Pezoviachus?^ BRITISH ICHNEUMONS. I99 



tubercles ; post-petiole broad and transverse ; second segment with cpi- 

 pleurae narrow and spiracles small, far from the margin ; terebra as long 

 as the basal segment. 



Head black, with the palpi piceoiis ; mandibles red and apically piceous. 

 Antennae black or piceous, with apex of scape and extreme base of 

 flagellum fulvous. Thorax normally l)lack, rarely castaneous or dull 

 testaceous. Abdomen black, with the basal segment often more or less 

 testaceous. Legs piceous, with the coxae and trochanters black and the 

 femora, tibiae and tarsi more or less flavous- marked. 



(J. Winged. Vertex not narrow ; antennae elongate and sub-setaceous ; 

 mesonotum convex and short ; mesosternum saccate ; epicnemia slender. 

 A\'ings sub-hyaline with the stigma broad and basally white ; nervellus 

 strongly antefurcal. Abdomen not punctate, smooth and shining, and 

 diffusely pubescent ; post-petiole cjuadrate. Petiolar area nitidulous and 

 as long as the metanotum. 



Black, with the second segment entirely pale or only at base and apex. 

 Length, 3-4 mm. 



Forster says the female is very like P. festinans, but may be distinguished 

 by the more slender antennae and longer metathorax. 



Bridgman writes (Trans. Ent. Soc. 1881, p. 155), " Mr. Billups has taken 

 at Deal, in August, a small black Pezoinachus, which I believe to be this 

 species." Subsequently (Trans. Norf. Soc. 1893, p. 616) he records it from 

 Earlham, Eaton and Brundall, near Norwich ; and Bignell (Entom. 1882, 

 p. 45) says it has been bred at Liverpool parasitically from the galls of 

 Aulax hieracii on Hieracium umbellatum. It appears to be restricted to 

 sandy places, since I have only found it on the sandy cliffs at Gorton and 

 Southwold in August, and in sandy places about Brandon, in Suffolk, in 

 early June. 



18. spinulus. Thorns. 

 Pezomachus spiiiula, Thorns. Opusc. Ent. .\. p. 1006, S 9 . 



Head much broader than thorax ; cheeks not longer than width of 

 mandibles ; genal sulcus deep ; vertex deeply emarginate ; clypeus trun- 

 cate at apex ; mandibles not tuberculate at base, narrow at apex ; eyes 

 large. Antennae filiform ; first and second joints of flagellum equal in 

 length ; fifth longer than wide. Meso- and meta-thorax equal in length ; 

 no trace of scutellum ; metathorax glabrous ; petiolar area nearly vertical, 

 its basal costa indicated by two very small dentiform projections. Abdomen 

 closely and finely punctured and pubescent ; first segment moderately 

 broad ; spiracles not projecting ; terebra almost shorter than first segment. 



Black ; apex of scape and base of flagellum, and legs more or less, pale- 

 marked. Length, 4 mm. 



The 9 differs from P. tiii^ri/us in the absence of the scutellum, the 

 vertical petiolar area with small spines at its base, narrower petiole, longer 

 terebra and darker legs. Male apterous. Differs from that of P. nigritus 

 in its more robust form, darker legs and in the absence of wings. 



This species was brought forward as British by Bridgman on the 

 strength of a single male so named by Professor Thomson (Trans. Ent. 

 Soc. 1886, p. 341), which was taken in the neighbourhood of Norwich. 



