<5rS4 



ENTOMOLOGY. 



cavity of the eye. Feet perfectly contractile. Man- 

 dibles very prominent. 



Genus CXXX. Hister.* Linn. Fabr. &c. 



Attelabus Geoffroy. 



Body somewhat quadrate. Thorax transverse. Scu- 

 tcllum small. Elytra shorter than the abdomen. Breast 

 very large. Head intruded into a concavity in the an- 

 terior part of the thorax. Palpi filiform, short, unequal, 

 the last joint somewhat cylindric, obtuse. 



* Body depressed, the breadth exceeding the height. 

 Tibiae broad, somewhat triangular. Tarsi short. 



a. Body not very much depressed. 

 Sfi. I. Unicolor. 



Bister unicolor. Linn. Fabr. See. 

 Inhabits dung. 



b. B<nly very much depressed. 

 Sfi. 2. Planus. 



Uister fdanus. Fabr. 

 Inhabits beneath the bark of trees. 

 » * Body very thick and high. Tibiae narrow, elon- 

 gate. Tarsi slender. 

 Sfi 3. Sulcatus. I 



Hister sulcatus. Rossi, Latr. 

 Hister striatus. Fabr. Herbst. 

 Inhabits the dung of oxen and horses. 



Subdivision 3. 



Antennae strait, not inserted in the cavity of the 

 eyes. Feet semicontractile. 



Genus CXXXI. Nosodendron. Latreille. 



BiiuiHUS. Olivier. 



Si'ii^ehidium. Fabr. Panzer. 



Antennae terminated abruptly by a three-jointed per- 

 i'oliated club, composed of three joints. 



Sfi. I. Fasciculare. Black, shining, distantly punc- 

 tured; thorax linear, trausverse ; elytra with elevated, 

 hairy, brownish smoke-coloured dots. 



Sfi/iaridium fasciculare. Fabr. 



Byrrhusfascicularis. Olivier. 



JVosodendron fasciculare. Latr. 



Inhabits France and Germany, under the bark of 

 elms. 



Genus CXXXII. Limnius. Miiller, Gyllenhall, Me- 

 gerlei. 



Dytiscus. Panzer. 



Chrysomela. Marsham. 



Ei.mis. Latr. 



Antennae nearly filiform, the last joint largest, some- 

 what oval. 



Sfi. 1. Vokkmari. 



Dytiscus Volckmari. Panzer, Faun. Ins. Germ. fas. 7. 

 fig. 4. 



Limnius Volckmari. Miiller. 



Elmis Volckmari. Latr. 



Chrysomela bufirestoidea. Marsh. 



Subdivision 4. 



Antennae inserted in the anterior canthus of the eye. 



Genus CXXXIII. Parnus. Fabr. Illiger, Marsh. 



Der.'.esies. Geoffroy. 



Elateu. Rossi. 



Dryops. Olivier, Lamarck, Latr. 



Sfi. 1. Auriculatus. 



Dryofis Auriculatus. Latr. Olivier. 



Division II. 



Tarsi with four distinct joints. 



Genus CXXXIV. Heterocerus. Bosc, Fabr. Ilhg 

 Latr. Marsham. 



Antennae composed of eleven joints, the seven last 

 forming a dentate or serrated mass. 



Sfi. 1. Marginatus. Blackish, villose ; sides of the 

 thorax and abdomen, with spots on the elytra, margins 

 of the abdomen, and feet, pale luteous. 



Heterocerus marginatus. Fabr. Bosc, Illiger, Panzer, 

 Marsham. 



Inhabits marshy places, burrowing in the muddy banks 

 of ponds. 



Genus CXXXV. Georissus-I Latr. 



Pimei-ia. Paykull, Fabr. 



Antennae nine-jointed, the three last joints forming a 

 rounded nearly solid mass. 



Sfi 1. Pygmita. 



Pintelia fiygmaa. Paykull, Fabr. 



Georissus fiygmaus. Latr. 



Tribe XVI. Hydrophiudes. 



Antennae terminated by a club. Maxillary palpi very 

 long. Chin or mentum large, clypeiform. Head with 

 the front rounded, cowl-shaped. Feet formed for swim- 

 ing. Tarsi with the first joint shorter than the second. 



Family I. Helofihe'rida. 



Mandibles without teeth at their extremities. Maxil- 

 lary palpi generally much shorter than the antennae. 

 Body oblong. Thorax somewhat quadrate, or nearly 

 scmiorbiculate, or somewhat cordate-truncate. Tibia 

 slightly shines. Tarsi filiform, not ciliated, with two 

 strong, acute, entire nails. 



Genus CXXXVI. Helophorus. Leach. 



Elopiiorus. Illiger, Fabr. Latr. Olivier. 



Hydrophilus. De Geer, Marsham. 



Clypeus entire. Palpi with the last joint oval, thick; 

 maxillary palpi much shorter than the antennae. 



* Body elliptic, as somewhat ovate. Thorax broadcv 

 than long. 



Sfi. 1. Aquatkus. 



Elopiiorus grandis. Illiger. 



Elo/i/wrus acjuaticus. Fabr. Olivier, Latr. 



Inhabits ditcnes and stagnant pools of water. 



** Body nearly linear; thorax elongate-quadrate. 



Sfi. 2. Klongatus. 



Jilofihorus elongatus. Fabr. Latr. 



Inhabits stagnant waters in England, France and 

 Germany. 



Genus CXXXVII. Ochthebius. Leach. 



Hydr^ena. Latr. Illiger. 



Hyurophilus. Marsham. 



Elopiiorus. Paykull. 



Clypeus entire. Palpi with the last joint slender, 

 acuminate j maxillary ones shorter than the antennae. 



Sfi. 1. Rifiana. 



Hydr&nu rifiaria. Illiger, Latr. 



Elofi/ierus firygmaus. Paykull. 



JUu/i/irrus minimus. Fabr. 



Hydrofihilus imfiressus. Marsham. 



Inhabits Che utters of Europe. 



Sfi. 2. Marinue. 



• This genus seems to constitute a peculiar family, and might be divided into some very natural genera. 



f This singular genus has the lip and maxillie of Helophorus ; the general habit of Jiyrrhus ; and the tarsi of Ucttrocerus. 



