Zootrephus | BRITISH ICHNEUMONS. 115 

with our insect, as far as one is able to judge, with the sole exception of 
the colour of the anterior coxae; and this is confirmed by Pfankuch, who 
examined the type in 1910. 
1. rufiventris, Grav. 
Bassus rufiventris, Gr. I. E. iii. 312,?; B. sulcator, var. 2, Gr. lib. cit. 322, 
é. Tryphon erythrozontus, Forst. Verh. pr. Rheinl. 1850, p. 283 (2). Bassus 
Holmgrent, Bridg. Traus. Ent. Soc. 1882, p.161, ¢ 2. Zootrephus Holmgreni, 
Thoms. O. E. xiv. 1487; Morl. Trans. Ent. Soc. 1905, pp. 425 et 431, ¢ 2. 
Mouth of 2 alone flavous or also the juxta-antennal orbits concolor- 
ous; ¢ with the head anteriorly entirely unicolorous red or with the 
mouth and face, except sometimes the clypeal foveae and more or less of 
the margins of the epistoma, flavous. Antennae slightly shorter than the 
body ; red at least beneath throughout, or with the scape entirely black 
and in 6 broadly flavous beneath. Thorax gibbous and immaculate 
Abdomen a little longer and narrower than head and thorax, deplanate 
and sublanceolate, or in g nearly parallel-sided ; basal segment black, 
slightly longer than broad, hardly constricted basally and centrally sub- 
bicarinate; remainder rarely entirely red, usually more or less narrowly 
black towards the anus, and in ¢ with the second segment basally black. 
Legs red with the hind coxae usually broadly black basally, the anterior 
similarly coloured, entirely red or more usually totally flavous. Length, 
4—54 mm. 
Bassus rufiventris, Grav., has now been found to belong to Zoofrephus, 
and no doubt can be entertained that Bridgman’s species is entirely 
synonymous with it; he described it as new, doubtless, because Marshall 
had placed the former in his 1872 Catalogue in a different genus. 
This species is recorded from Esher, Brundall and Felthorpe by Bridg- 
man, Bishops Teignton by Marshall, Guestling by Bloomfield, Bickleigh 
and Princetown in Devon by Bignell ; I possess examples captured at Rei- 
gate by Wilson Saunders; Shere by Capron; Harting by Beaumont; Bun- 
gay by Tuck ; as commonin Ireland by Haliday (MS. in Dublin Museum) ; 
Point of Aire by Tomlin ; and several from St. Kilda (cf Ann. Scot. Nat. 
Hist. 1906, p. 151) by Waterston in June, 1905. It isin my experience local 
but common where it occurs; thus I have never taken it about Ipswich 
during fifteen years’ collecting, though in the marshes of the Little Ouse 
in N.W. Suffolk it is found annually in some numbers about Brandon, 
from 5th June to 25th September, as well as on the banks of the Lark at 
Mildenhall, Barton Mills and Tuddenham Fen, in the same district; the 
sexes are found in equal frequency upon long grass and reeds in only the 
wettest and most boggy spots, invariably by sweeping, though my single 
6 from Holbon Marsh, near Beccles, may have been taken from 
Angelica sylvestris flower ; elsewhere I have seen it only in Wicken Fen, 
Cambs., and by the Nen at Peterborough in June, 1908. Nothing is yet 
known of its economy, which is probably related to some paludose Dip- 
teron. 
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