O. C. DAVIS. 



91?, 



Atinetiis •cai'inatilS Prov. {Orthocentrns), Faune ii. 436, % . 

 Atmetus tetrazonaf.us Ashm., Trans. Am. Ent. Soc. xxiii, 204, 9 • 



'J, 9- — 4 mm. Black, with legs and mouth rufous; face, antennae and hind 

 coxje more or less piceous; median portion of abdomen more or less rufo-piceous ; 

 wings hyaline, nervures and stigma brown, areolet large ; abdomen not distinctly 

 compressed ; two basal segments shagreened, rugulose; basal segment with mod- 

 erately prominent carinse, more distinct in % . 



Many specimens from Michigan, Illinois (Dr. Nasou), Canada and 

 Colorado (Ashmead). Types, coll. Quebec Mus. ; tetrazonatus, coW. 

 Ashmead. 



ORTHOCEXTRITS Gravenhorst. 

 (Ichneumon, Europe iii, 358, 1829.) 



Our species, some of the types of which are lost and classed here 

 provisionally, may be separated as follows : 



Face black, with long gray pubescence pilirroiis Prov. 



Face not strongly pubescent. 

 Thorax entirely black. 



Posterior coxse bla(;k or piceous; basal segment of abdomen aciculate, rest 



polished nigricoxus Prov. 



Postei'ior coxae and third abdominal segment pale; two basal segments of 



abdomen finely shagreened iliedialis n. sp. 



Thorax more or less pale beneath. 



Abdominal segments 2 and 3 aciculate and with oblique depressions. 



canadensis Prov. 

 Abdomen without distinct oblique impressions. 



Face yellow trirasciatus Walsh. 



Face black, mouth and clieeks white lucens Prov. 



OrtllOCentruK piliTroiiS Prov., Faune Ent. Can. ii, 434. 



9- — 4 mm. Black, with mandibles, palpi, scape beneath, tegulae and four an- 

 terior coxse and trochanters white ; legs red, most of hind pair more dusky ; face 

 scarcely swollen and covered with long silvery pubescence; wings hyaline, areolet 

 pentangular. 



Provancher's type in the Quebec Museum is so badly mutilated 

 that the species is difficult to place, but it apparently belongs to 

 Cryptinse. The head is very different from that of Orthocentrns. 

 It is placed in this genus only temporarily. 



Orthocentrns nigricoxus Prov., Add. Faune 369, 9 • 



Mnesidacus apicalis Ashm., Trans. Am. Ent. Soc. xxiii, 202, 9 ■ 

 % 9- — 3 mm. Black; legs pale, hind femora and coxse piceous to black; face 

 and scape beneath dark rufous in 9 < lemon-yellow in % ; abdomen black to 

 piceous; basal segment and extreme base of second finely aciculate, rest polished ; 

 wings hyaline, areolet small. 



Specimens from Canada, Illinois (Dr. Nason) and Washington, 

 D. C. (Ashmead). 



TRANS. AM. ENT. SOC. XXIV. AUGUST. 1897. 



