14 BRITISH ICHNEUMONS. [ Homocidus 

centre, and the legs, red; anterior coxae and trochanters citrinous, hind 
coxae black; areolet wanting or rarely small and sessile. Length, 
4—5i+ mm. 
I very much doubt the specific value of this name, since the areolet 
may or may not be present in both this and the last species, and the hind 
coxae seem to vary from entirely red, through entirely subinfuscate and 
partly to wholely black, and that the other distinctions are more constant 
is, 1 think, open to doubt. Thomson says (Joc. cz.) that this species is 
verv like the last but that it has black hind coxae, more finely rugose 
metathorax and hardly indicated areae, the abdomen is mainly black with 
the central rufescence narrower, the wings almost always have the areolet 
wanting and the @ usually has a pale mesosternal mark before the inter- 
mediate coxae. 
Its range may be supposed co-extensive with that of the last species, 
extending to Nantes (Marshall, 27 coll C.A/.). I possess specimens with 
black coxae and no areolet from Giffnock in Scotland (Dalglish); Cadney 
(Peacock) and Leamlands (Morley), in Lincs.; Bury St. Edmunds (Tuck); 
Greenings (W. Saunders) and Shere (Capron), in Surrey; and it has 
occurred to me in Suffolk at Claydon, Brandon, Pakenham Fen, Depden 
and Monks’ Soham, on the flowers of Angelica sylvestris, reeds and low 
herbage, from May to October, though much more sparingly than /. szg- 
natus. ‘This is probably the species bred by Brischke in Prussia from 
some species of Sy7phus. 
ZOOTREPHUS, Thomson. 
Thoms. O. E. xiv. 1486; (?) Zootrephes, Forst. Verh. pr. Rheinl. 1868, p. 162. 
Face dull, densely punctate throughout and not distinctly impressed 
longitudinally. Antennae filiform with the flagellum more or less entirely 
red; scape excised to its centre. Mesonotum strongly nitidulous, im- 
maculate and subglabrous; notauli deeply impressed; metathorax not 
unusually short, with its central areae roughly delineated; spiracles small 
and immaculate. Scutellum black with the basal fovea simple. Abdo- 
men mainly bright red, towards the base dull and finely coriaceous. 
Legs entirely red, with their base usually black and flavous marked. 
Areolet wanting; inner cubital nervure regularly curved throughout and 
not-abruptly angled centrally; posterior nervure of fore wing distinctly 
curved between the basal and first recurrent nervures; nervellus post- 
furcal and intercepted distinctly below the centre. 
This genus is not very distinct superficially, strongly resembling the 
broadly red-marked Promethi and the Antarophron-group of Homocidus; but 
it may be known by its densely and finely coriaceous face which is not 
nitidulous as in the former, and the very distinct notauli which are wanting 
in the latter. Sometimes the anus is entirely red, which is the case with 
no other member of the Basszdes. 
In my former paper (Trans. Ent. Soc. 1905, p.425) I admitted two 
species of this genus as British, but after a careful examination of a long 
series of specimens I am now convinced that we have but one. Aassus 
rufiventris, Grav., is placed in this genus by Thomson and but very im- 
perfectly distinguished from Holmgreni, Bridg.; Dalla Torre, following 
Marshall, has placed it in Polyblastus, as the 2 of Forster's Z7y phon 
erythrozonius. Gravenhorst’s short description, however, agrees perfectly 
