i'/tdf 
359. 
HYDROCHUS ELONGATUS. 
jy 
Order Coleoptera. Fam. Helophoridae Leach. 
Type of the Genus , Elophorus elongatus Fab. 
Hydrochus Germ., Lea., Sam . — Elophorus Fab., Oliv., Panz., Gyll. 
— Hydrophilus Mars. 
Antennae, inserted close to the anterior margin of the eyes at the 
base of the mandibles, shorter than the head and concealed be- 
neath it, clavate, 7?-jointed, basal joint long, curved and clavate, 
2nd shorter sub-oval, 3rd and 4th minute, the latter internally 
pubescent, the remainder forming an elongated club, very hairy 
on the inside, 5th and 6th joints somewhat hatchet-shaped, 7th 
long and conical (6). 
Labrum transverse-oval, the margin densely ciliated (1). 
Mandibles very convex externally, acute at the apex, a portion of 
the internal margin membranous and pubescent (2). 
Maxillce rather long, internal lobe small, curved and ciliated, 
external large, bent inward and terminated by numerous strong 
curved hairs. Palpi long 4-jointed, basal joint minute, 2nd and 
3rd long subclavate, 4th very long, subfusiform (3). 
Mentum transverse, anterior angles rounded. Lip broad and 
short, densely ciliated. Palpi very remote and small, triarticu- 
late, 1st and 2nd joints subglobose, 3rd the largest obovate (4). 
Head porrected , broad and subtrigonate. Eyes lateral prominent and 
globose , not touching the Thorax which is subquadrate. Scutellum 
minute. Elytra broader than the thorax , very long and somewhat 
elliptical. Wings ample. Legs of equal length, very similar , 
slender, the anterior appearing long. Tibiae compressed . Tarsi 
long and 4-jointed, 3 first joints short, 4th very long and clavate. 
Claws long and curved (5 a fore leg). 
Elongatus Fab. Ent. Syst. 1. 204. 3. — Gyll. 1.131. 7. — Panz}. 26. 7 
— Curtis's Guide , Gen. 105. 1. — cicindeloides Mars. 411. 28. 
Eneous, sometimes blackish. Trophi and legs castaneous, an- 
tennae ochreous, club and base of the mandibles and tips of the 
tarsi black. Head and thorax strongly punctured, the latter with 
a deep fovea on each side, also one in the centre and 2 at the 
base. Elytra with 1 0 deeply punctured striae on each, the suture 
and alternate spaces being elevated, that between the 2nd and 
3rd striae not extending beyond the middle and the space between 
the 3rd and 4th striae elevated only from the middle towards the 
apex. 
In the Author's and other Cabinets. 
