ASHMEAD : CLASSIFICATION OF THE CHALCID FLIES 317 



23. Pronotum broad, the front margin acute ; metathoracic spiracles oval or oblong ; first joint of the 



funicle always longer than the pedicel Habrocytus Thomson. 



Pronotum not broad, the front margin not acute ; first joint of the funicle much shorter than the pedi- 

 cel i Mormoniella Ashmead. 



Tribe III. Eutelini. 

 In its mandibular characters this tribe agrees with the Rhaphitelini, and is easily 

 confused with the latter ; but the antennae are inserted differently, always low down 

 on the face, usually close to the clypeus, on or below an imaginary line drawn from 

 the base of the eyes. 



The species falling in this group differ also in habits since they attack dipterous 

 gall-makers, CecidomycuM, etc. 



TABLE OF GENERA. 



1. Females 2 



Males 7 



2. Metathorax with distinct lateral folds 3 



Metathorax without lateral folds. 



Marginal vein not or only a little longer than the stigmal vein ; metathorax long ; first joint of 

 the flagellum short. 



Antennae inserted on an imaginary line drawn from the base of the eyes ; abdomen not 

 compressed, the ventral valve normal. Amblymerus Walker (type A. dubius Walk.). 

 Antennae inserted just above the clypeus, below such an imaginary line ; abdomen com- 

 pressed, the ventral valve prominent Psilonotus Walker (tyj^e P. adamas Walk.). 



3. Thorax short ; head with a rather narrow vertex, the ocelli arranged in a very shoi-t obtuse angle . . 4 

 Thorax long ; head with a broad vertex ; ocelli large, in a triangle ; pronotum with the front margin 



acute 5 



4. Marginal vein about twice as long as the stigmal vein Eutelus Walker (type E. vulgaris Walk.). 



Marginal vein not nearly twice as long as the stigmal vein. 



Platymesopus Westwood (type P. tibialis Westw.). 



5. Abdomen ovate, shorter than the thorax , 6 



Abdomen long, couically produced, triangularly compressed or carinate beneath. 



Marginal vein hardly twice as long as the stigmal vein. 



Platyterma Walker (type P. nobile Walk.). 

 Marginal vein nearly thrice as long as the stigmal vein. 



Mesopolobus Westwood (type M. fasciiventris Westw.). 



6. Marginal vein hardly longer than the stigmal vein ; anteuna3 rather short, the flagellum subclavate, 



the pedicel long, obconical, the funicle joints wider than long ; metathorax not short, with a me- 

 dian carina, the spiracles oval Nasonia Ashmead, g. nov. (type N. brevicornis Ashm.). 



7. Thorax short ; head with rather a narrow vertex ; ocelli arranged in a very obtuse angle 8 



Thorax long ; head with a bioad vertex ; ocelli large, arranged in a triangle 9 



8. Marginal vein about twice as long as the stigmal vein ; middle tibiae normal .Eutelus Walker. 



Marginal vein not nearly twice as long as the stigmal vein ; middle tibiae broadly dilated. 



Platymesopus Westwood. 



