54 Dr. A. S. Packard, Jr's Revision of the 



as broad as the succeeding ones. Colors bright, the scutum of meta- 

 thorax is not distinct. 



Pemphredon and allies have the head nearly cuboidal, the thorax 

 somewhat flattened above, the front of the head hirsute and a little 

 hollowed at the insertion of the abdomen. The scutum of meta-thorax 

 is distinct and ridged. The abdomen is very shortly pedicelled, the 

 pedicel arcuated, and the abdomen, short, oval, acute. The species are 

 black. In the head, antennae and short clypeus they approach Crabro 

 more than Gorytes apparently, and are very dissimilar to the others 

 of the family, but this balaace of characters puts them between Phllan- 

 thinse and Mellinus and Gorytes. 



MeUinus and Gorytes, have the head short again, being less than 

 half as long as broad. Gorytes has a sub-triangular front, thus ap- 

 proaching Crabro. The abdomen is sub-globose, narrowing somewhat 

 behind the middle, the meta-scutum is very distinct and large in both 

 genera. The legs are stouter than previously, abdomen has the first 

 ring long sub-pedicellate, widening towards the end like JEumenes, 

 while the rest of the abdomen is oval. The transition in this form of 

 the abdomen to Crabro is easy, since the first ring in Gorytes if it 

 should be shortened and so coalesced with the rest of the abdomen as 

 Crabro, would assume the triangular form of that genus. In coloration 

 also, and the flattened abdomen, these two genera approach Crabro. 



PHILANTHUS, Fabr. 

 Vespa, in part, Fabr., Syst. Ent. 362. (1775.) 

 Crabro, in part. Rossi., Mant. 1.138. (1792.) 

 Philanthus, in part. Fabr., Ent. Syst., ii, 288. (1793.) 

 Simblepjiilus, Jurine, Hym. 185. (1807.) 

 Anthophilus, Dahlb., Hym. Eur. i., 497. (1S45.) 



Synopsis of the Species. 



A. % . Eyes converge very closely on the vertex, making the front 



triangular. 



a. Front not striped. 



9 . Front yellow, not striped with black ; abdominal 



rings yellow; legs reddish P. gloriosus, Cresson. 



b. Front striped vertically with black. 



'k . On second abdominal ring two broad ovate yellow 



fasciae P. Sanbornii, Cresson, 



*£, . On second abdominal ring two narrow acute yellow 



fascise P. frigidus, Smith. 



B. Front densely hirsute. 



9 . Front black above ; scutellum and postscutellum yel- 

 low, abdomen with five continuous stripes P. laticinctus, Cresson. 



