456 AMERICAN HYMENOPTERA. 



Apaihus insularis Cresson, Syn. Hym. No. Amer., 1887, p. 307 

 (Catal.). 

 Provancher, Addit. Faun. Can. Hym., 1888, p. 343, 

 n. S, 9. 

 Psithyrus " Ant. Handlirsch, Ann. Naturh. Hofmus. Wien., Ill, 

 1888, p. 248 (pars.). 

 interruptus Dalla Torre, Cat. Hym., X, p. 569 (pars?), 



1896. 

 insularis K?,\iTa.QQ.A., Proc. Wash. Acad. Sci., IV, 1902 (May 

 29), p. 130 (pars.). 

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

 " Swenk, Ent. News, XVIII, July, 1907, p. 297, n. 3. 

 " Viereck, Can. Ent., XXXVI, p. 100, April, 1904. 

 " Cockerell, Bull. Amer. Mus. Nat. Hist., XXII, Arti- 

 cle XXV, Dec. 17, 1906, p. 453, n. 109. 

 Cockerell, Trans. Amer. Ent. Soc, XXXII, 1906, p. 

 312. 

 " Viereck, Trans. Amer. Ent. Soc, XXIX, 1903, p. 



45. 

 " Viereck, Trans. Amer. Ent. Soc. , XXXII, July, 1906, 



pp. 238, 240 and 242. 

 " Morrill, Can. Ent., XXXV, 1903, p. 225 (with draw- 

 ings showing structural characters) . 

 interruptus Fletcher and Gibson, Can. Ent. Rec. (Ann. 



Rep't Ent. Soc. Ont.), 1907, p . 17. 

 insularis Cockerell, Can. Ent., XLII, 1910, p. 25. 



Type. — The type female of this species, described as Bom- 

 bus interricptus by Greene, is apparently lost. Smith's insu- 

 laris is probaby in the collection of the British Museum, 

 though Col. Bingham was unable to locate it for me. 



Face usually with more or less yellow pile between and above the bases 

 of the antetmc^ ; occiput with much yellow pile ; dorsum of thorax yel- 

 low, but with a black interalar band or at least the disc black ; pleura 

 mostly yellow to the bases of the legs ; dorsum of abdomen black, with 

 more or less yellow on the sides of the third, fourth and fifth segmefits , 

 and sometimes a little on the hind corners of the second. Vetiter and 

 legs dark. Malar space rather long. Hind m,etatarsi narrow for their 

 length. 



Female. Head. — Face usually with considerable yellow pile above, 

 and usually with a distinct tuft of yellow between, the bases of the an- 

 tennae, but sometimes almost entirely dark ; occiput with a large tri- 

 angular patch of pure yellow pile ; cheeks dark. Mandibles (fig. 46) 

 sometimes with apical margin entire and sometimes with a notch in 



