436 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 57. 



times with dorsal carinae, without a complete carina from spiracle to 

 apex of segment although it is present apically; second tergite of 

 female with apical width greater than length, ia male about one and 

 one-half times as long as apical width ; tergites granular or somewhat 

 reticulate, opaque ; ovipositor longer than abdomen. Black ; legs more 

 or less rufous; antennae black in both sexes; wings hyalme. 



XOKIDES FRIGmUS (Cresson). 



Xylonomusfrigidtcs Oresson, Trans. Amer. Ent. Soc, vol. 3, 1870, p. 168. 

 Xylonomus (Xylonomus) plesius Rohwer, Proc. IT. S. Nat. Mus., vol. 45, 1913, 

 p. 354. 



Type of frigidus.~C&t. No. 1522, Acad. Nat. Sci. PhU. Tyj)e of 

 plesius: Cat. No. 15365, U.S.N.M. Notes from types. 



In describing plesius it was compared with a specimen determined 

 as frigidus by Ashmead and Viereck, but an examination of the type 

 of frigidus showed that this determination was wrong and that 

 plesius is really a synonym oi frigidus. 



The male of this species is unknown and when it is found it will 

 probably prove to be very closely allied to yulconensis. 



Hudson Bay Territory; United States, 



XORIDES YUKOENSIS (Rohwer). 



Xylonomus {Moerophora) yukonensis Rohwer, Proc. U, S. Nat. Mus., vol. 45, 

 1913, p. 355. 



Type.~C&t, No. 15367, U.S.N.M. Notes from type and from 

 specimens listed below. 



This species is closely allied to frigidus (Cresson) and the character 

 made use of in the table is about the only one. 



Male. — Length 11 mm. Antennae as long as body; very like the 

 female but the sculpture is stronger; propodeal carinae strong, the 

 median ones nearly confluent so the basal area at first sight seems 

 separated from the areola; first tergite with strong complete median 

 carinae. Black; tegulae, four anterior legs and posterior coxae and 

 trochanters rufous. 



A specimen from Sherbrook is slightly larger and has the frons 

 punctato-striate while in the type the frons is punctured. 



Fort Yukon, Alaska; Sherbrook, Canada; Boulder, Colorado 

 (Cockerell). 



Group ALBOPICTTjS. 



Group characters. — Facial quadrangle longer than wide, shining 

 almost impunctate; posterior orbits smooth above, obliquely striate 

 below; postocellar line distinctly longer than ocellocular line; an- 

 tennae of male with short hair; angles of pronotum prominent but 

 hardly toothed; scutum and prescutum shining, sparsely punctured; 

 propodeum sparsely punctured, carinae strong, lateral angles not 

 prominently toothed; basal area and areola confluent, or separated 



