100 BRITISH ICHNEUMONS. [ Homocidus 


mouth pale or in @ with the whole face also flavous ; antennae quite fili- 
form, with flagellum distinctly rufescent beneath ; metathorax subrugose, 
with basal and petiolar areae more or less distinctly indicated ; wings with 
areolet entire, small and subpetiolate; abdomen deplanate and apically 
obtuse ; basal segment strongly and parallelly bicarinate to apex of the 
quadrate postpetiole, second transverse and coarsely striolate with dis- 
tinct thyridii; legs stout and red. The ¢ also has mesonotal humeral 
markings, a mesosternal lunula, the anterior coxae and ventral plica, pale. 
This species occurs throughout northern and central Europe, and I 
have seen it from the Punjab, in India; Boie was probably in error in 
giving (Wiegm. Archiv. 1836, p. 39) (Vocfua chenopodi as its host, which 
is far more probably one of the species of Scaezva (Syrphus), from which it 
is said to have been raised by Thomson. Sichel was also certainly wrong 
in synonymising it with Bassus rufipes, Grav. (Ann. Soc. France, 1856, 
Bull. p. 78). In Britain it appears not very uncommon in the late summer 
—Gravenhorst took it as late as October at bramble—though much rarer 
in the spring. Bawsey Heath in Norfolk, taken by Atmore (Bridgman) ; 
Painswick in Gloster (Watkins); Plumstead and Blackheath in Sept., 
1901 (Beaumont) ; New Forest in September, 1901 (Adams) ; Lastingham 
in Yorks (Marshall); Chatham in May, 1892 (Garde); Eriswell in 
Suffolk, 27th September, 1907 (Elliott). Though most of these localities 
are well inland, I have personally only found it on the coast, but lacking 
a knowledge of its hosts the reason is obscure ; at Lowestoft at the end 
of August, 1898, I grubbed it from the root of marram grass on the sand 
hills; at Southwold one was attracted to artificial light on rst August, 
1900; I found it in a garden at Ryde, in Isle of Wight, in the middle of 
August, 1902; and it occurred in great numbers on reeds in the salt- 
marshes at Southwold from 7th to 14th September, 1907. 
13. deplanatus, Grav. 
Bassus deplanatus, Gr. I. E. iii. 340, excl. ?; Holmgr. Sv. Ak. Handl. 1854, 
p87, 2 3 120. ett. 1855; p.362,iexcl. “oc”; Brisch.Schr, Nat.(Ges. Danz: 1873; 
p-112, ¢ ?. Var. Bridg. Trans. Ent. Soc. 1887, p. 375, ¢. Homoporus deplan- 
atus, Morl. lib. cit. 1905, p.427; ¢ %. H. nigricornis, Thoms. O. E. xiv. 
1506, ¢. 
A dull and coarsely punctate black species; legs red with front coxae, 
hind tarsi and whole of their tibiae, except the white extreme base, black ; 
scutellum transversely white apically ; centre of mandibles and an epis- 
tomal line pale; petiolar carinae divergent. Length, 6—7 mm. 
This species is so similar to the last that Iam not satisfied respecting 
its specific value; both sexes differ, however, in having the carinae of the 
first segment basally subdentate, centrally gradually and apically strongly 
convergent, becoming subconfluent discally; the @ differs from that of 
H. ornatus in its immaculate face, antennae rufescent throughout, im- 
maculate sternum, black-marked front coxae and the simply white- 
banded hind tibiae, the pale marking of which does not extend internally 
down the leg. 
Bridgman’s variety has the antennae entirely black (var. migricornis, 
Thoms.), all the coxae red and the nervellus intercepted nearer its centre ; 
its size is larger, 8 mm. It was captured at Aviemore by Champion. 
The only British specimens I can ascribe to this species are three 
females taken by Dr. Capron at Shere in Surrey, some twenty years ago ; 
