188 [August, 



5 (4) Claws bifid (see Fig. 8) 6. 



Claws with subapical tooth Lyda. 



6 (5) Intercostal vein forked before apex, joining botli eosta and subcosta... 



Pamphiliiis . 



Intercostal vein not forked, joining subcosta only Neurotoma. 



7 (4) 3rd joint of ant. evidently longer tlian the 4th ; species mostly rather 



larger. 



(a) Hind tibiiB with owe spine before the spurs Macrocephux. 



{h) Hind tibise with ttvo such spines Jantm. 



3rd joint of ant. and 4th subequal. Antennae more or less thickened 



apically (subclavate) : species mostly small 8. 



8 (7) Pronotum quadrate (as long as broad, its base scarcely emarginate)... 



CaJamenta. 



Pronotum transverse (t. e., evidently broader than long) 9. 



9 (8) $ with the disc of the 5th (antepenultimate) ventral plate convex and 



naked : ? with ss. (seen from above) parallel-sided or somewhat 

 tapering Cepkvs. 



S with the 5th and 6th ventral plates impressed before the apex, the im- 



pressions densely clothed with short stiff hairs : 9 ss. widening from 

 base to apex 10. 



10 (9) Thickening of ant. very gentle and gradual, commencing as early as the 



7th joint Astatus. 



Antennae rather suddenly and conspicuously dilated near the apex, not 



before the 9th joint Trachelus. 



11 (2) Intercostal a. crossed by a n. The radius reaches the margin of the 



wing Xiphydria. 



Intercostal a. without transverse n. The radius disappears before the 



margin of the wing 12. 



12 (11) Humeral a. crossed by an oblique w. Eadial a. divided. Discoidal n. 



about interstitial with the very oblique let cubital n Sirex. 



Humeral a. petiolate. Endial a. undivided. Discoidal n. remote from 



Ist cubital « Ory.isus. 



13 (1) ,4n^. from about the 5th or Rth joint swollen into a definite club ...14. 



Ant. without definite apical club 16. 



14 (13) Humeral a. " contracted " Abia. 



■ Humeral a. " with short perpendicular n." 15. 



15 (14) Claws with a small but sharp procumbent tooth some way before their 



apices within (in the ^ the tooth is extremely minute). Hind femora 

 beneath simple. Abdomen often richly coloured (violet, bright 

 yellow, &c.). Not very pilose Cimbex. 



Claws simple. Hind femora generally toothed conspicuously beneath. 



Very pilose, brown-looking insects, with abdomen fuscous or black 

 above (but sometimes more or less rufescent at the apex and beneath) ... 



Trichiosoma. 



16 (13) Ant. with not less than 6 joints, generally at least 9 18. 



Ant. with only 3 joints, the last very long (constituting practically the 

 whole of the flagellum) 17. 



17 (16) Intercostal M. present. Kadial a. with " appendicular cell " at apex. Last 



joint of ant. simple in both sexes Arge. 



