Pezomac/ius.] BRITISH ICHNEUMONS. 215 



curve in the centre. Alidomcn moderately closely punctured and pubes- 

 cent throughout ; petiole somewhat narrow at base, longer than post- 

 petiole, which has parallel sides ; spiracles somewhat projecting. Terebra 

 scarcely as long as the first segment. 



Head black ; antennae red, infuscatc towards apex. Thorax red. 

 Abdomen with segments one to three yellow, the rest red-yellow ; segments 

 one to four with a fine brown transverse line near apex and darker apical 

 margin ; sheaths of terebra yellow, apically brown. Legs red. Length, 

 2f mm. 



This 9 differs from P. corntptor in the shorter metathorax, the shape 

 of the first abdominal segment, and in the colour of the sheaths of the 

 terebra, as well as in the more vertical peliolar area, the narrower and 

 more parallel-sided post-petiole, which has the spiracles more prominent, 

 and in the less distinctly punctate anus. 



? o . Apterous. Head black, palpi and mandibles testaceous, latter 

 apically black. Antennae pale red, hardly darker apically ; basal flagellar 

 joint slightly longer than second ; fifth twice longer than broad. Petiolar 

 area very high, its basal costa centrally truncate, laterally convergent ; 

 apophyses prominent ; mesonotum pale red, its pleurae and metathorax 

 piceous ; petiolar area red. Scutellum distinct. Abdomen densely punc- 

 tate throughout, slightly more diffusely at apex ; three basal segments pale 

 red, the first basally piceous, and the third with a piceous basal fascia ; 

 first segment with petiole little explanate and the post-petiole parallel-sided, 

 with distinct but not prominent spiracles. Legs fulvous. Length, 3 nmi. 



This male is but tentatively here placed, since it appears to bear to 

 P. ochraceiis much the affinity that P. dysalottis does to P. corniptor. 

 Bignell captured it at Bickleigh in the middle of September, and it has 

 been bred from Microi:,aster cocoons (Entom. 1881, p. 139). 



If this insect really be but a form of P. corrupter, which I do not credit, 

 it is very much rarer than the typical one, for I have never met with it in 

 Suffolk. Bridgman, however, says it is common in Norfolk ; Fitch has 

 found it at Maldon in Essex ; Capron in Surrey ; and Butler at Battle in 

 Sussex. I, too, have found it in a tuft of Aira caespiiosa at Brede, near 

 Hastings, late in March ; and swept it at Hursthill, in the New Forest, 

 early in August ; Donisthorpe has given me an example captured at 

 Dorking, in 1894; and Evans took it at Liveravon, in Linlithgowshire, in 

 February, 1903. 



37. modestus, Forst. 



Pezoiiiachus vaga7is, varr. i cl 4, Gr. I. E. ii. 891, 9. P. /itoJcslns, Fiirst. Wiegm. 

 Arch. 1850, p. 154, 9- P. sfriolaltis, Ratz. Ichn. d. Forst ill. 146, 9. P- providus, 

 Forst. Wiegm. Arch. 1850, p. 187, 9. (?) P- agekies, Forst. he. cit. 1S51, p. 51, <J . 



Head normal ; first flagellar joint slightly longer than the second, the 

 fifth longer than broad. Meta- somewhat longer than the meso-thorax, 

 compressed laterally and therefore narrow discally, somewhat shining with 

 very scanty pubescence. Abdomen closely punctate and pubescent, 

 especially basally ; first segment with no projecting tubercles ; terebra 

 about as long as the basal segment. 



Head black ; antennae piceous, with the base of the first flagellar joint 

 dull red-yellow. Thorax pale brown. Abdomen black or black-brown, 



