fy-S 
20 7 . 
COLYMBETES CONSOBRINUS. 
Order Coleoptera. Fam. Dyticidse Leach . Hydro- 
canthari Lat . 
Type of the Genus Dytiscus striatus Linn . 
Colymbetes Clairv., Lat., Leach, Sain, — Dytiscus Linn., Fab., Oliv., 
Gyll., Panz., Marsh. 
Antennae inserted close to the eyes at the base of the mandibles, 
subsetaceous, naked, 1 1 -jointed, basal joint not longer nor more 
robust than the 4th, 2d joint small and short, 3d and following 
nearly of equal length, the last truncated obliquely at the apex (6) . 
Labrum very broad and short, sides rounded, the centre emargi- 
nated and ciliated (1). 
Mandibles short, obtuse, subtrigonate, dilated obliquely at the 
apex which is truncated and emarginated, below which on the 
inside are 2 small teeth (2). 
Maxillae bent, acute, ciliated internally with rigid bristles. Palpi, 
internal biarticulate, slender, basal joint rather shorter than the 
terminal one which is slightly bent 5 external long, robust, 
4 -join ted, basal joint small, 2d and 3d of equal length, 4th, longer, 
truncated (3). 
Mentum transverse, deeply emarginate, the centre producing a 
broad truncated lobe. Palpi nearly as long as the maxillary, ro- 
bust, arising from large scapes, 3-jointed, basal joint short, the 
2d and 3d twdce as long, of equal length, the latter slightly curved 
and truncated obliquely. Labium large, quadrate, ciliated (4). 
Head broad rounded. Thorax broad and short, narrowed before, broad 
at the base. Scutellum distinct. Elytra large and ovate. Wings 
ample. Tibiae spurred, anterior the shortest, posterior the longest. 
Tarsi 5 -jointed, 4 anterior short, the 3 first joints dilated in the 
males (5, fore leg of male) ; hinder pair elongated and attenuated. 
Claws curved, excepting the posterior pair which are straight, and 
of unequal length. 
Consobrinus nobis. — elongatus Leach's MSS. 
Long, narrow, oval, shining, delicately and thickly punctured, 
dull furruginous. Head black, with a ferruginous spot on the 
crown. Thorax blackish, sides and anterior margin lurid, an 
abbreviated channel down the centre. Elytra with 3 faintly 
punctured striae on each, united towards the apex, the spaces 
between them dotted with black 5 the scutellum suture and 4 
streaks at the base of the same colour. Legs lurid, inclining to 
fuscous. 
Obs. the above description having been made 12 years since, it is 
not so complete as we could wish ; but it is hoped that the figure 
will sufficiently characterize the insect. 
In the Cabinet of Mr. Vigors. 
