ART. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 17 



Mesostenus levcocoxus Ashmead, Proc. U. S. Nat. Mus., vol. 12, 1890, p. 407. 



male. T/zpc— Cat No. 2019, U.S.N.M. 

 Mesostcnoidcus albomaculatus (Crcsson) Ashmead, Proe. U^ S. Nat. Mus., vol. 



23, 1900, p. 45. 

 Polycyrtus albomacxilatux (Cres-son) ViiniECK, Proc. U. S. Nat. Mus., vol. 42, 



1012. p. C)44. 

 McsostcnidCit iPolijcijrius) albomaculata (Cresson) Viereck, Hym. Conn., 



(1916) 1917, pp. 329 and 330. 

 Listrognathus alboinaculatus (Cresson) Cusiiman, Journ. Wash. Acad. Sci., 



vol. 15, 1295, p. 391. 

 Listroffuathus Jcucocoxus (Ashmead) Cushman, Journ. Wash. Acad. Sci., vol. 



15, 1925, p. 391. 



Discussion based on type, a specimen compared with the type by 

 the writer, type of leucocoxus, and nine other females and two other 

 males. 



Female. — Length, 8-12 mm. 



Temples and vertex behind ocelli sharply sloping, densely and 

 coarsely punctate; frons medially irregularly rugose; face medially 

 rugose punctate; inner orbits and malar space finely coriaceous and 

 sparsely punctate; eyes parallel; malar .space about three-fourths 

 as long as basal width of mandible, occipital carina very prominent 

 below; clypeus very prominent; antennae nearly as long as body, 

 fourth flagellar joint three-fourths as long as third. Thorax coarse- 

 ly, mostly confluently punctate, pronotum laterally and mesopleurum 

 above striately rugose; scutellum subpolished, sparsely punctate; 

 propodeum reticulate rugose ; apical carina obsolete medially, apophy- 

 ses prominent. Basal tergites punctate, postpetiole coarsely and 

 rather sparsely so, second coarsely and confluently so; apical tergite 

 polished, impunctate; sheath hardly half as long as abdomen; ovi- 

 positor stout, compressed, depressed beyond dorsal angle. 



Black with whitish markings as follows : Orbits except behind top 

 of eyes; usually tAvo small spots on middle of face, sometimes want- 

 ing and sometimes confluent; clypeus basally; spot on upper margin 

 of mandible; broad, ventrajly incomplete, annulus, centering about 

 on joint 8 or 9 of flagellum and usually a spot on under side of 

 scape; anterior and humeral margins of pronotum, median sp()t 

 on mesoscutum; scutellum largely and postcutellum ; tegulae; subalar 

 tubercle; a large mark below on mesopleurum; upper division of 

 metapleurum; a large longitudinal mark on each side of posterior 

 face of propodeum including the apophyses; and apical bands on 

 tergites 1-6, those on 2 and 3 not interrupted laterally, extreme apex 

 of 2 narrowly black; wings yellowish hyaline, sometimes with a 

 faint trace of a cloud below stigma, venation dark brown; legs tes- 

 taceous; front and middle coxae largely whitish, more or less black 

 at base and sometimes at apex above; hind coxa black with a whit- 

 ish spot above, hind knees black, tibia blackish, pale subbasall}^; 



5927—29 3 



