Mesoleius | BRITISH ICHNEUMONS. iS 

its margin laterally somewhat deplanate and centre subproduced. An- 
tennae with flagellum ferrugineous, and in 6 scape flavidous, beneath. 
Thorax sometimes in g with mesonotal pale marks before radices ; no- 
tauli apically wanting; mesopleurae alutaceous, more shining and finely 
sculptured in @; longitudinal metathoracic costae distinct, areola com- 
plete. Abdomen with second to fourth segments red, the second in ¢ 
basally black-marked; basal segment rather longer than hind coxae, with 
basal fovea narrowly open apically and emitting two stout or obsolete 
carinae. Anterior legs red, with coxae and base of trochanters black in 
? and stramineous in @; hind legs black with femora except rarely at 
their apices, and centre of tibiae broadly, red. Wings with no areolet, 
stigma infuscate; radix and tegulae stramineous, the latter basally black- 
dotted; nervellus a little antefurcal. Length, 7 mm. 
Allied to JZ. hamulus in the black @ coxae and trochanters, the pale 
ventral plica and distinct cheeks, but especially in the ample wings with 
subelongate radial cell, and the centrally subnasute clypeus. 
This species occurs in damp meadows in the middle of July in central 
and northern Sweden; Gaulle records it from France. Dalla Torre 
credits Brischke with raising this parasite from a species of Wema/us, but 
I find no mention of it from Germany. It is recorded from Norwich by 
Bridgman, who first recognised it as British (Trans. Ent. Soc. 1882, 
p- 156). 
19. tenuiventris, Holmgr. 
Mesoleius tenuiventris, Holmgr. Sv. Ak. Handl. 1856, p. 382, ¢; Thoms. O. E. 
xix. 2042, ¢ ¢. M. erythrogaster, Holmgr. Sv. Ak. Handl. 1876, p. 44, 2. 
An elongate, black species with abdomen mainly clear red and 9 face 
pale. Head very distinctly constricted posteriorly with the mouth, cly- 
peus, face except in @ centrally, and the @ cheeks, flavous; cheeks not 
short ; clypeus apically broadly emarginate and centrally subtuberculate. 
Antennae as long as body and apically subpilose, black with the scape 
flavidous, and flagellum often ferrugineous, beneath. Thorax elongate, 
subelevated and somewhat stout; mesonotum nitidulous and not alu- 
taceous, notauli distinct and elongate; callosities before and beneath 
radices, and in ¢ lateral mesonotal and mesosternal marks, flavous ; 
mesopleurae strongly alutaceous and hardly shining; carinae of petiolar 
area usually complete. Scutellum black, of @ sometimes apically rosy. 
Abdomen fulvous above and flavous beneath, its extreme base and apex 
black-marked or rarely the pygidium and basal half of first segment black ; 
basal segment somewhat narrow, longer than hind coxae, its basal fovea 
emitting two carinulae, postpetiole longer than broad, a little dilated api- 
cally and apically pale; second not transverse. Legs somewhat slender 
and fulvous, with anterior coxae and trochanters flavous ; hind coxae of 
? internally black-marked basally; their trochanters apically flavous ; 
tarsi slender. Wings with nervures pale, stigma dull stramineous, radix 
and tegulae flavidous; areolet wanting; nervellus opposite and _ inter- 
cepted in centre. Length, 7 mm. 
Its elongate form resembles JZ. /ep/ogaster, but the pale Q face is dis- 
tinct. 
We have but small claim to this species at present as British—though 
its record by Thomson (/oc. c’/.) from Germany, Sweden and France 
