No. 22.] HYMENOPTERA OF CONNECTICUT. 297 



Polyblastus Hartig. 

 Males and females : length 5-7 mm. ; mostly black. 



Key to Species. 



Clypeus except at extreme base, mouth-parts, tegulse, a 

 broad annulus on basal middle of hind tibiae, tibial spurs 

 and more or less of basal portion of tarsal segments, white; 

 remainder of hind tibiae and tarsi black; rest of legs red- 

 dish; antennae dark brown, paler at base than elsewhere 



pedalis 



Clypeus, mouth-parts, tegulae, fore and mid coxae, and all 

 trochanters, lenion-yellow; upper middle annulus on hind 

 tibiae and basal portion of tarsi white; rest of tibiae and 

 tarsi black or blackish; remainder of legs reddish; antennae 

 brown, paler beneath than above, yellowish in male; first 

 dorsal segment typically blackish, with its apical half pale 

 rufous, second, third, and sometimes adjoining dorsal seg- 

 ments reddish tibialis 



P. pedalis (Cresson). 



Thompson, 11 July, 1905 (H. L. V.). 



°P. tibialis (Cresson). 



Scolobates Gravenhorst. 



°S. crassitarsus Gravenhorst. 



Female : length 8 mm. ; head black except face, mouth-parts, 

 and cheeks, which are reddish : thorax black ; abdomen black, ex- 

 cept beneath, and second and third dorsal segments, all of which 

 are reddish ; coxae, trochanters, base of femora, hind tarsi and 

 their tibiae, except at base, black; rest of legs reddish; antennae 

 reddish brown. 



Monoblastus Hartig. 



M. varifrons (Cresson). 



Female and male : length 5-7 mm. ; head and thorax mostly 

 black; abdomen usually reddish, with the basal and apical seg- 

 ments black or piceous, or the abdomen all or nearly all blackish ; 

 color of legs varying from entirely or almost entirely pale red- 

 dish, to dark reddish, with the fore and mid coxas and trochanters 

 yellowish white, and more or less of the hind coxae black, and 

 sometimes the trochanters and apex of tibiae and tarsi of hind 

 legs dusky; most of face, including the clypeus, and the mouth- 



