Acrotomus | BRITISH IGHNEUMONS. 197 

It inclusion in our list is open to criticism, since it was introduced by 
Desvignes, in the genus Tryphon, in 1856 on the strength of a single 9 
Cleniscus pachysoma; though its range from Germany to Sweden renders 
its occurrence not improbable. 
Tryphon cephalotes, Gr. (1. E. 1. 246; Ste. Ill. M. vii. 250; Ratz. Ichn. 
d. Forst. ii. 115), is also referred to the present genus and synonymised 
by Pfankuch (Joc. cit.) with A. /aefus, Grav. It was bred from Nematus 
ribest’ by Rondani. We know nothing of it in Britain, however, beyond 
Stephens’ unreliable record from near London; though Haliday seems 
to have recognised it, since he placed it in his genus Céendscus in 1839. 
5. sexcinctus, Grav. 
Tryphon sexcinctus, Gr. I. E. ii. 164; Ste. Ill. M. vii. 238; Fonsc. Ann. Soc. 
Fr. 1849, p. 219. Exenterus sexcinctus, Schiéd. Guér. Mag. 1839, p. 12, nota ; 
Holmgr. Sv. Ak. Handl. 1855, p. 229, ¢. Ctentscus sexcinctus, Brisch. Schr. 
Phys. Ges. Konig. 1871, p.97; Schr. Nat. Ges. Danz. 1878, p. 104, ¢; cf. Hal. 
Ann. Nat. Hist. 1839, p.113. Acrotomus sexcinctus, Pfank. Zeits. Hym. Dip. 
1906, p. 93. 
Shining, finely punctulate and black, with abdomen not red-marked. 
Head transverse and a little tumidous, hardly constricted posteriorly ; 
mouth, clypeus, cheeks and large lateral facial marks, flavous; clypeus 
distinctly discreted and impressed before the rounded apex ; frons punc- 
tulate and centrally sulcate. Antennae somewhat shorter than body, 
nigrescent ; paler below, with scape entirely black. Thorax immaculate, 
notauli distinct ; metathorax somewhat short with distinct areae, areola 
subsemicircular and petiolar area perpendicular. Scutellum apically de- 
planate, black with its entire apex, and the bifoveolate postscutellum lined 
with, flavous. Abdomen black; basal segment convex, somewhat short, 
gradually dilated apically, subrugulose, laterally margined, discally bi- 
carinate to its centre, with the apical angles rounded; remaining 
segments shining, with their apical margins flavidous. Legs normal, 
red; hind tarsi and tibiae nigrescent, with the latter basally testaceous ; 
tarsal claws distinctly pectinate. ‘Tegulae flavidous; nervellus inter- 
cepted a little below its centre. Length, 5—7 mm. 
I entertain some doubts respecting the distinction of this species from 
the next, since their sculpture appears almost identical ; for the present, 
however, I have been satisfied to separate them by the facial markings, a 
very obvious though doubtfully reliable character. 
A. sexcinctus is, perhaps, rarer than the following species both here and 
on the Continent, whence Gravenhorst records it in June and Van Burgst 
in August; Brischke as bred from larvae of Dineura ( Hemichroa) alnt and 
Gaulle from Cladius difformis. Stephens found it “rare: taken within 
the metropolitan district in July”; it was considered to be common at 
Glanvilles Wootton by Dale and in Norfolk by Bridgman; Bignell found 
it at Bickleigh and Horrabridge at the beginning and end of September, 
in Devon. It is probably local, since I have several from Dr. Capron’s 
collection, from Shere and several taken during May, Juneand July, 1900, 
1901 and 1902 by Charbonnier in his garden at Redland, near Bristol. 
Stenton takes it in profusion in his garden at Herne Hill and has found it 
at Wimbledon. 
