38 BRITISH ICHNEUMONS. [Microcryptus. 



nitidulous, red ; apically sub-compressed and laterally pubescent ; basal 

 segment long and somewhat slender, black and apically red in the centre, 

 a little shorter than the terebra, with the spiracles not prominent. Legs 

 red ; posterior femora centrally, the hind tibiae, except at their base, and 

 their tarsi entirely, black. Wings clouded ; radix and tegulae red ; areolet 

 pentagonal, with the external nervure obsolete. Length, 8 mm. 



Marshall says that this female might be referred to the genus Ichneumon 

 if its terebra were not exserted. He makes no mention of a mesopleural 

 sulcus, but adds that it is allied to P. desertor, Grav., from which it differs 

 in the number of white flagellar joints, the coloration of the legs and in the 

 sculpture of the metathorax. 



" One specimen from the London District " (Marshall). It does not 

 appear to have been found nor acknowledged on the Continent. The type 

 is in the British Natural History Museum. 



13. arridens, Grav. 



Phygadenon arrideus, Gr. I. E. ii. 654; Tasch. Zeits. Ges. Nat. 1865, p. 45, <J . 

 P. iiiiprobiis, var. 2, Gr. I. E. ii. 672,9. P. prohus, Tasch. Zeits. Ges. Nat. 1865, 

 p. 42,9; cf. Bridg. Trans. Ent. Soc. 1881, p. 152. Ichneumon niveatits, Desv. Cat. 

 25, c5 ; cf- Mori. E.M.M. 1902, p. 123 et Ichn. Brit. i. 134. Microcryptus arridens, 

 Thoms. O. E. ix. 859, 6 9 • 



Head black, strongly narrowed behind the eyes ; epistoma convex, 

 clypeus discreted ; frontal orbits in both sexes, and in $ the face, cheeks 

 and mouth, white. Antennae of $ setaceous, nigrescent, and nearly as 

 long as the body, with the scape white beneath ; of $ with joints seven 

 to eleven white, and the basal ones rufescent below. Thorax black ; 

 mesonotum sub-glabrous, centrally depressed, with distinct notauli ; apo- 

 physes wanting, the obsoletely discreted petiolar area not reaching beyond 

 the centre of the finely rugulose metathorax, which has the areola in 9 

 more or less elongate and distinctly indicated, and in $ sub-quadrate ; 

 spiracles very small and sub-circular, metapleurae not rugose ; $ with 

 pronotum anteriorly and laterally, and two callosities before the radix, 

 white. Scutellum of c? either entirely or apically white ; of $ immaculate. 

 Abdomen elongate-ovate and as broad as thorax in ? , narrower than the 

 thorax and oblong-fusiform in the $,; black, with the second to fourth 

 segments, apex of the first and in $ the fourth discally or apically red, 

 with the following sometimes pale-margined and the ? anus white ; post- 

 petiole glabrous and gradually dilated towards the apex, of $ slender, with 

 distinct carinae, of $ deplanate and distinctly margined laterally ; terebra 

 straight and one third shorter than the abdomen. Legs slender and red ; 

 the apices of the hind femora, and in $ nearly the apical half of their 

 tibiae, black ; $ with the front trochanters, $ with the hind coxae and 

 bases of their trochanters and their tarsi, also black ; anterior coxae and 

 trochanters of $ white. Wings hyaline ; radix and the $ tegulae white. 

 Length, 5-8 mm. 



This species may at once be known from all the rest of the genus by its 

 posteriorly narrowed head, nearly smooth and distinctly sulcate meso- 

 pleurae, smooth and shining abdomen, with the segments two to four of 

 the $ red or basally dark castaneous, the elongate $ antennae of which 

 seven flagellar joints bear elevated lines ; by those of the $ being apically 



