No. 22.] HYMENOPTERA OF CONNECTICUT. 127 



densely clothed with hairs; body black, with the 'center of 

 the basal abdominal segment, the three following segments and 

 part of the fourth, reddish yellow ; tip of clypeus, mouth-parts, 

 anterior legs in great part, coxse except at base, trochanters, 

 bases of femora, and basal half of tibiae of hind legs, pallid; 

 pronotum and tegulae pallid, infuscated. Length 8 mm. 



rufocincta 

 Antenna; with third segment longer than fourth; median 

 fovea very shallow, indistinct; ocellar basin well-defined, 

 with prominent anterior angle; saw-guides short, stout, 

 scarcely projecting; body black, with angles of pronotum, 

 tegulae, and abdominal segments one to five dorsally and 

 ventrally, yellowish ferruginous; mouth-parts strongly in- 

 fuscated; coxae except at base, trochanters, and basal half 

 of posterior tibiae, whitish; anterior and posterior faces of 

 anterior tibiae and tarsi pallid. Length 6 mm dyari 



16. Head and thorax finely punctate; clypeus shallowly and 



broadly emarginate, lobes triangular and rather pointed; 

 median fovea circular, deeply excavated; frontal crest and 

 sides of ocellar basin strongly raised, frontal crest un- 

 broken; saw-guides rather robust, rugose, with numerous 

 hairs; body black, with tip of clypeus, labrum, palpi, angles 

 of pronotum, tegulae, abdomen except basal plates, first seg- 

 ment on dorsum, saw-guides, and legs (except bases of coxse, 

 tips of hind femora, apical two-thirds of hind tibiae, and 

 hind tarsi), rufous; basal third of hind tibiae, white. Length 



7-5 mm erythrogastra 



Head and thorax rather coarsely punctate, somewhat shiny; 

 clypeus very shallowly emarginate, lobes very short and 

 broadly rounded; median fovea broad and shallow; frontal 

 crest and sides of ocellar basin distinctly elevated; 

 frontal crest rarely indistinctly broken; saw-guides not 

 very robust, rounded at apex, and with rather long and 

 dense hairs; body black, with bases of antennae, tip of clyp- 

 eus, labrum, palpi, angles of pronotum, tegulae, legs (ex- 

 cept apex of posterior femora, apical half of posterior 

 tibiae, and hind tarsi), and abdomen except basal plates, yel- 

 lowish ferruginous. Length 6-7 mm corylus 



17. Angles of pronotum and coxae black; walls of ocellar basin 



distinctly defined; frontal crest prominent, unbroken; me- 

 dian fovea shallow; saw-guides robust, obtusely pointed, 

 straight on the upper margins ; body black, with labrum pallid ; 

 tips of anterior femora, hind femora, and abdomen except 

 apical segment, orange-yellow, inclined to reddish on legs ; 



wings smoky. Length 8.5 mm fulvicrus 



Angles of pronotum and the coxae pale 18 



