Cryptus.] BRITISH ICHNEUMONS. 3I3 



12. Dianae, Gmv. 



Cryptus Dianae, Cr. I. E. ii. 545, excl. <? el var. 3 ; Ste. 111. M. vii. 2S7 (part) ; 

 Tasch. Zeits. Ges. Nat. 1865. p 84, ? ; Thorns. O. E. v. 482 et xxi. 2352, <? ? . 

 C. gracilicornis, Gr. I. E. ii. 553, ? . C. steitoi;aster, Gr. lil>. cit. 529, i . \'arr. 

 C. leucostoiniis, Gr. lib. cit. 531, (5 ; C. spectator, Gr. ltl>. cit. 529, 6. 



Head triangular, epistonia prominent, frons excavate, sub- rugose and 

 dull above ocelli ; of S with palpi ferrugineous, base of mandibles, 

 labrum, transverse clypeal line and the internal orbits, of $ with cheeks 

 sub-compressed, either immaculate or with internal frontal and vertical 

 orljits narrowly white. Antennae very slender, setaceous ; of 9 generally 

 white-banded, of S nearly length of body. Thorax immaculate ; nieta- 

 notum with transverse costae distinct and longitudinally rugose ; apophyses 

 very distinct, spiracles elongate. Scutellum entirely black ; of male rarely 

 with testaceous dot. Abdomen of $ linear, much narrower than tiiorax, 

 of ? fusiform ; red, with base of first, apex of third or fourth, and the 

 following segments entirely, black ; basal segment of ? laterally curved ; 

 post-petiole deplanate, ol)soletely canaliculate, its posterior angles obtuse 

 and the S spiracles large and prominent ; terebra rather shorter than 

 abdomen. Legs red ; coxae and trochanters black, of ^ ^^'ith anterior 

 sparingly white-marked beneath ; apices in $ , most or whole in ^ , of 

 hind femora, of the spinulose hind tibiae and the hind tarsi, black ; S 

 with hind tarsi centrally ferrugineous, of ? sometimes flavous or uni- 

 colorously nigrescent, its onychii black. AVings usually distinctly clouded ; 

 nervelet present ; stigma usually ferrugineous, of $ sometimes testaceous ; 

 radix and tegulae dark, internal fenestra large ; areolet not large, obviously 

 convergent above ; nervellus intercepted far below centre. Length, 

 8-1 1 mm. 



Both sexes of this species may be known by the elongate epomiae, 

 fulvous post-petiole and femora and tibiae, and the black apices to both 

 the hind femora and tibiae. The frons is more roughly sculptured and 

 duller than C. obscurus, the cheeks are less buccate and the male petiolar 

 spiracles more prominent. 



Of the varieties, leucostomus has the scutellum, external orbits in part 

 and often the whole clypeus, flavidous ; the abdomen a[)ically compressed, 

 with the second segment black. Spectator has scutellum apically white, 

 the central segments castaneous ; coxae, trochanters and hind legs entirely 

 black, with radix and tegulae infuscate. Gracilicornis differs in having no 

 white flagellar band and the three apical seginents obsoletely paler at the 

 margin. Stenogaster has the coxae and trochanters immaculate. 



This species is said to have been not uncommon about London by 

 Stephens, and I have seen examples from Wellington College, Reading, in 

 June, taken by Hamm. It is recorded from Bawsey Heath in Norfolk, by 

 . Bridgman ; and from Essex by Harwood. Both sexes have been bred 

 froin Cidaria picata (Proc. S. Lond. Soc. 1896), and the var. leucostomus 

 from Trachea piniperda. But its headquarters a[)pear to be in the New 

 Forest, whence Miss Chawner and Adams have sent it to me, and where I 

 have found the female by no means rarely on Angelica sylvestris flowers in 

 the middle of August at Matley Bog, together with a specimen of the 

 male var. leucostomus. Morice lias given me the male from I'yrfurd, in 

 June. 



