THE ENTOMOLOGIST. 



541 



Polyguotus. Last comes Platygaster, which formerly included 

 all the above genera, but Foerster does not mention any of 

 the species which it still retains. Platygaster Siphon of 

 Foerster, described and figured in one of his eai'lier works, 

 may be placed under Acerota. Thomson's synopsis of the 

 genera is here abbreviated ; it does not seem equal to that of 

 Foerster. 



A. Subcostal vein abruptly clavate before the 



middle of the wiug. Petiole of the female 



with a recurved horn at the base. - Inostemma. 



B. Wings with no subcostal vein. Abdomen of 



the female with no born. 



a. Anteunte in both sexes with a 4-jointed club ; 



funiculus sleuder; vertex of the bead 

 narrow, bordered. Ocelli nearly contiguous 

 to the eyes. Dorsal linos of the mesotborax 

 obsolete, or none. Scutellum with a slender 

 apical spine. Abdomen subsessile, convex 

 above ; first segment wholly, second at the 

 base, covered with thick gray down. - Stnopeas. 



b. Abdomen petiolated. 



* Head twice as broad as the compressed thorax. 



Club of the antennae 4-jointed. Scutehum 



with an apical spine. - - - Pcestopleuea. 



■'"^ Head not or bardly broader than the thorax. 



Scutum with obsolete dorsal lines. 



f Scutellum with no basal groove, parted from 



the scutum by a slight transverse line. 

 I Scutellum attenuated into an aciculaT spine. 



Abdomen almost orbicular in both sexes. - Leptacis. 



II Club of the antenna3 of the female 4-jointed; 

 two last joints connate. Scutellum pubes- 

 cent, conical, depressed. Abdomen woolly 

 at the base. . . . . Amblyaspis. 



If Scutellum with a distinct basal groove, parted 

 from the scutum by a rather deep trans- 

 verse line. ... - Ceratacis. 

 ■'-* Vertex of the head with a rim. Scutum with 

 two lines. Scutellum thickly pubescent 

 at the tip. - - - Triciiasis, Anopedias. 

 :;::;:•-;< Vcrtcx of the head rather thick, without a 

 rim. Scutum with two lines. 



IsocYBAS, Hypooampsis, Platygastkr. 



