BRITISH ICHNEUMONS. 273 



This species may be known from A. dispar by its capital and thoracic 

 markings, the more strongly punctate frons and the conformation of the 

 antennae. 



Bridgman took the female, at Earlham, near Norwich, in September, 

 1877, but did not subsequently meet with it ; I swept two females, at dusk, 

 in Bentley Woods, on 20th September, 1897. It has a wide continental 

 distribution, and the female is said to hibernate. 



5. dispar, Wesm. 



Ichneumon ischiomelintis, var. I, Gr. I. E. i. 60S, i. Aet/iecents dispar, Wesm. 

 Nouv. Mem. Ac. Brux. 1844, p. 203 ; Bui. Ac. Briix. 1848, p. 327 ; Ilolmgr. Ichn. 

 Siiec. iii. 414 ; Thoms. O. E. xv. 1639 ; Berth. Ann. Soc. Fr. 1896, p. 364, 6 9 . Var. 

 A. frontatiis, '^tsm. Nouv. Mem. Ac. Brux. 1844, p. 205, ?. 



This species so closely resembles the preceding as to require no detailed 

 description. From the remainder of the genus both sexes may be at once 

 known by the shining, sub-obsoletely and sparsely punctate frons, the 

 excavated apices of the cheeks, which are dilated below the mandibles with 

 the oral costa reflexed, the short notauli, discreted and sub-parallel petiolar 

 area, costulae emitted from before the centre of the areola, the centrally 

 smooth and shining post-petiole, and by the nervellus being intercepted 

 nearly in its centre. The ^ has the scape impressed and broadly dilated 

 basally, a deeper impression at the base of the second segment, and its 

 hind legs are darker, having only the femora basally and tibiae sometimes 

 entirely rufescent. The $ bears a conspicuous semi-rotund dentiform 

 cristula beneath the hind coxae, its antennae are tricoloured, the basal 

 segment entirely black, the post-annellus longer than broad, hind legs stout, 

 with the base of the coxae and apices of femora and tibiae black. 



From A. discolor, the black clypeus and scape of the $ , entirely black 

 thorax, rarely stramineous coxae, which are often basally infuscate, man- 

 dibles black in ? and centrally red in S , will distinguish it. 



The var. frontatus differs in the absence of a pale flagellar band. 

 Wesmael also mentions a variety of the $ with two apical scutellar dots 

 and the mandibles white, which Berthoumieu has named albipictiis. 



This species is common in Norfolk, and Bignell took it at Egloskerry, 

 near Launceston, towards the end of July. I found the female hibernating 

 in a tuft of Aim caespitosa, in Guestling AVood, near Hastings, in April, 

 and the male at Dunwich, in Suffolk, early in August. It is widely dis- 

 tributed on the Continent. 



DICAELOTUS, Wesmael. 



Wesm. Nouv. Mem. Ac. Brux. 1844, pp. 165 et 175. 



Head not tumidous ; vertex and cheeks broad but not buccate ; frons 

 convex, transversely impressed ; epistoma broader than long ; clypeus 

 very broad and very short, distinctly discreted, shining and sparsely 

 punctate, its apical margin entire, not foveate, smooth, mutic, straight or 

 very broadly rounded ; mandibles somewhat narrow, with the lower 

 margins entire and teeth of nearly equal length. Flagellum stout, filiform; 

 scape sub-cylindrical, hardly excised apically. Thorax stout ; notauli 

 distinct, of variable length ; mesosternum transverse, with its lateral sulci 



