No. 22.] HYMENOPTERA OF CONNECTICUT. IO5 



°C. americana var. decimaculata Norton. 



°C. americana var. dahlbomii Guerin-Meneville. 



°C. americana var. alba Norton. 



HOPLOCAMPIN^. 

 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 Ri 



some distance before the free part of the vein R5 



Craterocercus p. 105 

 Front wings with the transverse part of M2 either interstitial with 

 the free part of R5 or received in cell R5 . . . .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 ; tegulse and legs beyond the coxse 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 antennae shorter than 



