Chorinaeus | BRITISH ICHNEUMONS. iB) 

CHORINAEUS, Holmgren. 
Holmgr. Sv. Ak. Handl. 1855, p. 320. 
Head transverse and not buccate ; face not at all strongly protuberant ; 
vertex narrow and subtruncate ; interantennal process very short; clypeus 
imperfectly discreted, with its lateral foveae deeply impressed ; oral costa 
not or hardly elevated ; cheeks nitidulous and not sulcate; eyes hardly 
or very broadly emarginate. Antennae somewhat slender, subsetaceous 
with the scape not curved. Thorax stout; pronotum entirely glabrous, 
with epomiae hardly indicated above ; notauli entirely wanting and epic- 
nemia entire; metathorax nitidulous and subglabrous with the spiracles 
small and subcircular, the longitudinal carinae strong but the transverse 
ones, except rarely the costulae, wanting ; basal area confluent with the 
areola, as is also nearly always the very short petiolar. Scutellum neither 
small nor convex, usually completely margined, its basal fovea also bor- 
dered and not broad. Abdomen oblong-fusiformn and somewhat curved 
with the epipleurae inconspicuous; Q with six and g with seven strongly 
and, towards the base, subscabriculously punctate dorsal segments; first 
always bicarinate throughout ; second and sometimes third usually with 
one or three longitudinal carinae; terebra slender, acuminate and con- 
cealed. Legs stout with the ungues and unguiculi not slender; inter- 
mediate calcaria more or less inequal in length. Wings with areolet 
wanting ; first discoidal cell apically acute below ; fenestrae small; lower 
basal nervure oblique, usually subcontinuous with the upper, very rarely 
strongly postfurcal ; nervures of hind wing apically obsolete, nervellus 
strong, oblique and antefurcal. 
This genus differs from the remainder of the Exochides in its 
scabriculously punctate abdomen, with the second and third segments 
usually carinate. Stephens knew three British species in 1835; Haliday 
described a fourth, still unknown on the Continent, in 1839; and Bridg- 
man found anew kind in 1881, subsequently also brought forward by 
Thomson under a distinct name in Sweden. Capron detected another 
Scandinavian kind here in 1888; and I find yet another to be common 
with us. Four other species have been recognised by Thomson in 
Sweden and are by no means unlikely to occur with us. Elsewhere the 
genus appears to be restricted to northern America, where Cresson, Walsh 
and Davis have found a dozen species; and to New Zealand, whence two 
more are known. ‘The indigenous kinds are not very distinct 7z/er se and 
care is necessary for their correct discrimination. 
Table of Species. 
(10). 1. Basal segment strongly bicarinate, 
second also distinctly carinate. 
(9). 2. Intermediate calcaria but slightly 
unequal; second segment uni- 
carinate. 
(8). 3. Smaller; antennae shorter; cheeks 
normal, 
(7). 4. Lower basal nervure subcontinuous ; 
hind tibiae basally white. 
(6). 5. Anterior coxae pale; face entirely 
flavous ou ied a .. 1. CRISTATOR, Grav. 
