No. 22.] HYMENOPTERA OF CONNECTICUT. IO5 



C. americana var. decimaculata Norton. 



C. americana var. dahlbomii Guerin-Meneville. 



C. americana var. alba Norton. 



Hoplocampi NJE. 

 Key to Genera. 



1. Claws bifid 3 



Claws never bifid 2 



2. Claws simple, without a tooth on their inner margin Marlattia p. 105 

 Claws with a minute, erect tooth at middle . . .Hoplocampa p. 105 



3. Front wings with the transverse part of M2 received in cell R 4 



some distance before the free part of the vein R 5 



Craterocercus p. 105 

 Front wings with the transverse part of M 2 either interstitial with 

 the free part of R 5 or received in cell R 5 . . . .Hemichroa p. 106 



Marlattia Ash mead. 



M. laricis (Marlatt). Hemichroa laricis Marlatt. 

 Body black, with the mouth-parts scarcely paler than the body- 

 color or slightly reddish ; tegulae and legs beyond the coxae strong- 

 ly infuscated, pallid ; wings infuscated ; clypeus broadly, shal- 

 lowly emarginate with a strong transverse ridge near the base; 

 pentagonal area distinct, ridges somewhat rounded, median fovea 

 shallow and circular; antennas with fourth segment much longer 

 than third; saw-guides short and rounded at tip. Length 5.5 

 mm. Larva feeds on larch. 



Hoplocampa Hartig. 



H. halcyon Norton. 



Body ochreous, with the mesonotum, metanotum, and ter- 

 gum of the abdomen black, or body sometimes entirely ochre- 

 ous; clypeus distinctly emarginate; pentagonal area and me- 

 dian fovea wanting; third segment of the antennae longer than 

 the fourth, tooth of claws minute. Length 3.5 mm. 



Lyme, 14 May, 191 1 (A. B. C). 



Craterocercus Rohwer. 



Key to Species. 



I. Mesonotum and collar marked with white 2 



Mesonotum and collar black; body black, with legs beyond 

 femora white; third segment of antennas shorter than 



