igo BRITISH ICHNEUMONS. [Fezoniachus. 



P. myrmecirius in the sub-opaque, densely punctured and fulvous-haired 

 segments of the abdomen, and in the depressed, shining margin of 

 segments two to six. The male may be distinguished by the longer 

 antennae, broader and less strongly punctured abdomen, which is centrally 

 red. 



This species was introduced as British by Desvigne.s, in 1856, but I 

 have heard of no specific records. It is said to be a parasite of Formica 

 riifa on the Continent (Kirchner and Wasmann). 



6. costatus, Bridg. 

 Pezoinachus coslattis, Bridg. Trans. Ent. Soc. 1886, p. 341, ?. 



Head large and slightly oblique behind the eyes ; not very closely punc- 

 tate with short pubescence, which is closer on the clypeus ; mandibular 

 teeth of equal length. Antennae stout, about three-quarters the length of 

 the body ; the second flagellar joint rather longer than the first, which is 

 twice longer than broad ; fifth very slightly longer than broad. Thorax 

 very sparsely punctate and pubescent ; metanotum glabrous and scarcely 

 higher than, and about as long as, the punctate mesonotum ; petiolar area 

 sub-vertical and not short with no basal costa, but with an often obsolete 

 wavy costa running across its centre ; apophyses obsolete. Scutellum 

 indicated, broad and hardly discreted. Abdomen closely but very dis- 

 tinctly punctate and pubescent throughout ; basal segment sub-pyriform 

 and laterally margined with the post-petiole usually somewhat rounded, its 

 spiracles hardly or not at all visible ; terebra about as long as the basal 

 segment. 



Head black, with the mandibles and inner, and often frontal, orbits 

 clear red ; mandibular teeth deep black. Antennae with the basal half 

 red. Thorax and legs clear red. Abdomen black, with the two or three 

 basal segments red and the remainder broadly red -margined. Length, 

 4-5i mm. 



This species is very closely related to P. Kiesenweiferi, from which it 

 differs in its larger size, broader and much more distinctly punctate abdo- 

 men, stouter flagellum, which has the basal joint somewhat shorter than 

 the second. 



It was found not uncommonly about Norwich by Bridgman ; and has 

 occurred to Capron at Shere in Surrey ; Fiffard at Felden in Herts. ; 

 Chitty at Huntingfield in Kent, in August ; Bignell at Plym bridge in 

 Devon, early in August ; and to Fletcher, probably at Worcester. Bennett 

 has taken it at Camber in Sussex (Vict. Hist.) ; and at the end of July, 

 1904, I secured an example at the roots of Matricaria on the top of the 

 cliffs at Kessingland in Suffolk. 



7. rufipes, Forst. 



Pesolochiis rufipes, Forst. Wiegm. Arch. 1850, p. 104, 9 ; Pezomachus rifipes. 

 Thorns. O. E. x. 1002, 6 9. A aries, Forst. VViegni. Arch, 1850, p. 104, ? . P. 

 forticornis &\. ecarinatns, Fcirst. lib. cit. p. 135, 9 9- i^- melaitophonts, Furst. lib. cit. 

 1S51, p. 52, i. 



5 . Head dull, with short and diffuse pubescence ; peristomium broad, 

 mandibles long and stout ; clypeus discreted by a curved impression and 

 with no lateral foveae ; genal sulcus wanting. Antennae short, with the 



