Perithous.'] BRITISH ICHNEUMONS. 45 



slightly longer than the abdomen. Legs nonnal, with the hind coxae 

 subovate and femora stout ; apical tarsal joint twice or more longer than 

 the penultimate, with the claws neither pectinate nor basally lobately 

 dilated. Wings as in Ephialtes, than which the whole body is more 

 nitidulous. 



Table fl/ Species. 



(2). I. Thorax not red marked .1. ALBICINCTUS, Grav. 



(i). 2. Thorax mainly red 



(6). 3. Terebra as long as body; ^ clypeus 



not strongly depressed 

 (5). 4. Clypeus apically emarginate ; cubital 



ner\-ure angled 2. MEDIATOR, I^ab. 



(4). 5. Ch^peus apically truncate ; cubital ner- 



vure cun-ed . . • 3- VARIUS, Grav. 



(3). 6. Terebra as long as abdomen ; (^ clypeus 



foveiform . . . . •4- DIVINATOR, Rossi. 



1. albicinctus, Grav. 



Ichneumon annulaforiiis, Fab. S. E. 330; Piez. 62, s (?). Ephialtes albicinctus, 

 Gr. I. E. iii. 259, ? ; Desv. Tr. Ent. See. 1862, p. 226, cT . Perithous albicinctus, 

 Holmgr. Sv. Ak. Handl. 1860, n. 10, p. 15, ? . 



Head of 9 ^vith the internal orbits, the palpi and base of the mandi- 

 bles, white; of the ^ with the face, the facial orbits and the mouth, pale, 

 with a very slight rufescent tinge. Antennae of ^ subsetaceous and a 

 little longer than half the body; scape pale, remainder testaceous, beneath 

 and infuscate above. I'horax cylindrical and not red-marked ; a line 

 before, and in 9 a callosity beneath, the radix whitish; prothorax im- 

 maculate. Scutellum and postscutellum of 9 apically flavidous-white. 

 Abdomen as broad as and thrice longer than the thorax, of ^ sublinear 

 and uneven with whitish pubescence; basal segment sessile, subcarinate 

 and canaliculate; the five basal 9 segments with their apical margin 

 flavidous-white; J with the two basal segments elongate and the re- 

 mainder quadrate; terebra slightly longer than the abdomen, black with 

 the spicula badious. Legs elongate, red ; J with the anterior coxae and 

 all the trochanters white ; front tarsi, tibiae and femora internally strami- 

 neous; hind tibiae and tarsi nigrescent, former in (J basally and intern- 

 ally, and latter in J with the first joint basally, white. Wings slightly 

 clouded, especially basally; stigma nigrescent, of J rather large; radix 

 and tegulae of 9 ferrugineous, of (5 white ; areolet sessile and subirregu- 

 lar, metacarpus of J infuscate. Length, J 8i, 9 15 — 18, mm. 



Fabricius' species is described as having the scutellum flavescent, thor- 

 acic marks and the four basal segments margined with flavous, and the 

 wings hyaline. Whatever name it may be known under nowadays /. an- 

 7iulatorius is certainly British, for it is recorded in Piez. (1H04) simply, 

 " Habitat in Anglia, ]\lus. Doni. Banks." 



Although Desvigncs described his J as a new species, I am of the 

 opinion that he intended it should be used in connection with that of 

 Gravenhorst, of whom alone he was a close student, and it was probably 

 the uncertainty of their relationship which led him to refrain from assoc- 

 iating the sexes — an uncertainty which still exists in these less scrupulous 

 times ! 



