1 903] ASH ME A D:—C YNIPOIDEA 211 



No species is yet known from America, but a more careful search for galls on our 

 numerous species of maples will probably show that we have representatives. 



The European species form galls on the leaves of Acer pseudoplatanus L. and 

 fall into a single genus, which may be recognized by the following characters : — 

 Marginal cell open along the front margin, the first abscissa of the radius 

 angulated or sub-angulated, the areolet distinct ; thorax smooth, shining, with 

 distinct, complete parapsidal furrows ; scutellum somewhat elevated on the 

 disk and higher than the mesonotum, the elevated disk is flat or has a slight 

 median depression, either smooth or punctate; antennae in aganwus 9 15- 

 or i6-jointed, in sexual form 14-jointed in 9 and 15-jointed in J* , the third 

 joint scarcely as long as the scape and pedicel united, but longer than the 

 fourth ......... Pediaspis Tischbein 



^ Bathyaspis Forster 

 (Type P. sorbi I'ischb.) 



Tribe IV. — Aulacini. 



At present this tribe is not well represented in genera and species, but prob- 

 ably will be found to be fully as large as the tribe Cynipini, since its known mem- 

 bers attack several orders of plants and it necessarily follows that there must be 

 many genera and species still discoverai:>le. 



The known species form galls on the Roseworts {Rosaceae), the Poppy worts 

 {Fapaveraceae), the Crucifers {Cruciferaceae), the Mallows {Ma/vaeeae), the Su- 

 macs (^//c?rc?;7//rtra'rt'^) , the Asterworts {Compositaeeae) , the Heathworts {Ericaceae), 

 and the Figworts {Scrophulariaceae). 



Sixteen genera are already known which may be recognized by the use of the 

 following table : — 



Table of Genera. 



I. Marginal cell r/(9xtv/ along the front margin ...... 2 



Marginal cell open along the front margin. 



First abscissa of the radius curved, the apical branch of the subcostal 

 vein straight : parapsidal furrows sharply defined, complete ; antennae 

 in 9 13-14-jointed, the third joint shorter than the fourth or no longer, 

 in J 14-jointed. ...'... Aulacidea Ashmead 



(Type Aulax mulgidiicola Ashm.) 

 First abscissa of the radius almost straight, the apical branch of the sub- 

 costal vein curved ; parapsidal furrows incomplete or vaguely, indis- 



