476 AMERICAN HYMENOPTERA. 



I will here give the name Psithyrus quadricolor var. con- 

 finis, new name, to the variety of Psithyrus quadricolor which 

 Schmiedeknecht (Apid. Europ., 1882-1884, p. 407) called aVrz- 

 nus, the name citrinus having been preoccupied by Smith's 

 species (Catal. Hymen. Brit. Mus., II, 1854, p. 385, n. 7), 

 which I have classed as the male of laboriosus (F.). 



Psithyrus tricolor Franklin. 



Apathus itisularis Cresson, Proc. Ent. Soc. Phila., II, 1863, p. 113, 



c?, var. c. (Probably misidentification.) 

 ? Psithyrus " Ashmead, Proc. Wash. Acad. Sci., IV, 1902, p. 130 



(pars). 

 ? " " Ashmead, Hym. of Alaska, 1904, p. 136 (pars). 



tricolor Franklin, Trans. Amer. Ent. Soc, XXXVII, 1911, 

 p. 167, &. 

 Readily identified by its group characters. 



Types. — Described from thirty cotypes, which are deposited 

 in the following collections : United States National Mu- 

 seum, Massachusetts Agricultural College, Museum of Brook- 

 lyn Institute, New Hampshire College, Entomological So- 

 ciety of Ontario, Leland Stanford Jr. University, Colorado 

 Agricultural College, American Entomological Society, and 

 the private collections of Mr. J. C. Crawford, Prof. T. D. A. 

 Cockerell, Mr. P. G. Bolster, Boston, Mass., and Mr. H. L. 

 Viereck. 



Female. — I believe that fernaldcs is the female of this species. See 

 the discussion under fernaldcB. 



Male. Head. — Face black, sometimes with a touch of yellow pile 

 above the bases of the antennae ; occiput with a triangular patch of 

 yellow pile; cheeks dark. Malar space nearly as long as its width 

 at the apex, nearly one-fourth as long as the eye. Clypeus clothed 

 with black pile. 



Thorax. — Dorsum yellow, with a usually poorly defined black band 

 between the bases of the wings, or at least with a large black spot on 

 the disc (when a distinct band is present, it usually extends back, in 

 the middle, onto the middle of the scutellum); mesopleura usually 

 covered with yellow pile to the bases of the legs, but sometimes with 

 their lower portions dark ; metapleura sometimes dark and sometimes 

 yellow, but usually with considerable yellow pile ; sides of the median 

 segment sometimes entirely dark, but usually with considerable light 

 pile admixed. 



