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



CYNIPID.E 

 Key to Genera. 



1. Females , 2 



Males: base of scutel with two foveae, or a transverse fur- 

 row 18 



2. Wings rudimentary or wanting 3 



Wings fully developed; base of scutel with two foveae or a 

 transverse groove 4 



3. Scutel terminating in an obtuse thorn Philonix p. 380 



Scutel obtuse posteriorly; notauli entire; antennae distinctly 



14-jointed; face with an obtuse carina extending from front 

 to between antennal insertions, head broader behind eyes; 

 ventral thorn only one to one and one-half times as long 

 as thick; wingless, or with rudimentary wings. .Biorhiza p. 383 



4. First abdominal segment deeply longitudinally furrowed, 



second and third segments united, without suture; the en- 

 tire face with sharp radiating furrows, frontal groove dis- 

 tinct, short or reaching to, or very near to, the lateral 

 ocelli; marginal cell completely closed; antennae 13-, 14-, 



or 15-jointed Synergus p. 377 



First abdominal segment smooth; frontal groove entirely 

 absent 5 



5. Face without two distinct parallel carinae 6 



Face with two distinct parallel carinae, extending from the 



insertion of antennae to clypeus; antennae 12- or 13-jointed, 

 third joint as long as fourth; base of scutel with two shal- 

 low foveae; propodeum with two parallel grooves; third ab- 

 dominal segment larger than second, the two connate, but 

 with a fine suture between them, these forming the great- 

 est part of the abdomen; marginal cells closed ; 



Ceroptrcs p. 375 



6. Hypopygium not prolonged to a fine point, usually emargi- 



nate beneath, and often with a very short ventral spine; 

 fore tibiae with an indistinct or small spine; clypeus pres- 

 ent, at least defined at the sides 7 



Hypopygium plowshare-shaped, gradually narrowed to a fine 

 point, without a prominent ventral spine; mesopleurae on 

 the lower half with strong, often wrinkled or deeply 

 punctate, longitudinal groove, except in R. dichlocerus; 

 margina cell closed; claws of hind tarsi entire. .Rhodites p. 440 



7. A suture between mesothorax and scutel, the latter with a 



distinct, more or less elevated carinate anterior margin 8 

 A suture between mesothorax and scutel, anterior margin 

 of latter not thickened and carinate, in front of trans- 

 verse groove, or, very rarely, feebly so; posterior margin 

 of mesothorax medially arcuately emarginate and laterally 

 more or less arcuately prolonged or rounded out, each 



