290 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



H. inceptus Cresson. 



Female and male: length 8-12 mm. 



°H. longicornis Cresson. 



Female and male: length 10 mm.; abdomen dark reddish; 

 areolet sometimes incomplete or wanting; trochanters and fore 

 and mid coxae yellow. 



Mesoleptidea Viereck. 



Mesoleptus Authors, not Gravenhorst. 



Key to Species. 



1. Clypeus transversely impressed before apex, usually ridged 



transversely back of the impression and more or less 



emarginate at the front edge; hind femora pale 2 



Clypeus elevated, without a distinct margin at apex or trans- 

 verse impression before apex; hind femora rufous; petiole 

 of abdomen and coxae rufous; scutel and often part of 

 thorax rufous rufigastra 



2. Antennae without a white annulus; abdominal segments black, 



with apical margins more or less white 3 



Antennae reddish albifrons 



3. Sternum and scutel white decens 



Sternum of female honey-yellow, scutel of male with two 



white stripes zebrata 



°M. rufigastra Provancher. 



Female : length 5 mm. ; head and thorax mostly black ; abdo- 

 men mostly reddish. 

 °M. zebrata Davis. 



Female and male: length 5 mm.; mostly black, ornamented 

 with pure ivory-white; whitish ornaments in the male not so 

 pure white except on the abdomen. 

 *M. albifrons Cresson. 

 Female : length 9 mm. ; mostly reddish, with the head, pro- 

 notum, mesonotum, abdomen beyond petiole, and apical por- 

 tion of hind tibiae, dusky red to black. 

 *M. decens Cresson. 

 Female and male : length 7-10 mm ; mostly black, ornamented 

 with white. 



Gausocentrus Foerster. 

 °G. g5n*ini Ash mead. 



Male: length 3.5-3.8 mm.; blacky shining, impunctate or 

 apparently so, clothed with sparse grayish hairs that are more in 



