176 BRITISH ICHNEUMONS. 



A black species, with the abdomen mainly red. Head immaculate, 

 cheeks and temples hardly dilated. Antennae black ; of ? setaceous, 

 slender, white-banded with the tenth flagellar joint sub-quadrate ; of S 

 with the basal flagellar joints sub-dentate. Thorax black, rarely with a 

 white callosity at radix of 3 ', metathocax punctate ; areola sub-quadrate ; 

 costulae wanting ; aj)ophyses obsolete. Scutellum black. Abdomen ellip- 

 tical, badious or castaneous with first and base of second segment black, 

 sometimes with first five or six segments infuscate or black-marked, rarely 

 entirely black in S ; post-petiole aciculate ; gastrocaeli somewhat large and 

 oblicjue, with the intervening space roughly striolate ; 3 with fourth 

 ventral segment not plicate. Legs normal, black ; anterior femora, tibiae 

 and tarsi, and sometimes all the femora in part, red or castaneous. Wings 

 sub-hyaline, stigma testaceous or piceous ; tegulae nigrescent. Length, 

 1 1- 14 mm. 



This is a widely distributed species on the Continent, and is probably not 

 uncommon in Britain. Gravenhorst tells us Hope took it, about Netley, 

 and that it is to be found, upon shrubs, in July. It used to be taken, in 

 June, at Coombe and Darenth Woods, and Stephens also records it from 

 the New Forest, where it has recently been captured by Miss Chawner, 

 The species is said to have been bred from Taeiiiocampa cruda, CucuUia 

 chamoinillae and Dianthaecia cucubali ; its female passes the winter in the 

 perfect state. 



II. repentinus, Grav. 



Ichneumon repentinus, Gr. Mem. Ac. Sc. Torin, 1820, p. 334 ; I. E. i. 467, i 9 ; 

 Ste. III. M. vii. 189. Ainhlyteles repentinus, Wesm. Bui. Ac. Brux. 1857, p. 403; Voll. 

 Pinac. pi. vii. f. 8 ; Berth. Ann. Soc. Fr. 1895, P- 5S4> i ^ • ^- nielanocastanus, var. 2, 

 Wesm. Nouv. M^m. Ac. Brux. 1844, p. 135 ; Holmgr. Ichn. Suec. ii. 267, synon. i ?. 

 Cteniclineuiiion repentinus. Thorns. O. E. xix, 2086, 6 ? . Var. Ichneumon menstrualis, 

 Gr. I. E. i. 532, i. 



Very like C. vielanocastanus, from which it may be known by the an- 

 tennae of the ? having all the flagellar joints longer than broad ; of the $ 

 not distmctly serrate and somewhat slender. Thorax black, with usually 

 two pale callosities at radix ; mesonotum strongly punctate and somewhat 

 dull. Scutellum, at least towards its apex, white. Abdomen castaneous, 

 basally black ; post-petiole not or hardly transverse. Legs black, front 

 femora and tibiae apically or internally stramineous ; hind tibiae more or 

 less rufescent basally or throughout. Length, 10-14 """^i- 



The variety mejistrualis has the three basal segments, as well as the 

 dorsum of the fourth and fifth, black. 



This species is common on the Continent, where the female hibernates ; 

 Stephens records it from Norfolk, but is not quoted by Bridgman in his 

 county list. 



12. mesocastanus, Grav. 



Ichneumon mesocastanus, Gr. Mem. Ac. Sc. Torin, 1820, p. 334 ; I. E. i. 469, i . 

 Amblyteles niesocastanus, Wesm. Nouv. Mem. Ac. Brux. 1844, p. 135 ; Bui. Ac. Brux. 

 1855, p. 409; Holmgr. Ichn. Suec. ii. 266; Berth. Ann. Soc. Fr. 1895, p. 589, S ?. 

 Ctenichneumon mesocastanus. Thorns. O. E. xix. 2087, i 9 ■ Var. Ichneumon vesper- 

 tinus, Christ, Hym. 342, pi. xxxiv., f. 5; Gr. I. E. i. 234; Ste. 111. M. vii. 154, J; 

 Wesm. M6m. couron. Ac. Belg. 1859, p. 27. /. niteiis, Gr. I. E. i. 476, 9 . 



A red and black species, clothed with whitish pubescence. Head 

 narrowed behind the eyes, black ; $ with facial orbits often pale. An- 



