Fossori'al Hymen opt era of North America. 55 



%. Front entirely yellow, densely white pilose, as is 



thorax P. albopilosus, Cresson. 



C. % . Eyes indented; front very broad and short, abdominal rings 

 constricted. 



a. Abdomen smooth, highly polished, icith lunate bands. 

 %. Front entirely yellow ; on second abdominal ring a 



single broad band; two dots on the basal ring P. lepidus, Cresson. 



% . Front black above, with a yellow spot just above the 



antennie; two heavy lunate bands on second and 



third abdominal rings P. pulchellus, Cresson. 



% . Arms of three linear bands, one dorsal, on second 



and third abdominal rings P. politus. Say. 



9- Body unusually white pilose, two lateral dots on se- 

 cond abdominal ring P. Bimillimus, Cresson. 



9- Two broad bauds on the second abdominal, on third, 



a single band P. dubius, Cresson. 



J. Small, second abdominal ring unspotted, third ring 



with two regular broad lunate separate fascia?. ...P. bilunatus, Cresson. 



b. Cerceriform species ; abdominal rings being constricted, body coarsely 

 punctured, with very broad single abdominal bands. 



% 9- Large and stout, basal yellow band dislocated, 



mandibles yellow p. ventilabris, Fabr. 



%. Slenderer than the preceeding, a basal band, mandi- 

 bles black p. frontalis, Cresson. 



^ 9- Smaller, no basal band, on second and third ring 

 a single broad band, posteriorly to them very nar- 

 row linear P. punctatus, Say. 



9. Abdomen with unusually broad fasciae, two basal 

 pairs separate, those posterior united and cover- 

 ing nearly the entire ring ; beneath almost entirely 

 yellow, with a large yellow spot on each side of 

 the propodeum P. flavifrons, Cresson. 



9 ■ Like the preceeding, but the propodeum is black, 

 and the abdominal bands behind third ring nar- 

 rower P. albifrons, Cresson. 



In the first group (A) the head is scarcely as broad as the thorax, 

 antenna more filiform, not abruptly clavate; propodeum and the abdo- 

 men much broader than in the succeeding two sections; the abdomen 

 is smooth and polished and the wings are scarcely constricted. 



Philanthus gloriosus, Cresson. 



P. glorioaus, Cresson, Proc. Ent. Soc. Phil., Vol. 5, p. 86. (1865). 

 Colorado Territory, (Coll. Ent. Soc. Phil.). 



Philanthus frigidus, .Smith. 



P. frigidus, Smith, Cat. Hym. B. M. iv., p. 475, %. (1856). 



P. Jrigidt's, Cresson, Proc. v. p. 87. 

 Nova Scotia, (Smith). " Canada West," (Billings, Coll. Ent. Soc). 

 "Dublin, N. H., Leonard," Harr., (Coll. Harr.) Conn., (Norton). 



