42 BRITISH ICHNEUMONS. [ Bxochus 




stout and pale red with the coxae and trochanters black, the latter usually 
apically red, and the hind tibiae basally a little paler; intermediate cal- 
caria nearly equal in length; hind tarsi testaceous; @ with the anterior 
coxae often testaceous beneath. Wings slightly clouded with the stigma 
and radius infuscate, radix and tegulae piceous with the latter externally 
stramineous ; radial nervure apically straight and the basal exactly con- 
tinuous through the median, with the lower basal less oblique than usual. 
Length, 6-—8 mm. 
At once known from all other species of Z'vochus by its black abdomen 
and exactly continuous basal nervure; £. grav7s differs only in the colour 
of the legs and abdomen; £. értfannicus mainly in the much longer 
carinae of the basal segment. 
VAR. INCIDENS, Thoms. [Exochus tardigradus, Holmgr. Sv. Ak. Handl. 
1855, p. 315, 8 (mec. Grav.); E. incidens, Thoms, Deut. Ent. Zeit. 1887, p. 208; 
cf. Opusc. Ent. xix, 2131, 3 ?.] 
Thomson describes this as a species, not yet known in Britain, distinct 
from £’. gravipes, entirely on the strength of the pedal colouration, which 
is more flavescent, and of the g face, which he says is entirely pale. It 
cannot be more than a variety of the present species, however, since on 
June 7th, 1902, I took on hawthorn blossom near Wicken Fen in Cambs., 
three males of which two have the face entirely and one only basally 
flavous; they were taken in company and are certainly co-specific. This, 
and not the true £. fardigradus of Grav., is the species introduced as 
British by Marshall in 1870. 
E.. gravipes occurs throughout Europe. It is found upon umbelliferous 
flowers in July, August and October in Germany, where Ratzeburg bred 
it from Hy ponomeuta padella in July, and Brischke from larvae of Tinea 
consociella ; it is not infrequent in damp meadows in Sweden in August; 
and Dalla Torre says that Vollenhoven bred it from the destructive beetle, 
Dermestes vulpinus, though upon what authority 1 know not. Hope tooka 
male about Netley with the mandibles except apically stramineous, a 
whitish transverse facial line below antennae, the tegulae and a callosity 
before radices also white (Grav.) ; taken in June and July, near London 
(Stephens) ; specimens in Marshall’s collection are from Cornworthy and 
Bishops Teignton in Devon, Botusfleming in Cornwall and St. Albans; 
but Bridgman does not appear to have known the species, which is cer- 
tainly rare with us, since besides the males mentioned above I possess 
but three females in Capron’s Surrey collection and a single fine male, 
swept by Elliott on zoth August, 1907, from herbage by the ay at 
Birnam in Perth, opposite Dunkeld. Heyshamhad a specimen, probably 
from the Carlisle district. 
15. gravis, Grav. 
Exochus gravis, Gr. 1. E.ii. 354, ¢; Thoms. Deut. Ent. Zeit. 1887, p. 208; O. 
Bs xix. 2USl is 2: 
A black species with the abdomen centrally bright brick red ; tibiae 
and tarsi entirely red with the hind femora, except basally, and the apices 
only of the anterior concolorous; tibiae not basally paler; basal area con- 
fluent with areola ; carinae of basal segment extending only to its centre ; 
wings slightly infumate with the tegulae and radix infuscate ; nervellus 
distinct. Length, 5,—64 mm. 
