1 903] ASHMEAD : — CYXIPOIDEA 1 4 1 



is a most striking looking wasp on account of the shape of the head and the 

 foliaceous dilations of the thorax and legs. Professor Westwood, uncertain whether 

 it was a cynipid or a proctotrypid, finally placed it doubtfully among the latter in 

 the subfamily Diapriinae. 



Unfortunately, I have not yet had a specimen for examination, but, judging 

 from Westwood's description and figure, and especially of the venation, I have very 

 little doubt of its being a cynipoid and not a proctotrypoid, so for the present treat 

 it as a tribe in the subfamily Xystinac. 



Besides the foliaceous dilations on the pronotum, femora and tibiae, it may be 

 recognized by the following characters : — 



Wings well developed, with the venation distinct, the marginal cell large, as in 

 Xystiis : head subglobose, with a short, porrect snout; antennae in 9 14-jointed, 

 filiform ( $ unknown) . . . . . . Loboscelidia Westwood 



(Type L. rufescens VVestw.) 



Tribe II. — Xystini. 



This tribe is distinguished by the head, thorax, and legs being normal, the 

 pronotum and legs always without foliaceous dilations. The antennae in the 

 females are 12- or 13-jointed, in the males 13- or 14-jointed. 



The species are numerous and attack almost exclusively species belonging to 

 the homopterous family Aphididae. 



Table of Genera. 



Mesonotum entirely without parapsidal furrows ...... i 



Mesonotum with the parapsidal furrows more or less distinct ... 7 



1. Wings usually fully developed or if abbreviated always 7uith a distinctly defined 

 marginal cell ........... 2 



2. Wings abbreviated, without a marginal cell. 



Antennae in 9 13-jointed, in $ 14-jointed . Pezophycta Forster 



(Type Xystus brachyptera Hartig.) 



3. Marginal cell open along the front margin ...... 3 



Marginal cell completely dosed ........ 5 



3. Radius extending to the front margin; antennae in 9 13-jointed, in $ 

 14-jointed ............ 4 



Radius not extending to the front margin; antennae in 9 12-jointed, in $ 

 13-jointed .......... Dilyta Forster 



(Type D. subclavata Forst.) 



