I06 BRITISH ICHNEUMONS. [Fanargyrops. 



5. tenuis, Grav. 



Cryp/iis tenuis, (\x. I. K. ii. 544, 6 ; Tascli. Zeits. Clcs. Nat. 1S65, p. 89, 6 9 ; Brisch. 

 Schr. Nat. (ies. Dan/.. 1SS2, p. 337,9. Heinile/es frat^ilis, (jr. I. E. ii. 828; Tasch. 

 Zeits. Ges. Nat. 1S65. p. 133, 9 ; Hridjj. Trans. Ent. Soc. 1S89, p. 416, $. H./ormosus, 

 Desv. iil>. lit. ser. H. v. 211,6 9. 



Head black with the face densely pube.scent and not narrowed towards 

 the mouth ; palpi pale stramineous, mandibles centrally caslaneous ; 

 clypeus not discreted, apically truncate. Antennae slender, longer than 

 half the body,- filiform, infuscate and basally rufescent beneath ; flagellar 

 joints cylindrical throughout ; 6 vvith the basal joints stramineous, and the 

 remainder testaceous, beneath. Thorax immaculate ; notauli of c^ deeply 

 impressed and extending almost to the scutellar fovea ; nietathorax 

 elongate with recumbent pubescence and incomplete areae ; areola ill- 

 defined, hexagonal ; petiolar area discreted, strongly oblique and not 

 separated from the metanotum ; spiracles circular. Scutellum black. 

 Abdomen oblong-ovate, as broad as the thorax, black ; ba.sal segment 

 sub-linear with the post-petiole gradually dilated towards the pale apex, 

 sub-glabrous, nearly parallel-sided and centrally sub-canaliculate, broader 

 in $ ; second segment shining, obsoletely punctate, red and basally black ; 

 third red with lateral black marks and isolated punctures • fourth black 

 and discally castaneous ; terebra nearly as long as the abdomen. Legs 

 slender, red ; the anterior pale fulvous with the coxae and trochanters 

 paler, sometimes whitish ; hind ones testaceous, with the tarsi, apices of 

 femora and base and apex of tibiae infuscate ; i$ with the centre of the 

 hind tibiae distinctly red. Wings somewhat large ; stigma piceous, radix 

 and tegulae white ; areolet externally sub-incomplete. Length, 6-7 mm. 



Desvignes' species appears to be certainly synonymous with those of 

 Gravenhorst, as indicated by Bridg.-Fitch ; its terebra, however, is said to 

 be hardly so long as half the abdomen, and neither Gravenhorst nor 

 Taschenberg noted the apically pale post-petiole, which is often immacu- 

 late ; the terebra is, actually, about two-thirds the length of the abdomen. 

 It is figured in Blackwall's " History of Spiders," pi. xii. fig. BB, and I 

 have examined Desvignes' types in the British Museum. 



Fred. Smith tells us (Trans. Ent. Soc, ser. H. v. p. 209) that he bred 

 both sexes somewhat freely, together with Pezomackus fasciatus, P'ab., with 

 which it appears to have no connection, from the snow-white, mud-coated 

 nests of the common field spider, A^roeca ( Agelena) brunnea, Bl. ; never 

 more than a single parasite was raised from each nest, which would appear 

 to supply more than its needs since, in every instance, four or five spiders 

 also emerged from the same nest ; he found the larvae still living in the 

 nests in July.^ I possess two $ $ and three ? ? bred together, possibly 

 from a Tenthredinid larva, by Miss Chawner at Lyndhurst in the New 

 Forest. 



This species is said to occur in May, and to be generally distributed in 

 Norfolk in June and July, where also it has been bred from spiders' nests. 

 Bignell bred it in Devon from the egg-bag of Agelena bninnea in mid- 

 August ; and Marquand has taken it in the Land's End district. Bridg.- 



1 " Notes on the Economy of the Ichneumons constituting the Genus Pezomachiis of Gravenhorst, 

 and Observations on Pezomachiis fasciatus, by Frederick Smith, Esq. ; with a Description of a New 

 Species oi Hemiteles, by Thomas Desvignes, Esq." Read July 4tb, 1S59. 



