90 Journal New York Entomological Society. [Voi. xi. 



5. Metascutellum with three spines Trissacatltha As/imeaif. 



(type T. americana Ashm. ). 



Metascutellum with one spine Xenomerus Walker. 



(type A', ergcmia Walk.). 



6. Postscutellnm with a single large spine ; mandibles bifid, the outer tooth the larger. 



Posterior femora, tibise and tarsi slender, the tibial spurs weak. 



Prosacantha Nees (type P. longuomis Nees). 

 PosteHor femora swollen, tibia; dilated at apex, the basal joint of tarsi short, 



stout, the tibial spurs not weak TelcaS Latreille. 



(type T. ciavicorjiis 'Latk.). 



7. Apterous forms 8 



Winged. 



Metascutellum with a spine or tuberculate Hoplogryon Ashmead. 



(type H. niiiiutissitnus Ash>l). 

 Metascutellum simple, unarmed... Qryon HaliJay (type G. viisellus Hal.). 



8. Metascutellum with a small spine or tubercle HopIogryon Ashmead. 



Metascutellum simple without a spine or tubercle Qryon Haliday. 



9. Abdomen long-oval, the first segment petioliform ; marginal vein very long... 10 

 Abdomen broadly oval, the first segment usually wider than long 13 



10. Mesonotum with parapsidal furrows II 



Mesonotum without parapsidal furrows 12 



11. Postscutellum with three spines ; antennae very long, filiform, pubescent. 



Trissacantha Ashmead. 

 Postscutellum with one spine ; antenna; with whorls of long hairs. 



Xenomerus Walker. 



12. Hind femora not swollen, the tibial spurs not developed, the basal joint of tarsi 



long, slender ; antennse long, filiform, the flagellar joints at least four times as 



long as thick, the third joint excised at base Prosacatltha Xces. 



Hind femora swollen, the tibial spurs developed, the basal joint of tarsi short, 

 stout; antennae filiform, the flagellar joints usually less than thrice as long as 

 thick Teleas Lati-eille. 



13. Postscutellum with a small spine or tubercle ; antennre filiform, the flagellar 



joints elongate Hoplogryon Ashmeaa. 



Postscutellum without a small spine or tubercle ; antennae filiform, the joints 

 scarcely longer than thick , Qryon Haliday. 



Subfamily IV. SCELIONIN.E. 

 In having the abdomen always distinctly carinated at the sides 

 this subfamily comes closest to the Teleasin^, but here the resemblance 

 ceases, the abdomen, except in a few cases, being much more elon- 

 gated and pointed, or fusiform, and extends beyond the tips of the 

 wings when folded. With a little knowledge of the forms the stu- 

 dent may at a glance recognize a species falling in this group, but 

 when in doubt the venation may always be depended upon to distin- 

 guish the group, being quite characteristic. The postmarginal vein, 



