1903] ASHMEAD-. — CYXIPOIDEA 215 



hind tarsi is somewhat thickened and abnormally lengthened, being nearly twice as 

 long as joints 2-5 united. It shows some affinity with the Figitidae, and particu- 

 larly with the subfamily Liopterinae^ and may yet be classified with that family, its 

 members being genuine parasites, but with quite different hosts from those of the 

 Figitides. In Europe, Mr. Andre has bred Ibalia leucospoides Hochenwarth from a 

 Horn-tail, Sirex gigas L., while in America, Mr. W^ Hague Harrington has ascer- 

 tained that Ibalia maculipctinis destroys the larvae of Tremex columba L. and Xiphy- 

 dria albicornis Harris. In the Riley Collection is a single specimen of Ibalia 

 maculipennis labeled, "So. 111. bred from Hickorywood, June 4th, 1875," ^o that 

 probably the group attacks any member of the superfamily Siricoidea, and is there- 

 fore of great economic importance. 



The single genus known may be recognized by the following characters : — 

 Thorax coarsely, transversely rugulose ; front wings with the marginal cell 

 long, narrow lanceolate and usually closed ; antennae in $ 13-jointed, filiform, 

 in $ 1 4-jointed, the third joint excised beyond the middle . Ibalia Latreille 



(Type Ichneumon leucospoides Hochenw.) 

 Addenda. Abbe' J. J. Kieffer has characterized two genera not included in my 

 genera of the Onychiinae, Psyche, vol. 10, p. 11. In order that these genera may 

 not be overlooked I give below a revised table of the genera : — 



Table of Genera. 



Scutellum 7iot spined .......... z 



Scutellum spined .......... 5 



Marginal cell closed., more or less, at the base ; hind tibiae ivithont longitudinal 



ridges • . . . 3 



Marginal cell opeti at the base and along the front margin ; hind tibiae with 

 longitudinal ridges .......... 4 



Mesonotum smooth, polished, with two distinct furrows, without carinae ; 

 scutellum z£////z^?// a median longitudinal carina; marginal cell closed along 

 the front margin ; petiole of abdomen smooth. . Homalaspis Giraud 



Mesonotum scabrous, with three longitudinal carinae ; scutellum wilA a 

 median longitudinal carina ; marginal cell open along the front margin ; peti- 

 ole of abdomen furrowed ..... Lambertonia Kieffer 



(Type L. abnormis Kieffer.) 

 Scutellum ivithout a channel throughout and without transverse ridges 



Tavaresia Kiefifer 

 (Type T. carinata Kieffer.) 



