250 . 
OCHTHEBIUS HYBERNICUS. 
Order Coleoptera. Fam. Helophoridae Leaclu 
Type of the Genus Hydrophilus impressus Marsh. 
Ochthebius Leach., Sam., Gyll., Steph. — Hydraena Lat., III. — Elo- 
phorus Fab., Payk. — Hydrophilus Marsh. 
Antennce inserted close to and before the eyes, 11-jointed, basal 
joint very long, slightly curved, producing 2 bristles, 2nd shorter 
robust, ovate, 3rd and 4th minute and obscure, 5th and 6th 
rather small, the latter cup-shaped ; the remainder forming a 
large very pubescent club, the 7th joint being the smallest and 
orbicular, the 3 following cup-shaped, the terminal one sub- 
rotund (6). 
Labrum semiorbicular, slightly notched and ciliated (1). 
Mandibles short and broad, the apex emarginate, below which is 
a long tridentate tooth, a portion of the internal margin mem- 
branous (2). 
Maxillce short horny and cleft towards the apex, the superior por- 
tion armed with small teeth, the inferior composed of broad crowd- 
ed dentiform spines. Palpi scarcely so long as the antennae and 
much longer than the maxillae, 4-jointed, basal joint small, 2nd 
and 3rd of nearly equal length, the former subclavate, the latter 
robust, obovate-elongate, 4th slender, linear, much shorter (3). 
Mentum large, suborbicular, the sides emarginate, posterior 
angles truncated. Palpi very small, triarticulate, basal joint 
the stoutest. Labium broad and short slightly emarginate and 
pubescent (4). 
Head lengthened and narrowed anteriorly. Clypeus entire. Eyes small, 
globose and prominent. Thorax transverse oblong, slightly produced 
over the Scutellum which is triangular. Elytra rather broader than 
the thorax, suboval. Wings twice as long as the elytra and, almost 
destitute of nervures. Tibiae compressed, dilated towards the apex, 
anterior serrated on the outside. Tarsi lb -jointed, the basal joint very 
imperfect, 2nd and 3rd short, not so long as the 4th, and the 5th as 
long as the others united. Claws long, slender and bent (5, a fore 
leg). 
Obs. The dissections are from O. hybernicus Nob. 
Hybernicus Nob. 
Dull cupreous, sometimes inclining to black sparingly covered 
with long whitish hairs. Palpi and antennae ochreous, rather 
fuscous at their tips. Head and thorax punctured, the former 
with 3 foveae on the crown of the head, one close to the base $ 
the latter with the anterior margin and the posterior angles 
membranous and transparent 5 a deep channel between 2 long 
foveae on the back and a large depression at each of the angles. 
Elytra not striated, but covered with large deep punctures, ap- 
pearing rather regular under a weak lens, but scattered under a 
high power. Legs ferruginous, the tarsi piceous at their tips. 
In the Cabinets of Mr. Holiday and the Author. 
