ICHNEUJIONID.E. TEYJ HON'. 231 



Gekus XLV— TRYPHON, Fallen. 



Antennas slender or moderate, either as long as, or shorter than, the body, with 

 the apex more or less curved, in rare instances a little thickened in the 

 middle: head generally the width of the thorax, or rather narrower, rarely 

 broader, in 2 instances with a frontal horn : eyes ovate, or a little orbiculate, 

 more or less prominent : thorax gibbous, or somewhat globose : scittellum 

 convex, 3-angular, with the apex obtuse : wings moderate ; cellule 3-angular, 

 or suborbiculate, sometimes minute, and occasionally wanting; rarely 5- 

 angular ; the inner nervure of the exterior cubital areolet sometimes pro- 

 ducing the rudiment of the divisional nervure, which forms so prominent a 

 character in the Ichneumones adsciti : abdomen subsessile or slightly petiolated, 

 rarely sessile, oblong, or a trifle lanceolated, or subclavate ; the basal segment 

 channelled, the lateral tubercles generally placed beyond the middle ; in the 

 females the apex of the abdomen is slightly thickened, and at times a little 

 compressed : ovipositor very short, and slightly exserted ; legs mostly short 

 or moderate; in a few instances rather elongate and slender; in others 

 short, and with the femora thickened. 



Of all the genera of Iclineumonidas, none, perhaps, is composed of 

 more dissimilar subjects, so that it becomes extremely difficult to 

 draw the line of demarcation between many of them and those of 

 allied genera : one set of species is closely allied to the genus Bassus, 

 others to Mesoleptus, some again to Phygadeuon, and others to 

 Stilbonota ; in fact, the genus is, apparently, a magazine for placing 

 all strange species that will not readily assimilate elsewhere : from 

 amongst these discordant insects we are informed, by Mr. Curtis, 

 that the genus Cteniscus has been formed by Mr. Haliday, to 

 embrace Tr. 6-lituratus and its congeners : another genus might be, 

 with equal propriety, formed of Tr. elegantulus, a third from Tr. 

 insolens, &c., and will doubtless be eventually formed. 



§ I. Scutelhim and abdomen black, with the extreme edges of the segments 



frequently pale. 

 Sp. 1. niger, Niger, facie et tibiarum posticarum medio albo-testaceis, pedibus 



anterioribus rufis, trochanteribus stramineis, coxis nigris. (Long. corp. 4| — 



5 lin.; Exp. Alar. 7^—8 lin.) 



only, I have been enabled to verify his species, in many cases, as such, from 

 having been nearly as great a length of time (above 25 years) in accumulating 

 indigenous species, as the learned Professor was in collecting European ones ; 

 but the subject is of so great an extent, that although I may give a tolerable 

 epitome of the numbers found in this country, much remains to be performed. 



