318 MEMOIRS OF THE CARNEGIE MUSEUM 



9. MaigiiKil vuiri short, liurJly longer than the stigmal vein 10 



Marginal vein from abjut twice to thrice as long as the stigmal vein. 



Marginal vein ab3ut twice as long as the stigmal vein ; middle tibiie normal. 



Platytenna Walker. 

 Blarginal vein nearly thrice as long as the stigmal vein ; middle tibiie with a small hir.sute lobe 



outwardly near the tip Mesopolopus Westwuod. 



10. Metatlioraeic spiracles oval Nasonia Ashwuod. 



TiMin-: IV'. rtcroinalini. 



To this tri!>o belong all species having both rnaudiltlus -l-deutate. It is a large 

 tribe, with many genera and species, and some are of world-wide distribution. 



Pic romalm pupunimlj. is the commonest and best known of all Thalcidoids, and 

 is found in every hemisphere ; it attacks various lejiidopterous insects, Picris rapsc, 

 the cabbage butterfly, Ijeing especially subject to its attacks. 



TABLE OF GENERA. 



1. Females 2 



Males 30 



2. Occipital foraminal depression immargined 8 



Occipital foraminal depression margined or rimmed. 



Metathorax produced into a subglobose neck at apex, the median carina and lateral folds 

 usually present. 



Antennffi with 3 ring-joints 3 



Autennse with 2 ring-joints 4 



3. Abdomen with the second segment large, the last segment produced into a long, slender, compressed 



stylus resembling an ovipositor. 



Metathorax produced into a subglobose neck, punclate and tricarinate, the spiracles small, ob- 

 long ; metopleural ridge fringed with white hairs. 



Belonura Ashmead (type B. singularis Ashm.). 



4. Eyes hairy ; antenna^ clavate, incras.sate 5 



Eyes bare ; antennaj filiform or subclavate 7 



5. Abdomen ovate or rotund, the second segment small or never occupying more than half the whole 



surftice C 



Abdomen ovate, the second segment very large, occupying most of the surface, the third very 



small.. Isocyrtus Walker (type J. Ixlus Walk. ? = breviventris Walk.). 



G. Abdoman ovate, the second segment occupying at most not more than half the surface, the third not 

 small, two or more times longer than the fourth ; tibiie with rigid bristles; wings sometimes macu- 

 late, the postmarginal vein always longer than the stigmal. 



TJrolepis Walker = Halizoa Forster (type Ormocerus marilimus Walk.). 

 Abdomen rotund ; wings immaculate, the postmarginal vein not longer than the stigmal, usually 



somewhat shoi-ter Trichoglenes Thomson (type Picromalus complanatm Ratz.). 



7. Abdomen ovate, the second segment occupying not more than one tliiid the surface, the sides more or 

 less fimbriate ; fuuicle joints 4-6 a little wider than long, the club subulate. 



Trichomalus Thomson (type T. piim-li nucha Thorns.). 



