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



Basal segment of the abdomen normal, without a horn ; mesonotum with distinct 

 furrows; club of antennae 4-jointed, the funicle joints slender, cylindrical. 



Acerota FSrster. 



8. Tarsi 5 -jointed 9 



Tarsi 4-jointed. 



Antennae lo-jointed, with whorled hairs Iphetrachelus Haliday. 



9. Antennae lo-jointed 10 



Antennae 9-jointed, with whorled hairs Allotropa Forster. 



lo. Front wings with a basal nervure il 



Front wings without a basal nervure of the submarginal vein ending in a knob. 12 

 li. Mesonotum with two faint furrows or with distinct fuiTows. Antenna sub- 

 clavate, moniliform, the first joint of the funicle very minute, the second some- 

 what larger, the following to the tenth large, gradually enlarged; the last the 



largest, conical MetaclisiS Forster. 



Antennae filiform submoniliform, the first joint of the funicle very minute, the 

 second larger, thickened, curved, the third small, triangular, the following, 

 except the last, transverse-moniliform, the last conical. ..Monocrita Forster. 



12. Lateral ocelli nearer tlie inner margin of the eye than to the front ocellus 13 



Lateral ocelli nearer the front ocellus than to the inner margin of the eye ; pedicel 



obconical, rather long ; club of antennae 4-jointed Isostasius Forster. 



13. Mesonotum with faint furrows ; antennae moniliform, pubescent, the first two 



funiclar joints nearly equal, the second somewhat curved, the third small, tri- 

 angular, the four following moniliform, the last conical. 



Inostemma Haliday. 



Mesonotum with two distinct furrows ; antennae filiform, pubescent, the second 

 funicular joint long, cylindrical, longer than the first, the third shorter than the 

 first, the following oval, the last about thrice as long as thick. 



Acerota Forster. 



Subfamily II. PLATYGASTERIN.'E. 



To this subfamily belong all species with veinless wings, all the 

 veins being wholly gone or obliterated, except sometimes the sub- 

 marginal vein basally ; if present it is, however, never knobbed, as in 

 the Inostemmince. 



The genera recognized in this group are much more numerous and 

 more difficult to separate than those in the previous subfamily, but it 

 is believed that the characters made use of in the table below will be 

 sufficient for their recognition. 



Table of Genera. 



1. Females.. 2 



Males 18 



2. Scutellum lengthened, spined, or when shortened, compressed at the sides and 



furnished with an awl-shaped thorn, spine or tubercle 3 



Scutellum not lengthened semicircular, either fiat or convex, cushion-shaped, or 

 cupuliform, and always unarmed 9 



