86 Rev. T. A. Marshall's monograph of 



iv. Hetekogamus, Wesm. 



Wesm., Nouv. Mem. Ac. Brux., 1838, p. 120. 



This genus is not of equal value with the other genera 

 of the present subfamily. It was made a subsection of 

 Ehogas by both Haliclay and Wesmael, differing only 

 from that genus as follows :— 



Second cubital areolet so narrow that the 1st abscissa of the 

 radius is made longer than the 2d ; abdomen of the J dilated from 

 the base to the apes of the 3d segment, with rectilinear sides ; 4th 

 and following segments retracted under the 3d, only the extreme 

 apex protruding ; in the ^ , however, the 4th segment is half as 

 long as the 3d, and the 5th and following retracted ; the antennae 

 of the ? are ringed with white (as in no other British Braconid, 

 unless Helcon annulicornis, Nees, be indigenous) ; those of the 3' 

 are more slender in proportion (remarks Haliday) than the antennae 

 of any other Ichneumonideous insect. 



1. Heterogamus disjjar, Cur. (PI. IV., figs. 1, 2). 



Rogas dis2)ar, Cur., B. E., dxii. ; Hal., Ent. Mag., iv., 

 103, ,3^ ? ; S. V. Voll., Pinac, pi. iv., f. 3 ( ? , 

 with details of antenna). 



Heterogamus cri/jiticornis, Wesm., Nouv. Mem. Ac. 

 Brux., 1838, p. 120, <? ? . 



2 • Kufo-testaceous, granulated ; thorax more or less, and apex 

 of the abdomen, fuscous; antennae stout, tricolorous; fore wings 

 cinereous, hind wings hyaline. (J testaceous ; thorax more or less, 

 and abdomen at the apex, fuscescent ; antennae very slender ; wings 

 hyaline. (^ 5 . Stigma bicolorous. Length, 2^ ; wings, 44 lines. 



5 . Variable in colour ; testaceous, with the vertex and occiput 

 fuscous, or with the head, thorax, and abdominal segments after 

 the 2d, blackish ; antennae 89 — 40-joiuted, testaceous for ^ of their 

 length, then fuscous, then white, afterwards fuscoxis to the apex ; 

 the white ring occupies 5 — 7 articulations ; palpi, trochanters, and 

 anterior coxae, whitish ; mesothoracic sutures effaced ; metathorax 

 rugulose, elongate, cylindrical, truncate and bidenticulate at the 

 apex ; abdominal segments 1 — 2 punctato -rugulose, longitudinally 

 carinated ; segment 3 thickly punctulate ; legs slender, femora 

 often fuscous at the apex ; stigma fi;scous, yellow at the base ; a 

 white streak or spot in the 1st cubital areolet, and the portion of 

 the cubital forming its lowest side effaced by another white streak. 



(J. Antenna; 42 — 43-jointed, fuscous, the two first joints testa- 

 ceous ; variable in colour, the vertex, occiput, sides of the Uieso- 



