COLEOPTERA. 
309 
(Steph.) must stand ; H. tinctus (Clark) = palustris ; Agahus is divided by 
Thomson into sections, here characterized; Agahus uliginosus (Payk.) 
changed to disiuir (Bold) on account of Ilyhius uliginosus (Linn.). 
Power (Entomologist, iii. pp. 79-80) remarks upon the occurrence of seve- 
ral species of this family near London, including Ilyhius suhceneus (Erichs.) 
now to Britain. Power also remarks upon the sexual characters presented by 
some species of Ilyhius, the cf having a series of longitudinal plicae on the 
lower surface of the abdomen, the $ a notch and ridge on its last segment. 
The differences of those sexual characters will serve, in Power’s opinion, for 
the discrimination of some doubtful species. 
Ilydroporus hrevis (Sahib.) is recorded as British by Crotch (Cat. Brit. 
Col.), and H. neglectus (Schaum) by Power (Ent. M. Mag. iii. p. 43). 
Ilydroporus vitiosus (Lee.). Variety noticed by Leconte, Proc. Acad. Nat. 
Sci. Phil. 1866, p. 365. 
Colymhetes notatus (Sturm) recorded as North American by Leconte, 1. c. 
p. 366. 
Ilydroporus ohesus, sp. n., Leconte, 1. c. p. 366, California ; AT. sellatus, Le- 
conte, ibid., Dacota. 
Colymhetes tostus, sp. n., Leconte, 1. c. p. 366, Nort hern States. 
GYRINIDiE. 
Gyrinus colymhus (Erichs.) and opacus (Sahib.) are recorded as British 
by Crotch. See Rye, Ent. Ann. 1867, p. 58. 
Gyrinus curtus, sp. n., Motschulsky, Bull. Soc. Nat. Mosc. xxxix. 1. p. 166, 
Japan. 
Palpicornia. 
Crotch (Entomologist, iii. pp. 111-112) remarks upon the following species 
of this family chiefly with regard to their synonymy : — Ilelophorus granu- 
laris, probably divisible into 3 or 4 species ; H. mulsanti (Rye) ; Ily drama 
sieholdi, name preferred to pygmatus (Wat.) on account of Ochthehius pyg~ 
mceus (Fab.) ; H. Jlavipes (Sturm) ; Ilydrohius atricapillus (Payk.) ; Hydro- 
hius globulus (Payk.) ; Berosus signaticollis (Charp.), older than B. cericeps 
(Curt.) ; Limnehius picinus (Marsh.) = nitidus (Marsh.); Cercyon marinum 
(Thoms.) ; C. plagiatum (Erichs.) ; C. ceatromaculatum (Sturm) ; and Me- 
gastemum holetophagum (Erichs.). 
Limnehius. Of the larger species of this genus Gerhardt (Berl. ent. Zeits. 
1866, pp. 395-404) records the occurrence in Germany of 2 hitherto un- 
noticed. These raise the number to 4 ; and, as their distinctive characters 
have hitherto been but imperfectly indicated, Gerhardt describes them in 
detail. The 4 species are : — L. truncatellus (Thunb.), 1. c. p. 396 ; L. pappo^ 
sus (Redt.), 1. c. p. 398; L. truncatidus (Thoms.), 1. c. p. 400; and L. nitidus 
(Marsh.), 1. c. p. 402. On p. 404 the author gives schematic tables for the 
determination of the species. 
Limnehius suturalis, sp. n., Leconte, Proc. Acad. Nat. Sci. Phil. 1866, p. 366, 
Northern States. 
Ilelophorus dorsalis (Muls. me Marsh.) is named II. mulsanti by Rye, Cat. 
British Beetles. 
Ilelophorus nanus (Sturm). Power records the reappearance of this 
species in Britain, Ent. M. Mag. iii. p. 79. 
Ilelophorus fortis, sp. n., Leconte, 1. c., San Francisco. 
