318 MEMOIRS OF THE CARNEGIE MUSEUM 



9. Marginal veiu short, hardly longer than the stigmal vein 10 



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



Marginal vein about twice as long as the stigmal veiu ; middle tibiae normal. 



Platyterma Walker. 

 Marginal veiu nearly thrice as long as the stigmal vein ; middle tibise with a small hirsute lobe 



outwardly near the tip Mesopolopus Westwood. 



10. Metathoracic spiracles oval Nasonia Ashwood. 



Tribe IV. Pteromalini. 



To this tribe belong all species having both mandibles 4-dentate. It is a large 

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



Fieromalus pupafumh. is the commonest and best known of all Chalcidoids, and 

 is found in every hemisphere ; it attacks various lepidopterous insects, Pieris rapx, 

 the cabbage butterfly, being 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. 



Antennfe with 3 ring-joints 3 



Antennse 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, punctate and tricarinate, the spiracles small, ob- 

 long ; metopleural ridge fringed with white hairs. 



Belonura Ashmead (type B. singularis Ashm.). 



4. Eyes hairy ; antennae clavate, incrassate. 5 



Eyes bare ; antennae filiform or subclavate 7 



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



surface 6 



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

 small.. Isocyrtus Walker (type I. Isetus Walk. ? = breviventris Walk.). 



6. Abdomen 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 ; tibiae with rigid bristles ; wings sometimes macu- 

 late, the postmarginal vein always longer than the stigmal. 



Urolepis Walker = Haltzoa Forster (type Ormocerus maritimus Walk.). 



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



somewhat shorter Trichoglenes Thomson (type Fieromalus compJanatus Ratz.). 



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



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



Trichomalus Thomson (type T. punctinucha Thoms.). 



