50 Journal New York Entomological Society. [VoLvii. 



Clypeus anteriorly produced into a triangular tooth ; first transverse cubitus 

 wanting or evanescent, maxillary palpi 4-jointed. . . . Alethoca Latreille. 

 Hypopygiuni tridentate, the median tooth longer than the lateral. 



Clypeus anteriorly with a median emargination ; maxillary and labial palpi 

 very short, both 3-jointed; marginal cell truncate at apex. Iswara Westw. 

 Clypeus anteriorly rounded not emarginate ; maxillary palpi 4-jointed, labial 

 palpi very short, 3-jointed ; marginal cell acute at apex. 



(Type /. Koebelei K'iwyi.) Iswaroides As/ini., g. n. 



5. Hypopygiuni nanow, briefly dentate or trilobed at apex ; clypeus ovate, subemar- 



ginate or with a triangular impression at apex ; maxillary palpi 6-, labials 4- 



jointed Elaphroptera Giierin. 



Hypopygium not narrow, ending in three strong teeth, the middle tooth a little 

 longer than the lateral. 

 Clypeus produced and anteriorly rounded or sub-truncate ; maxillary palpi 



4 jointed Ariphron Erichson. 



Clypeus prominent, narrowed, at apex anteriorly bidentate. Ornepetes Guerin. 

 Hypopygium produced into a distinct spine or with an aculeus. 

 Metathorax neither short nor abruptly sloping from base to apex. 



Metathorax truncate behind, the angles acute ; hypopygium small, hidden, 

 but produced at apex into a long stout prong which curves upwards. 



Khagigaster Guerin. 

 Metathorax not truncate behind, a little longer than the mesonotum ; hypo- 

 pygium projecting and ending in a short aculeus, the pygidium transverse 



with some transverse rugse toward the apex Entelus IVeshv. 



Metathorax very short, abruptly sloping from base to apex ; hypopygium large, 

 triangular and ending in a small spine which extends beyond the pygidium. 

 Maxillary palpi 6-jointed, the joints not short, subequal ; labials 4-jointed. 



Thynnus Fabr. 

 Maxillary palpi 6-jointed, joints I-3 minute, 4-6 very long. 



Trachynomyla Guerin. 



6. Third submarginal cell shorter than the second 8 



Third submarginal cell longer than the second. 



Mandibles narrow, curved, the teeth acute ; abdomen oblong, subcylindrical, as 

 long or longer than the head and thorax united 7 



Mandibles broad, the apical tcoth large, obtuse ; abdomen, oval, shorter than the 

 thorax ; claws cleft Ambly soma Wcstw. 



7. Hypopygium not prominent, obtuse at apex ; clypeus somewhat produced, and an- 



teriorly rounded, not excised ; maxillary^ palpi 6-jointed, joints I-3 united, about 

 half as long as 4-6 ; labials 4-jointed, joint I not longer than 2-3 united. 



Anodontyra Westw. 

 Hypopygium .somewhat prominent, narrow, truncate at apex ; clypeus ovate, sub- 

 excised or triangularly emarginate anteriorly ; maxillary- palpi 6-jointed, joint I 

 short, the following subequal ; labials 4-jointed, joint I shorter than 2-3 united. 



Elaphroptera Guh-in. 

 Hypopygium broader, subtriangular or .subc^uadrate, obtuse or truncate at apex. 

 Clypeus strongly produced anteriorly, the apical margin truncate or slightly 

 rounded ; maxillary palpi 5-, labials 4-jointed Eirone M'estw. 



