44 GENERA OF HYMENOPTERA. 



Intermediate tibise with only one apical spur ; niesothorax rugose. 



MototraehyM Marsh. 



3. — Abdomen petiolute, very rarely sessile or subsessile (as in Plectiscux) 4. 



Abdomen sessile or subsessile, or if subpetiolate. the petiole depressed ; areolet 



rhomboidal 24. 



4. — Posterior femora unarmed 5. 



PtJsterior femora armed with a tooth beneath 23. 



5.— Marginal cell lanceolate 6. 



Marginal cell short, subtriangular or almost trapezoidal 22. 



fi. — Median and submedian cellsof anterior wings not confluent; third discoidal 



cell present, therefore two recurrent nervures 7. 



Median and submedian cells confluent by the absence of the externo-medial 

 nervure ; second discoidal cell small, quadrangular, much narrowed be- 

 neath, third dist'oidal absent, therefore only one recurrent nerrure ; areolet 

 wanting ; marginal cell small, sublanceolate ; the stigma very slender, 

 scjircely thicker than the costal nervure ; wings short, narrow ; thorax 

 rugose, metathorax and jjleura silvery -sericeous ; antennie short, about 

 as long as head and thorax ; legs slender, femora unarmed ; abdomen 

 long, slender, sickle-shaped, nearly three times longer than head and 



thorax Pharwalia Cress. 



7. — -Spiracles of metathorax oval or elongate, rarely round (as in Absyrtus) 8. 



Spiracles of metJithoni;'- round 14. 



8. — Tarssil claws not pectinate 9. 



Tarsal claws pectinat ■ 10. 



9. — Cubito-discoidal cell i< ceiving the recurrent nervure in the middle, the third 

 discoidal cell not narrowed at base. 

 Posterior tarsi with the first joint about twice as long as the second. 

 Apical margin of clypeus broadly reflexed or bilobed. 



^Schizoloma Wesm. 



Apical margin of clypeus truncate Exochiluni Wesm. 



Posterior tar.si with the first joint about four times as long as the second; 



apical margin of clypeus broadly rounded. ..Heteropclina Wesm. 



Cubito-discoidal cell receiving the recurrent nervure before the middle, the 



third discoidal cell narrowed at base ; apical margin of clypeus acutely 



angled or pointed. 



Eyes not hairy Anonialon Grav. 



Eyes hairy ^Trichomiiia Wesm. 



10. — Scutellum convex, apex rounded; areolet jjresent 11. 



Scutellum depressed, subquadrate ; areolet wanting; eyes deeply emargin- 



ate ; antennro scarcely longer than half the body...tliapops llolmgr. 



11. — Spiracles of first abdominal segment placed in middle or before the middle. .12. 



Spiracles of first abdominal segment placed behind the middle; head not 



extended behind the eyes; clypeus not separated; teeth of mandibles 



subequal ; sciipe feebly emarginate at tip above. ..C'ampople.ic Grav. 



12.— Spiracles of metathorax oblong 13. 



Spiracles of metathorax round ^AbNyrtus Holmgr. 



13. — Head much swollen behind the eyes, the latter not touching ba.se of mandi- 

 bles, which are tolerably broad, with two equal teeth at apex ; metatho- 

 rax carinate and tuberculate ; spiracles of first abdcmiiual segment 

 placed in the middle Opheltes Holmgr. 



