INTRODUCTORY PAPERS ON ICHNEUMONID2. 37 
British Museum catalogue, Marshall gives this species as doubt- 
fully British. The National Collection contains one specimen 
from Desvignes’ collection; and we have seen a fine male taken 
at Ventnor in July, 1867, by Mr. Pascoe. Dr. Giraud bred 
L. macrobatus from Osmia adunca*, and Perris from a species of 
Eumenes ; while Ratzeburg’s Acroricnus Schaum, which is cer- 
tainly Gravenhorst's species, as pointed out by Kriechbaumer, was 
bred at the end of May, 1851, by Graff, from the nests of Humenes 
coarctata. ‘The male, with an enlarged cut of the metathorax, is 
well figured by Ratzeburg (‘Die Ichneumonen,’ iii. 92); and a 
good coloured figure of the female, the abdomen of the male, Xc., 
is given by Vollenhoven (‘ Pinacographia,’ pl. 6, figs. 1, la, 1b). 
Cyrtrocryrprus, Marshall. 
Black ; areolet minute; legs red. Male—tface, front cox and trochanters 
white; hind coxe brown. Female—antenne white-ringed; aculeus 
one-third of abdomen. — - : = 1. brachycentrus, 3—4 lines. 
The abdomen of this species is almost sessile, giving the 
insect a very Pimplid appearance, hence Taschenberg’s specific 
name (pimplarius); the areola is very small, and the aculeus very 
short. The female is well figured by Vollenhoven in ‘ Pinaco- 
graphia’ (pl. 41, fig. 5). This species is not uncommon in 
Britain; according to Dours’ Catalogue it has been bred from 
Saperda populnea by Col. Goureau. 
MESOSTENUS, Grav. 
A. Abdomen red ; petiole and apex black.’ (Male and female.) 
a. Ist segment of abdomen not punctate. 
Lines before and lateral margins of scutellum white. 
1. albinotatus, 24—5 lines. 
b. Ist segment with deep coarse punctures. 
** Hind femora and basal half of front and middle ones black; also the 
post petiole, except the red apical margin. 2. obnowius, 24—4 lines. 
* Hind and front femora red; post petiole red. 3. ligator, 53— 6+ lines. 
B. Black; scutellum yellow; antenne pale-ringed. - maurus, 5 lines. 
The small quadrate areolet is a readily distinguished mark of 
this genus. ‘The sexes of the common M. ligator are beautifully 
figured by Vollenhoven (‘ Pinacographia,’ pl. 41, figs. 1, 2); figure 
4 of the same plate is not M. obnoxius. M. gladiator, Scop., 
which should occur in Britain, is probably the species referred to 
by Réaumur, and figured on plate xxix., figs. 1—10, of his 
