Mesoletus | BRITISH ICHNEUMONS. 145 

distinctly short and convex, confluently punctate with griseous pubescence ; 
areola and petiolar.area laterally irregularly elevated. Scutellum black. 
Abdomen discally and ventrally entirely black; basal segment subdilated 
apically, rugosely punctate and distinctly bicarinate; second and third 
rugosely punctate and the following somewhat shining. Legs red with 
only the hind tarsi, and apices of their tibiae broadly, black; the hind 
tibiae usually whitish basally or sometimes only internally towards the 
base; anterior coxae of 9 often black-marked ; front trochanters of @ 
whitish ; hind calcaria hardly extending to centre of metatarsus; hind 
legs elongate. Wings with stigma dark testaceous, radix and tegulae 
stramineous in 3 and dark in 9: areolet petiolate, radial cell narrow and 
lanceolate ; nervellus postfurcal, intercepted distinctly a little above its 
centre. Length, 10—1r5 mm. 
It is allied to Protarchus rufus in the unusual position of the nervellus 
and regularly, strongly punctate mesopleurae but the abdomen is entirely 
black. This is our only species of Thomson’s subgenus O//ophorus, 
characterised by having distinct areolet, the pleurae punctate with specu- 
lum glittering, metathorax areolated and the two basal segments rugosely 
or closely punctate, with the basal discally sulcate and the postpetiole 
margined. The strongly sculptured metathorax and basal segment are 
remarkable; in the indigenous 9 @ the hind tibiae are black, testaceous- 
banded before their base. 
Introduced by Desvignes on account of the specimens misrepresenting 
it in his collection, now in Mus. Brit. It is very rare with us and was not 
truly known to be indigenous till Dr. Capron took a female, now in my 
possession, at Shere about 1880; I also have another example of the same 
sex, kindly sent me by Miss Chawner, who found it recently in the New 
Forest. It occurs in Germany, Belgium, Sweden and France. Hartig is 
said to have raised it from Wematus betularis (Pristiphora betulae) and Dr. 
Giraud queries his breeding it (Ann. Soc. France, 1877, p. 407) from 
Lophyrus polytomus. 
8. semicaligatus, Grav. 
Ichneumon semicaligatus, Gr. Mem. Ac. Sc. Torin, 1820, p. 362, ¢. Tryphon 
semicaligatus, Gr. I. E. ii. 271; Ste. Ill. M. vii. 258, ¢. Mesoleius semicali- 
gatus, Holmgr. Sv. Ak. Hand. 1855, p. 167; l.c. 1876, p. 43; Brisch. Schr. Nat. 
Ges. Danz. 1878, p. 86; M. (Lagarotus) semicaligatus, Thoms. O. E. xvii. 1881, 
¢¢@. War. Tryphon insolens, Gr. I. E. ii. 274, cf. i. 691; Ste. Ill. M. vii. 258, 
9; Mesoletus insolens, Holmgr. Sv. Ak. Handl. 1855, p. 167; /.c. 1876, p. 44; 
M. (Lagarotus) insolens, excl. synon., Thoms. O. E. xvii. 1881, ¢ ¢? 
Head with vertex somewhat broad, hardly constricted posteriorly; cheeks 
subbuccate ; mandibles elongate, somewhat stout and a little curved; 
clypeus not discreted, subtruncately depressed and hardly emarginate 
apically, with lateral foveae small; frons deplanate, dull and closely punc- 
tate; mouth and clypeus of ? piceous and of @, together (in form typ.) 
with the whole face, flavous. Antennae a little longer than body, api- 
cally subattenuate, with the first flagellar joint half as long again as 
second; scape of @ flavous-marked beneath. ‘Thorax narrower than 
head, immaculate and not coarctate ; notauli extremely superficial ; meta- 
notum rugulose throughout with central costae parallel; petiolar area 
short, semicircular, often basally incomplete and not reaching centre ; 
mesosternum with speculum glittering and mesopleurae strongly rugose- 
coriaceous, Scutellum black. Abdomen subelongate, rarely nearly 
K 
