PezomachusA BRITISH ICHNEUMONS. 201 



Sussex (Vict. Hist.). I took a single s[)eciiiicn of tiie female among decay- 

 ing reeds at Oulton Broad, in Suffolk, at the end of July, 1904; and 

 possess others from Chobham in July (ex coll. Marshall), and a long series 

 from Shere in Surrey (ex coll. Capron). Chitty has found it at Oxford in 

 October. 



21. formicarius. Fab. 



lihiu-iiiiion foniiitciriiis, Fah. S. I. ji. 441. Crypfits foniiicariiis. Fab. Piuz. 92. 

 Ptzo mat /ills formicarius, Cr. I. E. ii. 915 ; Fcirst. Wiejjm. Arch. 1850, p. II9; Voll. 

 I'inac. pi. xii. tig. 9; Brisch. Schr. Nat. Ges Danz. 18S1, p. 350, 9; Thorns. O. E. 

 X. 1004, i 9. Var. P. Ra/zelmrgi, P'iirst. Wiegni. Arcli. 1850, p. 119, 9. Hcmi- 

 iiiachus ovatiis, Bridg. Trans. Ent. Soc. 1883, p 158, S- 



$ . Head dull, closely an,d finely alutaceous, with somewhat scattered 

 punctures and short grey pilosity ; clypeus more coarsely punctate with 

 lateral foveae and a small apical tooth in the centre ; genal sulcus distinct. 

 .Antennae with the scape distinctly punctate ; basal flagellar joint scarcely 

 longer than the second ; the fifth rather longer than broad. Thorax finely 

 alutaceous, closely punctate and dull ; mesonotum very short, its basal 

 part bounded in a semicircle by a narrow transverse prominence between 

 the meso- and meta-thorax, and bearing a longitudinal impression ; meta- 

 notum very short with the petiolar area very large, nearly vertical and 

 apically rugose, with no basal costa ; apophyses obsolete and epicnemia 

 broad. Scutellum indicated by a narrow, transverse prominence. Abdo- 

 men finely and densely punctate and pubescent ; petiole very slightly 

 broader at apex than at base, with obsolete spiracles ; post-petiole very 

 much broader than apex of petiole and parallel-sided ; e[)ipleurae broad ; 

 terebra exactly as long as the basal segment, curved and somewhat broad. 



Head deep black, with palpi and mandibles piceous and the face often 

 rufescent. Antennae red from base to about the centre and thence 

 darker to the piceous apex. Thorax red with sometimes the mesonotum 

 and usually the metapleurae piceous. Abdomen with the ba.sal .segment 

 and rarely the remainder red ; usually with the second black, with a 

 somewhat broad translucent red apical margin ; the rest black and 

 apically rufescent. Legs rufo-testaceous ; the apical tarsal joint brownish 

 at the apex. 



$ . Finely and densely reticulate, opaque. Head narrow behind eyes ; 

 face slightly protuberant, sub-quadrate, a little longer than wide, sides 

 parallel ; cheeks not buccate. Antennae sub setaceous, about as long as 

 the insect ; first and second joints of the flagellum sub-equal, about four 

 times as long as wide. Thorax rather longer than high ; mesothorax 

 distinctly trilobed, the depressions reaching to the scutellum ; metathorax 

 sub-rugulose, short, without areae, its transverse costa present but feeble. 

 Abdomen with first segment short ; petiole scarcely longer than {)ost- 

 petiole, which is sub-quadrate, rather more than twice as wide as the 

 petiole ; spiracles very prominent. Abdomen oblong-ovate, rather wider 

 than the thorax, about as long as head and thorax ; second and remaining 

 segments transverse, apex of .second and third widest. Legs slender. 

 ^Vings slightly clouded ; stigma fuscous and broad ; areolet very small 

 and imperfect ; basal nervure oblique ; with trace of nervelet ; nervellus 

 divided about one-third from the bottom. 



Black ; mouth, base of antennae and legs red ; first segment red, base 

 and sides of the petiole dark brown, a fuscous stain across middle of post- 



