NORTH AMERICAN IIYMENOPTERA. 147 



rather strongly striato-punctate, posterior face rugose, indistinctly ridged laterally, 

 sides finely striated ; coloj'ed and marked as in sexmaculatus, but apparently not 

 subject to such variation of the abdominal markings ; third segment spotted 

 usually, more rarely immaculate. Length 8-9 mm. 



% . — First joint of flagellum but little longer than the second ; middle segment 

 coarsely rugose, particularly above, the transverse series of fovese separating the 

 ujjper surface from posterior face stronger than in the 9 '• first and second joints 

 of medial tarsi scarcely produced at apex within ; colored and marked like the 

 9 ; fore and medial femora black and yellow, not or very obscurely, reddish; 

 abdomen usually with three terminal bands, the third segment always spotted. 

 Length 6-9 mm. 



Canada ; Maine (Packard) ; Massachu.setts ; New Hampshire ; 

 New York ; New Jersey ; Custer, South Dakota (Aldrich) ; Cohj- 

 rado. Tlie % resembles greatly that of C. odyneroides, but the 

 abdomen is indistinctly punctured. 



16. €ral»ro i>aiiciniacul»tti!« Pack. 



Crnhro p<tucim<icnl<ititK Packard, Proc. Ent. Soc. Phila., iv, p. 90. 9 • 

 9- — Head above with tolerably fine, even punctures, closer in front; space 

 between hind ocelli about equal to that between them and nearest eye-margin : 

 pronotum not dentate laterally ; dorsulum clo.sely and rugosely punctured, poste- 

 riorly, however, a little less strongly ; scutellum with strong, separated punctures ; 

 mesopleurse rugoso-striate ; middle segment rugoso-punctate, more rugose on 

 posterior face, the latter ridged at the sides, but not strongly, and separated from 

 the upper surface by a tolerably distinct ridge, which is not, however, always 

 present, sides finely striated ; first abdominal segment narrower than in xexmacu- 

 Intus and trifasciatus. Black ; mandibles except apex, scape in part, two spots on 

 pronotum, sometimes wanting, tubercles, variable spot on metanotum, fore and 

 medial tibise externally, hind pair except a spot within and at apex outwardly, 

 basal ]iortion of first joint of fore and medial tarsi sometimes, a short, more or 

 less ovate spot at each side of dorsal segments 2 and 4 and dot on segment 5 later- 

 ally, yellow; tarsi and tegulje blackish; wings fusco-hyaline, paler l)asally, ner- 

 vures and stigma black ; head, thorax and first segment of abdomen not conspicu- 

 ously hirsute. Length 7-8 mm. 



Illinois ; New Jersey in July ; District of Columbia ; Jacksonville, 

 Florida (Ashmead). This species approaches the follov/ing group 

 by the ])aucity of hair on the pygidial segment. The abdomen is 

 indistinctly punctured, however. 



o. Group ^caber. 



The species forming this group are distinguished by the distinctly 

 punctured abdomen, particularly the first segment, and by the females 

 lacking the coarse lateral fringe of hair on pygidial segment. Male 

 with the flagellum as in .^exmaculat^iK group ; fore tarsi not flattened ; 

 middle segment, at least the posterior face, in % , laterally, with 

 strong fovese, differing in this respect from the males of group chrys- 



TKANS. AM. ENT. SOC. XXII. JUNE, 1895. 



