2IO PSYCHE [Oct.— Dec. 



CLASSIFICATION OF THE GALL-WASPS AND THE PARASITIC 

 CYNIPOIDS, OR THE SUPERFAMILY CVNIPOIDEA. IV. 



BY WILLIAM H. ASHMEAD, A. M., SC. D., ASSISTANT CURATOR, U. S. NATIONAL 



MUSEUM. 



Tribe II. — Rhoditini. 



The members of this tribe form galls only on the Roseworts {Rosaceae), and 

 apparently, so far as the records go, will attack no other order of plants, the rose 

 {Rosa) and the bramble {Rubiis) especially being subject to their attacks ; they show 

 some affinity with the Aulacijii, some of which also form galls on the Rosaceae, but 

 these latter are easily distinguished by the venation of the front wings and by abdo- 

 minal differences, the hypopygium not being prominent or acutely pointed as in 

 the former, while the second segment is usually much shorter. 



Walsh, deceived by the statement of a farmer, described his genus Tribalia 

 as forming galls on the potato Solanmn tuberosum^ but these turn out to be root- 

 galls on rose, closely resembling a potato. The genus is very closely allied to 

 Rhodites Hartig and has been rechristened recently by Abbe Kieffer under the 

 name of Lytorhodites. 



Table of Genera. 



1. Front wings with the marginal cell open along the front margin . . 2 

 Front wings with the marginal cell completely closed .... 3 



2. Mesonotum usually subopaque, finely punctured or coriaceous, with distinct 



parapsidal furrows, the middle lobe usually with a median impressed line 

 posteriorly ; scutellum rugulose, without distinct foveae at base ; antennae 

 14-jointed in both sexes, the third joint in the ^ not longer than the 4th and 

 5th united ......... Tribalia \^^alsh 



= Lytorhodites Kiefifer 

 (Type T. batatorum Walsh.) 



3. Antennae 14-jointed in both sexes, the third joint very long, subclavate, in $ 



longer than the 4th and 5 th united .... Rhodites Hartig 



(Type Cynips rosae Linne.) 



Tribe III. — Pediaspidini. 



This tribe is probably the smallest known or at least not many species have as 

 yet been discovered, and these confine their attacks to the Mapleworts {Sapindaccae). 



