No. 22.] HYMENOPTERA OF CONNECTICUT. 663 



" Differs from C. singularis in its much narrower and slenderer 

 body, narrower head, larger palpi, with mandibles grooved towards 

 insertion in the middle area; in the wholly black mesothorax, except 

 the yellow tubercle; and in the abdomen having an additional pair of 

 fasciae. The tip of the abdomen is scarcely one-half as large, of 

 different proportions, being longer and narrower than in C. singularis, 

 while the abdomen is much flattened above, where in C. singularis it is 

 much more convex." 



Probably belongs to Solenius, and to the subgenus Lophocrabro. 



C. unicus Fatten. Canadian Entomologist, Vol. xi, p. 214. 



" Female. Length 5 mm. Black ; tips of mandibles, tegulae, 

 spurs of posterior tibiae and extreme base of the first joint of posterior 

 tarsi, the last joint of posterior tarsi, the tips of all the coxae and tro- 

 chanters and the tips of the posterior femora and tibiae, piceous. 

 Scape beneath, dot on first joint of flagellum, the tubercles, the four 

 anterior tibiae excepting a black spot beneath, and the tips of the 

 four anterior femora, yellow. The four anterior tarsi, excepting the 

 fulvous apical joint, and the base of the posterior tibiae, whitish. 

 Clypeus black, covered with a silvery pile; flagellum fulvous beneath. 

 Thorax beneath and the abdomen with short scattered pubescence. 

 The abdomen excepting the rufo-piceous enclosure on the sixth seg- 

 ment entirely black. Wings hyaline, beautifully iridescent, the 

 nervures and stigma blac"k. Head, thorax and abdomen smooth. The 

 head as wide as the thorax, and the vertex longer than wide, the front 

 narrow. The ocelli arranged in an equilateral triangle, each in a 

 separate depression; from the anterior ocellus an impressed line 

 extends downwards upon the face and another extends backwards 

 upon the vertex; on the inner orbit on the vertex is a slight groove 

 curving at the end to come in a line with a short oblique groove 

 behind each posterior ocellus. Prothorax sharply angulated beneath, 

 mesopleura sharply angulated beneath near the coxae. Anterior 

 portion of the mesonotum with four short lines which extend upon the 

 collar as slight notches; mesonotum with a slight groove on each 

 side of the disk and with a marginal row of reticulations over the 

 tegulae. Scutellum quadrate, connected with the mesonotum by the 

 broad lateral angles between which it is separated by a basal row 

 of large reticulations. The semi-circular area on base of metathorax 

 is encircled by a row of similar reticulations and divided by a deep 

 median groove. Similar rows of reticulations extend in a *ghtly 

 curved line down upon the mesopleura from the anterior wings and 

 others mark the lateral sutures of the metathorax. The sides of the 

 mesothorax beneath and the sides and posterior face of the metathorax 

 are finely striate; these strije curve upon the metathorax above and 

 are represented within the enclosure by striae of microscopic fineness. 

 The posterior face of the metathorax has a deep triangular median 

 depression above and is more coarsely rugose beneath. Area on the 



