No. 22.] HYMENOPTERA OF CONNECTICUT. 37 1 



fourth; base of scutel with two distinctly separated foveae; 

 moderately thick antennae 14-jointed; mesothorax polished; 



body yellow or reddish yellow Biorhiza p. 383 



Parapsidal grooves of the alutaceous mesothorax shallow, 

 feebly or not at all impressed anteriorly; antennae 13- to 

 14-jointed, third and fourth joints equal; middle arc of . 

 metathorax with a more or less distinct median longitud- 

 inal carina; cheeks with a sharp furrow; antennae with thir- 

 teen joints, head distinctly broader behind eyes; base of 

 scutel with an arcuate transverse groove, metathoracic 

 ridges almost straight and parallel Loxaulus p. 395 



17. Parapsidal grooves on anterior third of mesonotum wanting; 



second abdominal segment with perpendicularly declivous 

 posterior margin; entire body, with exception of the larger 

 part of abdomen, abundantly hairy; antennae and tibiae not 



fimbriate Holcaspis p. 401 



Parapsidal grooves entire; second abdominal segment above 

 posteriorly prolonged, tongue-shaped or, when seen lat- 

 erally, triangular; agamous form abundantly hairy; anten- 

 nae and tibiae fimbriate; sexual form in great part bare; 



mesothorax polished, or nearly so, and very shining 



Dryophanta p. 396 



18. First annular abdominal segment longitudinally sulcate; en- 



tire face with radiating grooves; frontal carina present, 

 often very distinct and long, sometimes short and indis- 

 tinct; marginal cell closed; antennae with fifteen joints, 



frontal carina usually reaching to lateral ocelli 



Synergus p. 377 

 First abdominal segment annular or cylindrical, not grooved; 

 frontal carina wanting .. 19 



19. Face without carinae as in Ceroptres 20 



Face with two parallel carinae extending from insertion of an- 

 tennae to clypeus, antennae 15-jointed, third joint as long 



as fourth, emarginate; base of scutel with two faint fur- 

 rows, metathorax with two parallel ridges; marginal cell 

 closed Ceroptres p. 375 



20. Mesopleurae without a groove as in Rhodites 21 



Mesopleurae with their lower half provided with a strong 



longitudinal groove, often wrinkled or coarsely punctate, 

 except perhaps in R. dichlocerus ; cheeks longer than half 

 of eyes, third joint of antennae the longest; marginal cell 

 closed; claws of posterior tarsi entire Rhodites p. 440 



21. Second abdominal segment overhanging all the others; 

 face with radiating striae; mesothorax transversely wrinkled 



anteriorly; clypeus, at least laterally, well developed; a 

 more or less distinct ridge on middle of anterior margin 

 of scutel; cheeks with a sharp furrow, antennae 14- or 



