56 BRITISH ICHNEUMONS. 
[ Orthocentrus 


At once known by the large and irregularly subsemicircular or triangular 
stigma ; and easily recognised by the arcuate genal sulcus, narrow vertex, 
pulvilli longer than claws, the 9 by its subglabrous second and gradually 
more strongly compressed third to seventh segments, and the d by its 
large stigma which has the basal anterior margin subarcuate. 
Forster’s typeless genus, Phaenosemus (Verh. pr. Rheinl. 1868, p. 160) 
appears to have been founded upon this species. 
It has occurred in Prussia and Finland, and is not infrequent in Sweden, 
extending to the Sarek mountains of Lapland, from July to September ; it 
has there been bred from the pupa of Z7mea cognatella. It was introduced 
as British by Marshall in 1870, but no subsequent records exist. I beat 
a single male from spruce fir (Picea excelsa) at Elvedon in Suffolk, on 4th 
May, 1907; the metathorax is distinctly areated, and both the brevity of 
the basal, radius and strong basal curve of the stigma are very remark- 
able; possibly the late A. J. Chitty, who was with me at the time, also 
took it. I have found a few specimens, sitting beneath the leaves of a 
lime tree in my garden at Monks’ Soham in August and on 25th Sep- 
tember; which dates point to the probability of hibernation. ‘There is a 
female from St. Albans in Marshall’s collection. 
2. corrugatus, Holmgr. 
Orthocentrus corrugatus, Holmgr. Sv. Ak. Handl. 1855, p. 329; Brisch. Schr. 
Nat. Ges. Danz. 1878, p.108, ¢; Thoms. O. E. xxii. 2425, ¢ ?. O. frontalis, 
Brisch. Schr. Ges. Kénigs. 1871, p. 103: Schr. Nat. Ges. Danz. 1878, p.110, ¢. 
Head transverse and narrow behind eyes; vertex slightly emarginate ; 
frons smooth and black, subimpressed on either side with the orbits 
broadly flavidous, and the subvertical orbits concolorous, in both sexes ; 
face normally protuberant, pubescent and, in g, with mouth and cheeks, 
entirely flavous. Antennae filiform and somewhat longer than half the 
body; basal flagellar joint cylindrical and nearly thrice longer than 
broad; of 9 red, of ¢ with the scape flavous and flagellum subinfuscate 
beneath; postannellus of @ linear. ‘Thorax stout, hardly narrower than 
the head, shining and entirely black or in g, with pronotum pale-lined ; 
areola elongate and narrow. Abdomen a little longer than head and 
thorax, black with the second and third incisures ferrugineous ; first seg- 
ment gradually narrowed basally, aciculate-rugulose, and subelevated 
before its centre, with very distinct carinae extending to apex; second 
somewhat longer than broad, aciculate-scabriculous, unequally impressed, 
with an oblique linear sulculus on either side beyond the centre ; third 
finely alutaceous throughout and slightly impressed towards its apex ; 
following smooth and pubescent ; venter flavidous or, in @ like its anus, 
rufescent. Legs normal and red with the anterior, except their apically 
infuscate tarsi, in ¢ paler; hind coxae black with their apices pale, and 
their femora often flavidous above. Wings subhyaline and stigma infus- 
cate; tegulae flavous; radial nervure apically straight and areolet 
triangular or pentagonal. Length, 4—5 mm. 
The broadly pale frontal orbits will instantly distinguish both sexes 
from the remainder of the narrow-headed group of species. 
It is said to be very rare in northern Sweden in August and September, 
and to have occurred in France, whence de Gaulle records it. For long I 
had seen no indigenous examples of this species, which was brought for- 
ward as British, somewhat unsatisfactorily, by the late C. W. Dale (Entom. 
