lflll] Cynipidce of California 333 



5 Hypopygium plowshare-shaped, tarsal claws simple 6 

 Hypopygium not usualrj produced, ati and ending usuall] in a 



pim entral valve) 8 



6 Scutellum withoul foveas; radial cell open on costal margin; abdomen 



micro " 15 Lytorhodites K i . ■ fT . 

 Scutellum u ually with basal foveas; abdomen without microscopic 

 reticulation 



7 Radial cell closed. Galls on Rosa 14 Rhodites I 



Radial cell open. G i; Compsodryoxenus .\ 



8 Suture separating me onotum and scutellum - ; the latter without 



foveas, at in a ridge, i n arcual e trans'v i 



■ delimiting mesonotum posteriorly, , wanting 



or not distinctly percurrent. Gall i u 2 Neuroterus 1 1. 



Sutun sep mesonotum and scutellum, anterior margin o£ latter 

 elevated to form a ridge 9 



9 Body covered with silky pile, abdomen doi unetimes glabrous; 



radial cell open. Galls on Quercus (i Cynips L. 



Abdomen glabrous, 2nd segment alom sometimes sparsely pubesi 

 laterallj at base 10 



10 Radial cell closed; pronotum not medially contracted 11 



Radial (ill open or partly open on costal margin; pronotum sometimes 



medially contracted 12 



11 Mesonotum whollj smooth, ('.alls on Rubui 12 Diastrophus Hartig 

 Mi onotum not wholly smooth; antennae 12 I. fnquilines in galls 



• in Rosa and Quercus. 11 Periclistus Forst. 



12 2nd abdominal segmenl produced linguiform on dorsum; parap 



pi rcurrent; base of scutellum with an arcuate 1 1 .m ,\ erse groove; ridges 

 on metanotum arcuate; claws bidentate. Galls on Quercus. 



3 Diplolepis L. Geoff r. 

 2nd abdominal segment not produced linguiform 13 



13 Claws limple, sometimes obscurelj den i but then antennae slenderer 



apical third than at middle, and metanotal ridges angularly curved. 



Galls mi Quercus 8 Callirhytis Forst. 



Claws bidentate; antennae no1 slenderer at apical third than at middle; 

 metanotal ridges straight and parallel, or arcuate 11 



14 Scutellum basally with arcuate transverse gn».v.-; j >. ir. q .,-, : . lal groovi 



incomplete; head and thorax densely pubescent; Galls on Quercus 



4 Disholcaspis D. T. & Kieff. 

 Scutellum with basal foveas; parapsidal groove! percurrent. ('.alls on 

 Quercus' 7 Andricus Hartig 



1 BIORHIZA Westw. 



Biorhiza, Westwood, Intr. Classif. Ins., vol. 2 Syn. (1840), p. 56. 

 Philonix, A, Fitch, 5th Rep. Ins. N. York (1859), p. 3. 



Wings in agamic generation wanting or very rudimentary, in sexual 

 female very rudimentary, in male always present. Antennae of female 

 13-14 segmented, of male 15-segmented, 3rd segment longer than the 

 4th, in male often strongly excised, succeeding segments progressively 

 shorter but all longer than broad. Pronotum narrow in the middle, 

 mesonotum in wingless generation only partly smooth and shining, in 

 generation with developed and rudimentary wings usually entirely so, 

 parapsidal grooves complete or little marked, scutellum in wingless 

 generation with a transverse groove at base, in female with rudimentary 

 wings, with weak foveas separated by a carina, in generation with devel- 

 oped wings, with two sharply separated foveae. Abdomen large, lat- 

 erally compressed or globose, smooth or pubescent, ventral spine short. 

 Tarsal claws bidentate. 



