INTRODUCTORY PAPERS ON ICHNEUMONID^. 83 



^THECERus, Wesm. 



A. Apex of cheeks behind the mandibles incurved. 



Segments 1st to 4th and legs red ; apex of hind fomora and tibiae 

 black ; antennae red, apex black ; hind coxae furnished with a 

 small tooth. (Female.) 



Middle of abdomen red or red-banded ; front femora and tibiae, and 

 hind tibiae, red. (Male.) - - - nitidus, 2| — 3 Hues. 



B. Apex of cheeks behind the mandibles straight. 



Segments "^nd to 4th, and legs, fulvous ; apex of hind femora, base 

 and apex of hind tibiae, black ; antennae subtricoloured. (Female.) 



longulus, 2^ lines. 



See Trans. Ent. See. Lond., 1881, pp. 149, 150. 



Oronotus, Wesm. 



Segments, 1st to 4th, and legs, fulvous ; front coxae and trochanters 

 pale ; apex of hind femora, base and apex of hind tibiae, black ; 

 2nd segment of male with two black marks ; antennae of female 

 slender and white-ringed (male and female). 



] . binotatus, 3^ — 4 lines. 



Gravenhorst described his single male as a Phygadeuon. This 

 species is neither the Ichneumon binotatus of Stephens (111. Brit. 

 Ent, Mand. vii. 147) nor of Desvignes (Cat. Brit. Ichn., p. 23). 

 Both sexes are beautifully figured by Vollenhoven in ' Pinaco- 

 graphia' (pi. 86, figs. 8, 9 & 9a), where he remarks on the general 

 facies of this rare species having a certain resemblance to an 

 Anomalon ; its slender, compressed, abdomen reminds one of 

 Limerodes. Vollenhoven conjectures that it is parasitic on one of 

 the grass-feeding Leucaniidce. 



IscHNus, Grav. 



A. Thorax red, variegated with black and yellow ; abdomen black ; legs 



red (male and female). - - 2. thoracicus, 2 — 2-^ lines. 



B. Thorax not red ; scutellum onlj', sometimes red. 



a. Scutellum, legs, and middle of abdomen, red (female). 



1. nigricollis, 3 lines. 



b. Scutellum, legs, apex of hind tibiae, tarsi and abdomen, black (male). 



1. nigricollis, 3 lines (s, /). 



c. Scutellum black ; 2nd and 3rd segments towards the apical margins at 



the sides, castaneous ; legs red ; apex of hind tibiae and tarsi 

 fuscous (male). 3. nifipes, 4^ lines. 



This genus, as restricted by Wesmael, contains but one 

 Gravenhorstian species {thoracicus) ; it is figured in Vollenhoven's 

 'Schetseu' (pt. i., pi. i., tig. 3). The British species of Ischnus 



