260 BRITISH ICHNEUMONS. [Acaeniliis. 



attenuate towards the base ; infuscatc and broadly fulvous beneath, with 

 the scape and basal flagellar joint, which is cur\^ed and nearly half as long 

 again as the second, enlireh- black. Thorax gibbulous and immaculate ; 

 mesonotum trilobed tu its base, strongly nitidulous laterally, centrally 

 striate and anteriorly canaliculate in the centre ; mesonotum and pleurae 

 co/iaceous ; metathorax with all the areae entire, though very roughly 

 defined ; basal area broader than long and apically subexplanate ; areola 

 hexagonal, not longer than broad, emitting costulae from near its base ; 

 petiolar area glabrous, laterally impressed and centrally carinate longitud- 

 inally, its basal costa strongly curved. Abdomen slightly longer than 

 head and thorax, subfusiform, laterally compressed, broadest centrally, 

 entirely glabrous and nitidulous with only the first segment basally acic- 

 ulate and bicarinate ; third to sixth ventral 9 segments spinately pro- 

 duced ; terebra rather longer than half the abdomen. Legs stout and 

 bright fulvous with the coxae, trochanters and extreme base of all the 

 femora jet black ; hind legs strongly incrassate, with tibiae and tarsi 

 black. Wings large and distinctly clouded ; stigma ferrugineous and 

 peculiarly narrow ; radix and tegulae black, the former often ferrugineous. 

 Length, 9 — 13 mm. 



It is said by Tosquinet to occur on the Continent from June to Sep- 

 tember ; Gravenhorst took a male on UmhcUiferae about Cudova, in 

 Silesia, in August ; Holmgren found it in flowers of Pastinacea and 

 Brischke has bred it in Prussia from Sesia formicaefonnis. There is a 

 female in Marshall's collection in the British Museum from the Pyrenees, 

 and a male from Desvignes'. I took a single male on a flower-table of 

 Angelica sylvtstris in Tuddenham Fen, Suffolk, in a very marshy spot, on 

 29th August, 1902 ; and have seen three others of the same sex captured 

 by Chitty in Wicken Fen, Cambs., on i8th August, 1900. With us it 

 would appear to be both rare and local. 



2. dubitator, Panz. 



Ichneumon dubitator, Panz. F. G. Ixxviii. 14 ; Latr. H. N. xiii. 180. C)yptiis 

 dubitator. Fab. Piez. 85. Acaenites dubitator, Gr. I. E. iii. 810, ? ; Latr. Cuv. 

 R. A., ed Masson, pi. cxii, f. 2 ; Tasch. Zeits. Ges. Nat. 1863, p. 298, <? ¥ . 



Black with the pleurae very closely and confluently punctate. Abdo- 

 men of (5 rarely entirely black with only the apical segments narrowly 

 whitish, but usually in both sexes with the second and third segments 

 entirely fulvous, sometimes black-marked, apex of first generally and 

 sometimes the fourth basally and laterally fulvous ; the remainder mar- 

 gined with white or dull testaceous ; basal segment a little longer than 

 broad ; the sixth and seventh spiniformly concave ; terebra black and as 

 long as the body with the spicula red. Legs fulvous with all the cDxae and 

 trochanters, together with the hind tarsi, black ; hind tibiae generally ex- 



