62 BRITISH ICHNEUMONS. [Cremastus 



7. infirmus, Grav. 



Cremastus infirmus, Gr. l.R. m. lA'o; Holmgr. Sv. Ak. Handl. 1854, p. 22; 

 lib. cit. 1858, p. 110; Brisch. Schr. Nat. Ges. Danz. 1880, p. 178; Thorns. O.E. 

 xiv. 1452, t? ? . 



A small, elongate and slender species. Head strongly constricted 

 behind the eyes; vertex short, clypeus as long as broad, apically rounded 

 and, like the elongate cheeks, mouth and orbits, flavous. Antennae 

 extending beyond thoracic apex. Thorax immaculate black, finely and 

 alutaceously punctate, dull ; pleurae finely and closely punctate ; meta- 

 thorax rugosely punctate and apically a little produced, with the 9 areola 

 apically incomplete. Scutellum black. Abdomen strongly elongate and 

 black, or with the second segment or in $ second and third apically 

 rufescent ; terebra as long as abdomen. Legs fulvidous with hind coxae 

 and trochanters main'ly nigrescent, as also for the most part are the hind 

 tibiae, and sometimes the $ femora. Wings subhyaline, with stigma 

 piceous and tegulae pale flavous ; basal abscissa of radius but little longer 

 than submarginal nervure. Length, 7-8 mm. 



In size and outline this species strongly resembles A^cvierifis cmfias/oidis, 

 but is at once known therefrom by its aciculate second segment, the pale 

 orbits and relative length of the submarginal nervure with the basal 

 radius. 



Gottingen (Grav.). not uncommon in Sweden in July and August 

 (Holmgr.), Austria (Kirch.), Prussia (Brischke), France and bred from 

 Sierrhoptcryx hirsu/tlla (Gaulle) and from Psjchc calvdla by Fallou 

 (Giraud, Ann. Soc. Fr. 1877, p. 403), Belgium in July and August (Tos- 

 quinet). It has been captured with us at Bolt Head in Devon on 28th 

 June (Bignell) and bred "from two-year-old acorns containing Carpocapsa 

 spkndaiia'' (Entom. 1881, p. 140). It must be anything but common on 

 the wing, however, for I have seen but few specimens and no males ; 

 females have been most kindly given me from Guildford in Surrey on 

 22nd August, iQOO (E. A. Butler), Shere in the same vicinity (Capron), 

 Ely found on 23rd July, 1903 (Cross) and Heacham in Norfolk on 27th 

 July, 1903 (E. A. Elliott). 



