Pezomachus.'] BRITISH ICHNEUMONS. I93 



costa somewhat strong throughout, centrally high and broadly curved ; 

 apophyses small and acute. Scutellum wanting. Abdomen moderately 

 closely and evenly punctate and pubescent to the apex ; petiole slightly 

 and post-petiole more distinctly explanate, with the sides divergent and 

 spiracles only slightly though visibly projecting ; terebra (in the typical 

 form) only about half the length of the basal segment. 



Head dark red, with the frons and occiput centrally piceous. Antennae 

 red-yellow, with the extreme ajiex infuscate. I'horax, abdomen and legs 

 uniform rufo-testaceous, with only the terebra and apical tarsal joint 

 piceus. Length, 3-4 mm. 



The smaller examples strongly resemble P. corruptor, but the basal 

 flagellar joint is not longer than the second, and the head is usually red. 



Brischke has bred this parasite from Cuculia arge/ika, and mentions 

 a variety with the terebra as long as the first segment and the abdomen 

 infuscate. 



Bridgman brought this species forward as British (Trans. Ent. Soc. 1887, 

 p. 365) on the strength of two females in Champion's collection, which he 

 says differ from Forster's description in having the terebra almost as long 

 as the basal segment and, in one example, the anus infuscate. Piffard 

 has several times taken it at Felden in Herts., Miss C'hawner in the New 

 Forest, Willoughby Ellis at Clacton in Essex, and Bloomfield at Guestling 

 in Sussex. I have once swept it at dusk, in the Bentley Woods, in 

 October. 



10. vulnerans, Forsf. 



Pezomachus agilis, Gr. I. E. ii. S97 (part). /'. vulnerans, Forst. Wiegm. Arch. 1850, 

 p. 189, 9 . 



Antennae with first joint of flagellum scarcely longer than second ; fifth 

 scarcely longer than wide. Meta- only a little longer than meso-Uiorax ; 

 slope oblique ; ridge very strong, the projections sharp and conspicuous. 

 Abdomen closely punctured and pubescent ; first segment only slightly 

 widened ; spiracles not projecting ; terebra decidedly longer than first 

 segment. 



Head, thorax and abdomen black ; antennae with apex of second and 

 base of third joints yellow. Legs red-yellow ; femora, apex of middle and 

 hind tibiae and the hind coxae, brownish ; last tarsal joint and claws red- 

 yellow, like the rest of tarsi. Length, 3 mm. 



Said to be at once distinguished from all others of this genus by the 

 long terebra, strongly acuminate apo[)hyses, and by the colour of the last 

 tarsal joint and claws. Introduced as British by Bridgman (Trans. I'^nt. 

 Soc. 1886, p. 342) on the strength of four females captured at Headley 

 and Reigate. 



II. canaliculatus, Forst. 



Pezomaihus hoitensis, var. i, Gr. I. E. ii, 90S, cxcl. i, . P. catialiculatus, Eursl. 

 Wiegm. Arch. 1850, p. 229, 9. 



Head dull ; antennae with joints one and two of flagellum e(]ual ; fifth 

 scarcely longer than wide. Meso- and meta-thorax ecjual, latter with deep 

 longitudinal impression, which is less distinct on former ; metathoracic 

 costa sub-obsolete above, more distinct at sides, but not prominent below. 



o 



