202 WILLIAM J. FOX. 



Maine; Massacliusetts ; New York ; Connecticut (Packard) ; Al- 

 gonquin, Illinois (Nason) ; Ingham County, IVIichigan (Davis) ; New 

 Jersey ; District of Columbia (Ashmead). The S antennae are 13- 

 jointed as far as I can determine, and not 14-jointed as stated by 

 Packard ; and a careful search failed to show the four minute teeth 

 on the hind femora mentioned by Packard. That author was prob- 

 ably deceived by particles of dirt which I find on the femora of his 

 type specimen, giving them the a})pearance of being dentate. 



92. Crabro rufigaster Pack. 



lihopiUnM rufiijanter Packard, 1. c, p. 382, % 9 • 



9 . — Clypeus subcariuatefl, the fore niargiii but slightly and obtusely produced 

 in the middle and without the small lateral tooth as in pedicellatm ; head finely 

 and evenly punctured ; OL-elli in a triangle, the latei'al depressions ou the vertex 

 faint ; frontal depression not so strong or polished as in the preceding species, and 

 the line which extends to the fore ocellus fainter: second joint of flagellum about 

 three times longer than the first, which is not more than half as long as the pedi- 

 cellum; thorax punctured like the head; middle segment without the basal en- 

 closure, the longitudinal impressed line, however, distinct as in pedicellatus, the 

 lateral ridges of posterior face not well developed; legs robust, hut less so than 

 in pedicellatus, the hind tibise serrate and spinose; first abdominal segment as in 

 the preceding species, except that it is slenderer; pygidium not concave, but de- 

 pressed equally : wings hyaline, iridescent, nervures and stigma black. Black ; 

 mandibles and tegulae yellowish testaceous ; scape, pedicellum and first joint of 

 flagellum. tubercles, fore and medial legs entirely, the coxse, trochanters and base 

 of tibife and tarsi of hind legs, pale yellowish ; greater part of abdomen beneath, 

 basal half of third and apical portion of fifth and the sixth dorsal segments, red- 

 dish (the distribution of red on the abdomen varies) ; clypeus, inner orbits below, 

 cheeks and thorax on sides and beneath with silvery pubescence. Length 5-7 mm. 



'^ . — Clypeus much larger and more produced than in the 9 < having the form 

 of that of pedicellatus, except that it is not revolute ; pedicellum as long or longer 

 than the first and second joints of the flagellum united, third joint of flagellum 

 nearly as long as the preceding two and pedicellum united, is lobate apically and 

 narrowed basally, the second joint is produced into a very long, stout tooth 

 apically. which is in length longer than the joint itself; in addition to the yellow 

 livery of the 9 > the % has the clypeus and mandibles yellowish; basal joint of 

 medial tarsi not laminate within. Length 4.5 mm. 



Illinois (Packard); Philadelphia, Pennsylvania (in August); 

 District of Columbia (Ashmead). Easily distinguished by color of 

 legs and abdomen, the absence of enclosure at base of middle seg- 

 ment, and by the peculiar S antennae. 



