150 BRITISH ICHNEUMONS. | Mesolerus 

fovea apically nearly closed, discal sulcus often indicated to beyond spira- 
cles, apical angles obtuse or subrotundate. Legs normal; anterior red 
with coxae and trochanters black in ? and stramineous in g; hind ones 
black with femora except at both extremities red, and tibiae except 
apically pale; hind @ trochanters flavous, discally black-lined. Wings 
with no areolet; stigma dull stramineous and darker in 6, radix stra- 
mineous, tegulae of g concolourous and of @ subinfuscate; nervellus 
antefurcal. Length, 7—8 mm. 
This species varies in having the basal segment apically, the second 
and third entirely and fourth basally castaneous-red or the abdomen black 
with only the second and third segments discally or apically castaneous ; 
the clypeus apically black or entirely pale; the hind femora red or with 
their base and apex black. Thomson suggests its synonymy with JZ, swd- 
fasciatus, Holmgr. 1855, p. 142, which is not recorded as British. 
I do not know this insect, which is said to extend nearly throughout 
Europe. It was recorded from Earlham in Norfolk by Bridgman (Trans. 
Norf. Soc. 1894, p. 626), with no indication of its novelty as British. 
14. nigricollis, Grav. 
Tryphon nigricollis, Gr. 1. E. ii. 234; Ste. Ill. M. vii. 248, ¢. T. longipes, 
Gr. I. E. ii. 319, ¢. Bassus nigricollis, Zett. Ins. Lap. i. 380, ¢ ¢. Mesoletus 
nigricollis, Holmgr. Sv. Ak. Handl. 1855, p. 176; l.c. 1876, p.36; Brisch. Schr. 
Nat. Ges. Danz. 1878, p.89; M. (Scopesus) nigricollis, Thoms. O. E. xix. 
2032, ¢ ¢. 
A black species with the mouth, lateral facial marks, the four basal seg- 
ments and legs flavous; coxae and trochanters, hind femora and apices 
of their tibiae black; @ with whole face, scape beneath, all the trochan- 
ters and the anterior coxae pale flavous. Length, 9—11 mm. 
Similar to Jesoletus bicolor in structure, but with the apical joint 
of the maxillary palpi longer than the penultimate, the hind tarsi flavous, 
the apical lateral angles of the clypeus indicated, with the distinct colour- 
ation of the abdomen and hind tarsi. The ¢ var. longipes has the basal 
segment black, and lateral mesonotal flavous spots. By no means unlike 
Tryphon elongator, though without frontal horn. 
“Scarce: found in the north of England and Scotland, in July,” says 
Stephens whose single male, with a female ex coll. Desvignes, in the 
British Museum are the only examples I have seen of this distinct species, 
which extends from Lapland, central and southern Sweden to Prussia, 
Gottingen and France. 
15. dorsalis, Grav. 
Tryphon dorsalis, Gr. 1.E. ii. 226,¢. Mesoleius dorsalis, Holmgr. Sv. Ak. 
Handl. 1855, p. 169; Jib. cit. 1876, p.32; Brisch. Schr. Nat. Ges. Danz. 1878, 
p. 88; Jib. cit. 1891, p. 62; Thoms. O.E. xix. 2036; Pfank. Zeits. Hym.-Dip. 
1906, p.192,3 2. 
Head short and a little constricted posteriorly; mouth, clypeus and in 
3 face but not cheeks, flavidous; clypeus simply rounded apically; eyes 
large. Antennae somewhat longer than body with scape of ¢ flavidous, 
and flagellum ferrugineous, beneath. Thorax alutaceously punctate and 
dull, with distinct notauli; dots before radices flavidous; mesopleurae 
