as body, compressed. 



Type. Diacritus muliebris (Cresson). 



Diacritus muliebris (Cresson). ' 



Mesoleptus (?) muliebris Cresson, Trans. Am. Ent. Soc., II, 1868, p. 102, cf 



Mesostenus rufipes Provancher, Nat. Can., VII, 1875, p. 263, 9 . 



Mesoleptus rufipes Provancher, Nat. Can., XI, 1879, p. 226. 



Echthrus pediculatus Provancher, Nat. Can., XII, 1880, p. 99, 9 . 



Mesostenus pleuricinctus Provancher, Addit. Faun. Ent. Can., Hym., 

 1886, p. 76, 9. 



Euxorides (?) pediculatus Provancher, Davis, Proc. Ac. Nat. Sci. Phil., 

 1894, pp. 184-190. 



Diacritus rufipes Provancher, Davis, Can. Ent., XXVII, 1895, pp. 288-289 

 (=? Mesoleptus muliebris Cresson). 



Diacritus rufipes Provancher, Dalla Torre, Cat. Hym., Ill, 1902, p. 770 

 (=? Mesoleptus muliebris Cresson,) ( = ?Mesoleptus variabilis Provan- 

 cher, 1875 not 1882). 



Diacritus rufipes Provancher, Viereck, Bui. 83, U. S.Nat.Mus., 1914, p. 43. 



Plectiscidea (Aperileptus?) contentionis Viereck, Conn. State Geol. & Nat. 

 Hist. Survey, Bui. 22, part III, 1916, p. 276, 9 . 



A review of the above synonymy shows that the species has 

 been described under five specific names, and referred to six 

 genera representing five tribes and, including the original placing 

 of Diacritus, all five of the subfamilies of the Ichneumonidse. 



Description from types of Cresson and Viereck species, Rohwer 

 homotype of Provancher species, and other material of both sexes. 



Female. Length 7 mm.; antennae 6 mm.; ovipositor 3 mm. Head and 

 thorax, except metapleura and propodeum, polished, nearly without sculp- 

 ture; face about two-thirds as long as wide, obscurely shagreened but shin- 

 ing; clypeus nearly twice as broad as long; malar space two-thirds as long 

 as basal width of mandible; metapleura and propodeum, except petiolar 

 area, roughly coriaceous, petiolar area polished; abdomen, including first 

 tergite shagreened, subpolished apically; first tergite without dorsal cari- 



