152 BRITISH ICHNEUMONS. | Wesoleius 


17. hamulus, Grav. 
Tryphon hamulus, Gr. 1. E. ii. 322; Ste. Ill. M. vii. 263, ¢ . Mesoleius hamu- 
lus, Holmgr. Sv. Ak. Handl. 1855, p.172, ?; lib. cit. 1876, p.24; Thoms. O. E. 
xix. 2038, ¢ ¢. M. nobilis, Holmgr. Sv. Ak. Handl. 1855. p. 178, ¢; Brisch. 
Schr. Nat. Ges. Danz. 1871, p.84; Jib. cit. 1878, p.89, 3 2. 
A distinct-looking species, deplanate and very dull with the abdomen, 
except basally, clear red or castaneous and the hind tibiae, with their 
subincrassate tarsi, black. Head with the mouth and clypeus dull 
stramineous or whitish; centre of mandibles concolorous. Antennae 
black, a little longer than the body and apically slightly attenuate. Thorax 
discally deplanate, with a dot and a usually hamate line before radices 
stramineous; petiolar area laterally but not basally carinate, its sides 
forming an apically incomplete areola. Scutellum black and dull. Abdo- 
men as long and broad as head and thorax, oblong and subsessile, red or 
castaneous, with the first segment alone or also base of the second more 
or less broadly black; first segment distinctly bicarinate basally, a little 
explanate apically, longer than broad with distinct spiracles before its 
centre; terebra black and slightly exserted. Legs not slender, the 
anterior red with trochanters and coxae black ; the hind ones black with 
the femora, except sometimes at both base and apex red, and their tibiae 
rarely badious below towards their base. Wings hyaline with stigma and 
radius nigrescent; radix and tegulae whitish; areolet wanting and the 
basal nervure subcontinuous through the median. Length, 7—8 mm. 
The 6 differs in having the face with cheeks and mouth, the scape 
beneath, profuse thoracic markings and the legs flavous or stramineous, 
with only the hind coxae basally black. 
It is distinct in the peculiar abdominal colour, mainly black 9 legs and 
pale hamate 2 mesonotum, while the @ has the thorax, including whole 
or sides of scutellum, almost mainly pale. 
A wide-spread species through Austria, Germany, Sweden and France. 
The single Q in Stephens’ collection, which I have seen, was found at 
Darenth Wood in June. There are two other females in Desvignes’ col- 
lection, together with one that I do not consider more than a variety, 
differing in its immaculate thorax, black tegulae and slightly but distinctly 
postfurcal basal nervure. I possess two females of the same form, which 
I found on 27th and 31st May, on blackthorn leaves and by sweeping ona 
hot, sandy bank at 4.30 p.m. in the Bentley Woods near Ipswich, in 1900 
and 1902; so distinct is this species from the usual appearance of AZesolezus 
that I at first mistook them for the 9 Q of Luceros, from which the 
simple claws separate it. Records are from Lynn in Norfolk (Atmore), 
Norwich (Bridgman), Maker in Devon on 5th June (Bignell) and St. 
Albans (Marshall, Ent. Ann. 1874, p. 143). 
18. ignavus, Holmgr. 
Mesoleius ignavus, Holmgr. Sv. Ak. Handl. 1855, p. 174, cf. p. 381; lib. cit. 
1876, p. 32; Thoms. O. E. xix. 2039, 9 ¢. 
A narrow, somewhat slender species. Head obviously constricted 
posteriorly; mouth, clypeus, face except sometimes partly in 9, and 
apices of ¢ cheeks, flavous; clypeus subtruncate or slightly emarginate. 
