Homocidus | BRITISH ICHNEUMONS. 99 

petiole transverse, thyridii transversely oval and their intermediate space 
not striolate, and the central segments of the 2 are immaculate. The 
6 differs in having the face, frontal orbits broadly, cheeks, prosternum 
and mesosternum to black spots under the radices, flavescent; coxae and 
trochanters flavescent; third segment with a flavescent basal mark on 
either side, and fourth often with a centrally interrupted basal fascia, 
white. The bimaculate ¢ has frequently been mistaken for 17. bigu/fatus : 
it was so named by Stephens. 
This species has a very restricted Continental range, being recorded 
only from Bavaria by Kriechbaumer, Silesia and Franconia by Graven- 
horst, and the ¢ was for long unrecognised. This sex is much the rarer 
in Britain, whence I have seen but a single example, mixed in Capron’s 
collection with H. digutfatus. The 9 occurs singly on the south of the 
Thames from Kent to Lands End :—Shere, several (Capron), Greenings 
in Surrey, one (Wilson Saunders), Huntingfield in Kent in May, 1904, one 
(Morice), Hastings district in 1908, one (Butterfield), New Forest, one 
(Miss Chawner), Redland near Bristol in July, 1904 and 1907, two (Char- 
bonnier), Maker on 27th August and Crabtree on znd September, Devon 
(Bignell), Lands End (Marquand, in coll. Luff), Govilon and Cornworthy 
one (Marshall). I possess but two specimens from north of the Thames: 
one captured by Mr. Albert Piffard at Felden in Herts and one taken by 
myself on a flower-table of Angelica sylvestris at Foxhall, near Ipswich, on 
5th September, 1902, which is the sole one I have met with in twelve 
years’ collecting. Haliday claims, in MS. in Dublin Museum, to have 
found it commonly in Ireland. That Bridgman’s species is entirely 
synonymous there can I think, with Thomson, be no doubt; its strongest 
claim is the fact that it was taken by Champion at Aviemore, in Scotland. 
Nees took 2. fissor’us near Sickershausen among aphides, AZyzus cerasz, 
Fab., on June 7th; Ratzeburg (/.c.) appears somewhat uncertain concern- 
ing the species bred by Bouché from Syrphus ribesiz, but 1 possess a 
?, carded with the skin of a Syrphus puparium (probably that of S. 
ribesit, which it exactly resembles and which I have frequently taken 
preying upon this aphid), labelled “Emerged July 6th, 1895; bred by 
C. J. Watkins, at Kings Mill, Painswick, Glos.; in pupa about June rth, 
1895, from Syrphus larva found on currant,” probably preying on the 
abundant JZ/yzus ribis, Linn. 
12. ornatus, Grav. 
Bassus deplanatus, Gr. 1. E. iii. 340, excl. ¢. B.ornatus, Gr. lib. cit, 341; 
Brisch. Schr. Nat. Ges. Danz. 1878, p. 113, ¢. B. frenator, Desv. Trans. Ent. 
Soc. 1862, p. 218, ¢. Homoporus ornatus, Thoms. O. E. xiv. 1505; Morl. Trans. 
Ent. Soc. 1905, p.427, ¢ ¢. Var. Bassus deplanatus, Holmgr. Sv. Ak. Handl. 
1855, p. 362, (¢ sic). 
A dull and coarsely punctate black species; legs red with the hind tarsi 
and nearly whole of their tibiae, except the white extreme base, black ; 
scutellum transversely white apically ; mouth and clypeus pale, flagellum 
rufescent beneath ; petiolar carinae parallel. Length, 5—7 mm. 
At once known by the distinct areolet, rugulose basal segments of the 
immaculate abdomen, dull black hind tibiae of which the extreme base 
and inner side basally only are pure white, and by the petiolar carinae 
extending to apex, from all its allies except 7. deplanatus. The head is 
as broad as the thorax, constricted posteriorly; clypeus, mandibles and 
H2 
