148 BRITISH ICHNEUMONS. [Mesoleius 

third are entirely concolorous, the hind femora black with their extreme 
apices castaneous, the areola and petiolar area are distinct, the former 
narrow and apically acuminate, the latter broad with a central carina. 
August on umbelliferous flowers in Germany ; Lapland, Sweden, France 
and Belgium. Gravenhorst records it from Netley in Shropshire, and 
there is a male named by him in Mus. Brit., which is smaller and more 
slender than either Desvignes’ or Stephens’ specimens; in fact I am in- 
clined to regard the latter, found in the London district in “June,” with 
considerable suspicion. Marshall had specimens from Govilon in Mon- 
mouth and Bugbrooke in Northants; and I possess others taken by 
Beaumont at Harting in Sussex during early September, by Charbonnier 
at Lynmouth during the same month and by Elliott at Torphins on 3rd 
September. It has only occurred to me at Gritnam Wood in the New 
Forest on 27th August, 1901, and at Worlington in Suffolk on 28th 
August, 1906, on an angelica flower by the River Lark. 
11. rufolabris, Zett. 
Bassus (Tryphon) rufolabris, Zett. Ins. Lap i. 380,?. Mesoletus rufolabris, 
Holmer. Sv. Ak. Handl. 1855, p.171, cf. p. 381; l.c. 1876, p.46; Brisch. Schr. 
Nat. Ges. Danz. 1878, p. 88; M. (Scopesus) rufolabris, Thoms. O.E. xix. 
2029, $ 9°. 
Head constricted posteriorly, with cheeks shorter than breadth of base 
of mandibles; clypeus and mouth of ? piceous or ferrugineous, of ¢ 
with clypeus and face flavidous. Antennae infuscate with flagellum terru- 
gineous, and @ scape whitish, beneath. Thorax stout and immaculate 
or rarely in @ with pale callosity at radices; notauli short and not reach- 
ing apex; mesopleurae finely and alutaceously punctate, with striae before 
the not glabrous though shining speculum ; petiolar area not extending 
beyond apical third of metathorax and generally complete. Scutellum 
black. Abdomen with three or four basal segments, except first of 0, 
red; first segment explanate throughout, not laterally margined basally, 
with no discal carinae nor sulcus. Legs red with coxae and trochanters 
entirely in Q and basally in Q, the hind tarsi with apices of their femora 
narrowly and of their tibiae broadly, nigrescent; claws and claw-joints 
stout. Wings with stigma dull stramineous, tegulae of ¢ whitish and of 
Q piceous or pale ; areolet wanting, basal nervure subcontinuous ; nervel- 
lus opposite and intercepted at its centre. Length, 7—10 mm. 
Both sexes occasionally have the hind femora badious or nigrescent 
and the Q sometimes has the fourth segment apically black. 
This species has been bred by Brischke from a Zenfhredo larva in 
Prussia and occurs in France, Sweden and Lapland. Mr. E. A. Butler 
introduced it as British (E.M.M. 1881, p. 236) by the capture of two 
females at Wymondley in Herts, during August, 1880, and Bridgman says 
(Trans. Ent. Soc. 1881, p. 163) that they have a pale line beneath the 
radices; subsequently he adds (Trans. Norf. Soc. 1894, p. 626) that the 
species is common in Norfolk; Bignell took AZ. “ru/folep/us”’ at Bickleigh 
in Devon on 3rd August, and Marshall found females at Cornworthy in 
Devon and Botusfleming in Cornwall. I possess a couple of both sexes 
from Surrey in Capron’s collection and have myself swept females on 29th 
August, 1902, in Tuddenham Fen, Suffolk, and on 24th August, 1906, 
