224 AMERICAN HYMENOPTERA. 



Ortliocentriis mediHlis n. sp. 



9 . — 3 nun. Black, with mouth, scape, orbital spots above antennse, tegulse, 

 legs, third abdominal segment, apex of second and base of fourth, pale or whitish 

 honey-yellow; face and rest of abdomen slightly piceous; antennsp. brownisli 

 red ; wings hyaline, nervuresand stigma paie ; areolet rather small, pentangular; 

 abdomen compressed toward apex ; two basal segments with sides of metathorax 

 above pleurse finely sh agree n ed ; rest of body polished; metathorax distinctly 

 carinate, basal transverse carina wanting. 



One specimen from Algonquin, III. (,Dr. Nason). Type, coll. G. 

 C. D. 



Orthoceiitrus canadensis Prov., Faune Ent. Can. ii. 435. 



% . — 3.5 mm. Black, with lower part of head, more or less of pro- and meso- 

 thorax, tegulse, antennae beneath, apex of abdominal segments two and three and 

 the legs pale yellow, sometimes varied with reddish yellow; abdomen with three 

 basal segments aciculate, more or less rugose, rest subpolished ; segments two and 

 three with distinct oblique impressions as in Glypta. 



Many specimens from Michigan, Illinois and Canada. Type, coll. 

 Quebec Museum. 



Orthoceiitrus arifasciatiis Walsh, Trans. St. Louis Acad, iii, 100. 



•^ J. — 3-4 mm. Black, with lower part of head and scape beneath white; 

 four anterior legs yellowish white; hind legs rufous with coxae, femora and tips 

 of tibise brown in % ; abdominal segments 1-3 clay-yellow at apex ; mesosternum 

 rufous, and in %, most of the pleura also; wings subhyaline, veins and stigma 

 brown, the latter paler, nearly triangular, twice as long as wide ; areolet large, 

 pentangular; metathorax with the usual elongate areas; abdomen finely and 

 rather densely rugose, subpolished toward tip dorsal segment carinate. 



Illinois, two males and one female. Type lost, and hence only 

 provisionally placed in this genus. 



Orlliocenlrns lucens Prov., Faune ii, 43.5. 



9 . — 3 mm. Black, with mouth, cheeks, tegulfe and anterior coxae whitish ; 

 pleurae, legs except apex of hind tibiae, which are dusky, and apical margin of 

 abdominal segments, ferruginous; wings hyaline, nervures and stigma brown, 

 areolet large. 



The type of this species is also probably lost, and hence cannot 

 be placed, except provisionally. 



STENO>nACRrS Foerster. 

 ^Synopsis der Fam. und Gatt. der Ichneumouen, 1868.) 

 Abdomen and metathorax polished ; coxae and femora brownish black. 



iiitritus n. sp. 

 Abdomen at base and metathorax rugose. 



Face piceous; apical half of second abdominal segment polished. 



liastatuN n. sp. 

 Face pale yellow; second abdominal segment entirely rugose. 



stigma tias Walsh. 



