270 BRITISH ICHNEUMONS. [ Clenopelma 


This genus has a peculiar facies of its own in its stout and almost 
apically incrassate flagellum, peculiarly depressed clypeal apex, strongly 
combed claws and nitidulous body. Forster has, as usual, given a dis- 
tinctive name, Ladroctonus, to such species as possess no areolet; this is 
ignored by Dalla Torre in the case of C. /apponica, etc. Nor do | think 
the same author’s Rhorus, differing solely in its non-discreted clyyeus has 
a right to separate existence. 
Table of Species.* 
(2). 1. Clypeus hardly discreted; central 
segments laterally inflexed .. I. MESOXANTHA, Grav. 
(1). 2. Clypeusstrongly discreted ; segments 
not inflexed. 
(4). 3. Nervellus intercepted below centre ; 
areola incomplete .. - .. 2, XANTHOSTIGMA, ///gr. 
(3). 4. Nervellus intercepted above centre; 
zy 
areola complete .. iy .. 3. NIGRA, Holmgr. 
1. mesoxantha, Grav. 
Tryphon mesoxanthus, Gr. I. E. ii. 233, cf. i, Suppl. 692; Ste. Ill. M. vii. 248, 
é. T. punctus, Gr. I. E. ii. 326, cf. i, Suppl. 692; Stein, Ent. Nachr. 1892, 
p. 102; Kriech. J.c. p. 204, 3%. T. Scoticus, Desv. Cat. 41, ¢. Ctenopelma 
mesoxantha, Holmgr. Sv. Ak. Handl. 1855, p. 117, ¢ ¢; Brisch. Schr. Nat. Ges. 
Danz. 1878, p.71, ?. Rhorus mesoxanthus, Kriech. Ent. Nachr. 1891, p. 247; 
CfagtOe CLIN NSOZ D203.) aie 
Somewhat dull, punctate and black with griseous pubescence. Head 
transverse and a little constricted posteriorly, with frons deplanate; face 
quadrate, in g entirely and in 2 with a large central mark, flavous; 
clypeus hardly discreted, laterally foveate and with palpi and ¢ mandi- 
bles flavous. Antennae as long as body, filiform with the twenty basal 
joints pale beneath. Thorax stout, as long as two basal segments and 
broad.as head, punctate with notauli obsolete ; mesosternum basally de- 
pressed and immarginate; metathoracic areae irregular, with areola 
minute. Abdomen double length of thorax, black, centrally pale; basal 
segment somewhat tumidulous, bicarinate, with spiracles subcentral; the 
third and basally impressed second segments red or flavous, parallel- 
sided and laterally subinflexed ; following black. Legs slender with all 
the coxae, trochanters and, except the anterior partly, femora black ; 
tibiae and tarsi flavidous, with the hind ones apically nigrescent. Wings 
subinfumate, stigma nigrescent, areolet irregularly triangular. Length, 
13—15 mm. 
This large species is recorded from Sweden; Germany, where Ratze- 
burg bred it from Crmbex variabilis (Ichn. d. Forst. iti. 123) ; and France, 

* Ctenopelma rufiventris, Grav. 
Mesoleptus rufiventris, Gr. 1. E. ii. 90,2. Tryphon involutor Gr.l.c. 296; Ratz. Ichn. d. Forst. ii. 
114, 62. Ctenopelma rufiventris, Pfank. Zeits. Hym.-Dip. 1906, p. 31 et 1907, Pp. 147. 
This species must be mentioned here since it was thought by Thomas Desvignes to be British, 
though no one was able to place it till Pfankuch recently examined the types, and Ratzeburg’s record 
of it from Lyda sylvatica is doubtful. It is said to differ from other species of this genus in its testa- 
ceous abdomen, of which only the petiole is basally black; the ¢ has the inner orbits and centre of 
clypeus flavous, and both sexes have concolorous frontal spots; the antennae are subattenuate and 
mainly testaceous; thorax subnitidulous with five metanotal areae, areola apically incomplete; basal 
segment bicarinate, but not discally sulcate; the abdomen is sometimes castaneous (var. involutor) 
or with piceous spots; areolet small, elongately petiolate; nervellus opposite and ¢ valyulea 
exserted. Desvignes’ specimen, under this name, is referable to Cteniscus limbatellus, 
