ASHMEAD : CLASSIFICATION OF THE CHALCID FLIES 331 



10. Abdomen ovate, the second and third segments very large, occupying the larger part of the surface. 



Cyrtogaster Walker (type C. vulgaris Walker). 



11. Metanotum punctate, with an abbreviated median carina 12 



Metanotum smooth, impunctate, but with a distinct median carina. 



Pronotum anteriorly not acute ; axillae separated at base of scutellum ; abdomen ovate or conic- 

 ovate, the second segment large, occupying about half the whole surface. 



Polycystus Westwood (type P. matthewsii Westw.). 



Pronotum anteriorly acute ; axillae meet at base of scutellum ; abdomen triangulated, much as 

 in Perilampus, the second segment large Trigonogastra Ashmead. 



12. Abdomen short, ovate, wider than the thorax, but a little shorter, the second segment twice the length 



of the third, the apical margin entire, the following segments gradually shortening. 



Eurydinota Forster (type E. leptomera Forster) . 



13. Abdomen with the second segment occupying fully one third the whole surface, 3 to 5 subequal in 



length, the sixth longer than the fifth, the two following very short. 



Pterosema Forster (type P. variicolor Forst.). 



14. Metanotum not closely punctate and tricariuate 15 



Metanotum not long, and smooth, the median carina and lateral folds usually present. 



Middle tibiae normal ; abdomen ovate, pointed at apex, the petiole shagreened, with a median 

 ridge, the second segment the largest, occupying about half the whole surface, with a slight 

 incision at apex Polycystus Westwood. 



Middle tibiae abnormal, incrassate ; abdomen short ovate Spaniopus Walker 



(type 8. dissimilis Walk.). 



15. Abdomen conic-ovate, the petiole rugulose, the second segment occupying at the most one third the 



whole surface, the following segments subequal, less than half the length of the second ; pi'onotum 

 not short Bubekia Dalla Torre (type Brachycrepis fricarinata Ashm.). 



16. Petiole of abdomen long, always longer than the hind coxae 17 



Petiole of abdomen shorter, not longer than the hind coxae 29 



17. Mesothoracic furrows complete ' IS 



Mesothoracic furrows incomplete, indicated only anteriorly 21 



18. Head with compressed cheeks ; pronotum not large, not transverse quadrate 19 



Head sublenticular, with rounded cheeks, the vertex antero-posteriorly narrow ; antennae filiform, 



pubescent Syntomopus Walker. 



19. Scutellum with a cross-furrow before apex 20 



Scutellum without a cross-furrow before apex 28 



20. Abdomen with dorsal segments 2 and 3 large, the second twice the length of the third and deeply, 



broadly, semicircularly emarginate at apex ; flagellum subclavate, pubescent . . . Merismus Walker. 



Abdomen ovate, the second dorsal segment large, occupying more than half the whole surface, not 



emarginate at apex Acroclisis Forster. 



21. Metanotum usually smooth, with lateral folds and a median carina ; both mandibles 4-dentate 24 



Metanotum closely punctate and often, but not always, without lateral folds or a median carina, rarely 



distinct 22 



22. Abdomen not triangular, either oval or oblong-oval 23 



Abdomen triangular ; mandibles 4-dentate, the outer tooth acute ; pronotum anteriorly truncate, the 



upper front margin acute Trigonogastra Ashmead. 



23. Metathorax not long, but produced into a subglobose neck at apex ; both mandibles 3-dentate .... 24 



