442 Messrs. G. R. Crotch and D. Sharp’s Additions 
11. Slenus annulatus. 
S. niger, vix aneo-micans, parcissime pubescens ; capite thorace 
dimidio latiore, fortiter punctato, late bisulcato, vertice levi ; 
thorace paullo longiore quam latitudine sua, sat crebre 
inzequaliter punctato ; elytris thorace tertia parte longioribus, 
sat.crebre et fortiter punctatis, obsolete tri-impressis ; abdo- 
mine late marginato, basi fortiter apice subtiliter punctato ; 
antennis palpisque testaceis, illis articulo primo infuscato ; 
pedibus testaceis, geniculis posticis distincte nigris. 
Long. 2 lin. 
St. impresso valde affinis, et elytris longioribus geniculisque pos- 
ticis nigris tantum distinctus. In Anglia cum Sté. impresso 
haud rarus, 
By no means rare in the London district, and scattered through- 
out England; it very closely resembles St. wmpressus, Germ., 
and is possibly a winged form of it. 
Dr. Kraatz, to whom specimens were sent some years back, 
returned it as new. It must be very near St. flavipalpis, 'Thom- 
son, but that should have much shorter elytra, according to the 
description ; nevertheless when three years ago I saw his types 
I made a note that it appeared to me to come near St. impressi- 
pennis and to have longer elytra.x—G. R. C. 
SPECIES PREVIOUSLY DESCRIBED BY ConTINENTAL AUTHORS. 
1. Gyrinus colymbus, Er. Kaf. 191. 
A few specimens of this species were placed among G. ma- 
rinus @ in my collection; the red reflexed margin at once distin- 
guishes it.—G. R. C. 
2. Gyrinus opacus, Sahlb. Ins. Fenn. 47. 
M. Scriba records this species from England in his paper, 
Stett. Ent. Zeit. 1842, p. 11; it appears to be not uncommon and 
to be most nearly allied to G. marinus.—G. R. C. 
3. Parnus nitidulus, Heer, Faun. Col. Helv. 467. 
A single specimen taken by me at Aberlady near Edinburgh 
last July.—D. S. 
4, Elmis (Limnius) troglodytes, Gyli. iv. 395. 
~A few specimens of this species were placed with the com- 
