58 BRITISH ICHNEUMONS. [ Orthocentrus 

4. frontator, Zett. 
Tryphon frontator, Zett. I. L. i.398, ¢. Orthocentrus frontator, Holmgr. 
Sv. Ak. Handl. 1855, p. 326; Thoms. O. E. xxii. 2425, ¢ ¢. 
Head with the vertex narrow, and the frons glabrous and nitidulous 
throughout; ¢@ with frontal orbits entirely, the punctate face and the 
cheeks, flavous; ? with face finely and transversely aciculate-punctate 
and the frons broadly stramineous to but slightly above the scrobes. 
Antennae of 9 with basal flagellar joint triangular and a little longer than 
the quadrate second, postannellus neither short nor linear. Thorax of @ 
with pronotum, prosternum, a callosity and a line before radices, flavous. 
Legs fulvous, with anterior of g stramineous. Wings with the areolet 
obliquely pentagonal, subcoalescent though hardly sessile above, and but 
very slightly broader than high; nervellus geniculate, though not inter- 
cepted. Length, 4—5 mm. 
The hind coxae are sometimes black with the femora above, tarsi and 
apices of their tibiae, occasionally infuscate ; the ? rarely has the areolet 
externally incomplete. 
This species is at once known from O. s¢igmaticus by the normal stigma 
and sculptured second segment, from O. corrugatus by the immaculate 
vertex, and from O. monzlicornis by the pale frontal markings, which are 
confined to the orbits and do not extend across the disc as in O. sannio. 
O. frontator has not before been recorded from Britain, and my know- 
ledge of it is derived from several examples of both sexes, captured some 
twenty years ago in the neighbourhood of Shere in Surrey by the late Dr. 
Edward Capron, in whose collection they were (like every other species of 
Orthocentrus, except Bridgman’s MS. O. undfascratus) unnamed. It is a 
northern species, first found in Lapland and recently captured by Roman 
in the Sarek Mountains of Sweden (Nat. Unt. Sarek, iv. 352), though 
extending as far south as France. As, doubtless, in most collections, the 
males of this species were mixed in Marshall’s with those of O. monilt- 
cornis and O. marginatus ; they are from Cornworthy in Devon. Lyle has 
beaten a female in the New Forest from U/ex on 26th October, which 
points to hibernation. 
5. sannio, Holmgr. 
Orthocentrus Sannio, Holmgr. Sv. Ak. Handl. 1855, p.331; Thoms. O. E. 
xxii. 2426, ¢ ?; cf. Brisch. Schr. Ges. Konig. 1871, p.102 et Schr. Nat. Ges. 
Danz. 1878, p.109, ¢. O. wnifasciatus, Bridg. MS., ¢. 
Black. Head of ¢ with face, cheeks very broadly and frons entirely, 
flavous. Antennae of 9 with the two basal flagellar joints subtransverse. 
Thorax of ¢ with the prothorax and mesosternum entirely flavous. 
Abdomen with apex of the second and basal half of the third segments in 
6 red. Legs fulvous with the anterior of @ flavous and its hind coxae 
subinfuscate basally above. Wings with the areolet pentagonal, sub- 
petiolate and but very slightly broader than high ; nervellus geniculate at 
its lower fourth, but hardly intercepted. Length, 33—5 mm. 
This species is similar to O. marginatus and O. frontator in its capital 
conformation and glabrous frons, but the female has the basal flagellar 
joints shorter and the ¢ is abundantly distinct in the unique colouration 
of its frons and mesosternum. 
