BRITISH ICHNEUMONS. 209 



with the apical angles somewhat prominent and strongly obtuse ; gastro- 

 caeli normal, deeply impressed, with intervening space broader than centre 

 of post-petiole ; ventral fold on segments two to four flavous ; c? with 

 genitalia ferrugineous and the ultimate ventral segment obtuse. Legs 

 normal, black ; tarsi pubescent, though not setiferous beneath ; anterior 

 tibiae in part red ; 6 with anterior femora, tibiae and often coxae whitish. 

 Wings a little clouded, stigma rufescent or testaceous ; tegulae piceous. 

 Length, 13-16 mm. 



The var. 7nela?iogasfer has the post-petiole and usually the scutellum 

 entirely black, its $ often has the central flagellar band, which occupies 

 most of the basal third in the type, entirely wanting. 



This species, which is widely distributed on the Continent, is probably 

 not uncommon in Britain, though the only record I know is that of a 

 female, bred in 1880, by BigncU, from the cocoon of Odonestis potaforia, for 

 which no locality is indicated, though he tells me he has captured this 

 species at Bickleigh. I swept a fine female from Myrica gale, at Matley 

 Bog, in the New Forest, on 13th August ; Piffard has given me both sexes, 

 which he took at Felden, in Herts. ; and Bridgman was of opinion that 

 Tuck had found it at Tostock, in Suffolk, October, 1892. It is said to 

 have been bred from Siinyra albovenosa by Schm. 



ACOLOBUS, Wesmael. 

 Wesm. Nouv. ]\I^m. Ac. Brux. 1S44, p. iii. 



Head thick, hardly buccate, slightly rounded and a little narrowed be- 

 hind the eyes ; clypeus punctate, obsoletely discreted, strongly rounded, 

 with a little tooth in the centre, apically ; labrum nearly hidden \ mandi- 

 bular teeth sub-equal in length ; frons with a vertical tubercle. Antennae 

 slender, setaceous. Thorax stout, longer than high, a little elevated an- 

 teriorly ; pronotum with no transverse depression ; upper metathoracic 

 areae complete ; spiracles linear. Scutellum basally carinate. Abdomen 

 elliptic, apically obtuse ; post-petiole not depressed, sub-glabrous, with 

 carinae feeble ; gastrocaeli obsolete ; terebra short. Legs normal, posterior 

 elongate ; tarsi not pectinate. Wings narrow, sides of areolet strongly 

 converging above. 



A. sericeus, Wesm., the only other species of this genus, closely resembles 

 our species, and is, perhaps, no more than a variety of it. The cephalic 

 and thoracic puncturation is finer, and the abdomen more nitidulous. Its 

 male {cf. Brisch. Schr. Nat. Ges. Danz. 1878) is described in Zeits. Syst. 

 Hym. 1903, p. 188. 



I. albimanus, Grav. 



Ichucttiuon alhinianiis, Gr. I. E. i. 132 ; Ste. 111. M. vii. 133, i . Acolohus albimanus, 

 Wesm. Nouv. Mem. Ac. Brux. 1S44, p. 140 ; Bui. Ac. Brux. 1S54, p. 136 ; Mom. couron. 

 Ac. Belg. 1859, p. 13 ; Berth. Ann. Soc. Fr. 1896, p. 292, 6 9 . 



Head somewhat finely punctate ; mandibles ferrugineous ; palpi white ; 

 c? with cribrary organs, face and external orbits, white ; $ with marks on 

 clypeus, facial, frontal and vertical orbits, stramineous. Antennae black 

 with the scape pale beneath ; of ? white-banded. Tliorax finely punctate, 

 black ; lines beneath, and sometimes before, the radix white ; areola sub- 

 hexagonal or sub-triangular. Scutellum black, rarely apically white in c^ . 



