PARASITICA — CYNIPIDvE. 33 



.'50. — Parapsidal grooves on aulciior third wanting; second ahdoniinal segment 

 with perpendicuhirly declivous posterior margin ; the entire body, with 

 the exception of the larger part of abdomen, abundantly hairy; an- 

 tennae and tibiffi not fiml)riate ; (in N. Am. Oak-galls). 



27. Holcaspis ^layr. 

 Parapsidal grooves entire ; second abdominal segment above large, posteri- 

 orly prolonged, tongue-shaped (seen laterally triangular) ; the agamous 

 form is abundantly hairy, the antenna aud tii)iie timbriiite ; the sexual 

 form is in great part naked, the mesothorax polished, or nearly so, and 

 very shining; (in Oak-galls) 28. Dryophanta Forst. 



Males. 

 Base of scutellum, behind anterior margin, without trace of the usual fovese or 



transverse furrow 2. 



Base of scutellum. with two foveas, or a transverse furrow 3. 



2. — Disc of scutellum not higher tluui nH's<itborax and without a round uiedial 

 impression ; between the very high inserted antenuip and ocelli are two 

 short, deep antennal grooves, which are separated by a longitudinal 

 carina; basal and cubital veins joined by a single vein which lies be- 

 tween two elongate quadrate callosities ; (in Acacia galls). 



1. • Bschatocerus Mayr. 



Disc of scutellum higher than mesothorax, glabrous aud with a medial, 



round, wrinkled fovea; no antennal grooves; wings without callosities; 



(in Maple-galls) 2. *Pediaspis Tischb. 



3.— First annular abdominal segment longitudinally sulcate; the entire face 

 with radiatiug grooves ; frontal carina present, often very distinct and 



long, sometimes short and not distinct 4. 



First abdominal segment annular or handle-shaped, not grooved ; frontal 



carina wanting 5. 



4.— Marginal cell fully closed; antennse with 15 free joints; frontal carina 

 reaching usually to the lateral ocelli, rarely short ; (Inquiline in Oak- 

 galls) 12. Synerg-us Hartig. 



Marginal cell open at the wing margin, mai'ginal nervure not extending to 

 margin of wing; antennte with 14-15 free joints; frontal carina very 



short; (Inquiline in Oak-galls) 13. Sapholytus Fiirst. 



5. — Face with two parallel carina? from antennal insertion to clypeus ; antenna? 

 15-jointed, the third joint as long as fourth, it is emarginate and not 

 thickened; base of scutellum with two faint furrows; metathorax with 

 two parallel ridges; marginal cell entirely clo.sed ; (Intiuilinc in Oak- 

 galls) 11. Ceroptres Ilartig. 



Face without such carina? (>. 



6. — Mesopleurse, at lower half, with a strong longitudinal groove, often wrinkled 

 or coarsely punctured (apparently excejiting E. dichloccrns, whose % is 

 unknown to me) ; cheeks longer than half of the eyes; third joint of 

 antennte longest ; marginal cell entirely closed ; claws of posterior tarsi 



entire; (in Eose-galls) 1. Rhodites Ilartig. 



MesopleuriE without such groove 7. 



7. — Second abdominal segment (really the second and third, which are united 

 without suture) exceeding and overhanging all the other segments ; face 

 with very sharp radiating stritc ; clypeus usually not ajiparent; meso- 



TR.VNS. AMER. ENT. SOC. (5) SUIMM.. Vol.. 1887. 



