240 British Species of the Genus Ster)oj)hylax. 



belono- to a group of nearly related species, of which there are 

 many in Europe, and mostly undescribed. At any rate I have 

 thought it best to refer the present insect to the above species, 

 rather than to run the risk of causing a probably superfluous 

 synonym by describing it as new. 



B. Anterior wings scarcely dilated towards the apex ; the hind 

 margin obliquely truncated. 



S. ? concentricus, Kol. (PI. IX. fig. 9.) 



Goniutaulius concentricus, Kol. Gen. et Sp. Trichop. p. 55, 10 ; 

 Limnephilus Vihex, Brauer, N. A. p. 51, 13, fig. QQ, 67 (nee 

 Curtis, Steph.) 



Antenna brown, obscurely annulated with darker ; head, pro- 

 thorax and basal joint of antennae clothed with long, pale yellow 

 hairs ; abdomen greyish-black, the terminal segment paler ; legs 

 pale ochreous, with black spines ; anterior wings pale shining 

 greyish-yellow, the costal half entirely very pale yellow, and 

 numerous small pale yellow spots are sprinkled over the rest ot 

 the wing (sometimes the wings are entirely pale yellow, with 

 scarcely a trace of the darker ground colour, and at others the 

 wings towards the dorsal margin and apex are freckled with grey- 

 ish-fuscous) ; veins, especially those of the anastomosis, pale fus- 

 cous ; posterior wings hyaline, tinged with yellowish at the apex. 



Upper margin of last abdominal segment rounded and slightly 

 produced into a lip, which is rolled under and covered with short 

 black setae ; appendices superiores large, obtusely spoon-shaped ; 

 appendices inferiores long, dilated towards the tips and somewhat 

 approximating; lower sheaths widely divergent, curved suddenly 

 inwards at the tips ; penis considerably exserted. 



Long. Corp. 6 lin. ; exp. alar. 15 — 16 lin. 



Appears from August to the end of October. First discovered 

 in this country in the Norfolk Fens by Mr. Winter of Aldeby, and 

 seems to be rather common there. Two specimens have been 

 taken by Mr. P. C. Wormald at Willesden, Middlesex, and I have 

 a specimen from Hartlepool. This species is widely spread over 

 the Continent of Europe, and is subject to considerable local 

 variation, Kolenati's typical specimens from Russia being much 

 smaller and darker. 



The scarcely dilated anterior wings and obliquely truncated hind 

 margins indicate the aflinity of this species with Limnephilus and 

 Anabolia ; otherwise in general appearance it resembles Steno- 

 p/iylax, and, having been placed in this genus by Dr. Hagen 

 (Stett. Entomol. Zeit. 1859, p. 133), it is retained here. 



