2l8 BRITISH ICHNEUMONS. {Pezomachus. 



Head black ; mandibles and palpi red. Antennae dark, dull red-brown. 

 Thorax and legs red ; femora black. Abdomen with first segment red, 

 the rest black, sixth and seventh sometimes with a fine pale yellow posterior 

 margin. 



$ . Sub-opaque, finely granulate ; head rather stout, slightly contracted 

 behind the eyes, rather wider than the thorax. Antennae as long as the 

 body ; first joint of the flagellum about four times as long as wide, longer 

 than the second. Clypeus somewhat distinctly separated from the face, 

 rounded at the apex ; space between the eyes and mandibles about equal 

 to the width of the base of the latter ; face transverse, rather prominent in 

 the middle. Thorax longer than high ; notauli faintly impressed in front; 

 scutellum somewhat gibbose, suture at the base finely consute ; meta- 

 thorax a little longer than wide, with only a faintly defined areola, which 

 is about as broad as long ; the metanotum separated from the petiolar 

 area by an angulated ridge. Abdomen elongate-ovate ; first segment 

 rather narrow, without projecting spiracles, only about one-fourth narrower 

 at the base than at the apex, sides more parallel and the base wider than 

 usual ; second segment about as long as wide ; remainder transverse ; apex 

 of third widest and as wide as the thorax. Legs slender. Wings with a 

 pentagonal areolet ; its outer nervure absent ; cubital nervure with one, 

 and recurrent nervure with two, clear spots ; stigma triangular, about one- 

 third longer than wide ; radial cell rather short, outer nervure slightly 

 curved, exterior inferior angle of discoidal cell rectangular ; transverse anal 

 nervure antefurcal, distinctly divided one-third below the centre. 



Black ; apex of first segment and base of third narrowly yellowish red, 

 the second yellowish red, with a large black central blotch, leaving only a 

 narrow pale border all round the segment. Legs black ; base of front 

 tibiae and joints of tarsi piceous ; middle and hind legs, apex of tro- 

 chanters, base of tibiae, and base of joints of tarsi piceous. Tegulae and 

 nervures blackish brown. Stigma black, white at its base. Wings slightly 

 fuscous, with a white patch just below the stigma. Length, 4|-6 mm. 



I am certainly of the opinion that P. lustrator is an apterous dimorphic 

 form of this male, and quite possibly P. secretus is the same ; both have 

 been recorded from Britain, though I have not met with them, and no 

 localities are forthcoming. 



Both sexes bred by Mr. B. A. Bower from British Coleophora vibicella 

 (Bridg. loc. cit.). 



40. tristis, Forst. 



Pezomachiis Iris/is, Forst. Wiegm. Arch. 1850, p. 153, 9. P- violentus, Forst. 

 ///'. cit. 1 85 1, p. 59, i . 



? . Flagellum with the basal joint slightly longer than the second ; the 

 fifth longer than broad. Meta- rather longer than the meso-thorax ; petiolar 

 area nearly vertical, its basal costa weak, though slightly stronger laterally. 

 Abdomen moderately closely punctate and pubescent ; basal segment 

 gradually explanate throughout, with the sides straight and the spiracles 

 not or only slightly prominent ; terebra a little shorter than the basal 

 'segment. 



Head piceous ; antennae fulvous, slightly darker only towards the apex. 

 Prothorax dark red ; meso- and meta-thorax piceous, dorsally rufescent. 



