186 
MODERN SYSTEM. 
Genus 142. HELOPHORUS. Leach, Elophorus. Fair., Oliv 
Latr., Gyll. 
Lyes sessile : thorax transverse. 
* Thorax and elytra furrowed. 
Sp. 1. Eel stagnalis. Hydrophilus stagnalis. Marsh, 
Inhabits ponds, floating on the surface and walking on aquatic plants. 
** Thorax and elytra with elevated lines. 
Sp. 1. Eel. nubilas. Gyll. 
Genus 143. IIYDROCHUS. Gcrmar., Leach, Elophorus. Fabr., 
IMig; l)'C. 
Eyes rather prominent : thorax elongated. 
Sp. 1. Hydr. cicindeloides . Hydrophilus cicindeloides. Marsh. 
Inhabits ponds, and may frequently be found in the mud at the sides. 
Stirps 2. — Clypeus entire. 
Genus 144. OCUTHEBIUS. Leach's Edinb. Encycl. — Zool. Misc. 
rol. iii. Elophorus. Fabr. IIydr.'ena. Latr., Illig. 
Maxillary palpi with the middle and last joint slender and acute. 
Sp. 1. Och. riparius. Leach. Hydrophilus impressus. Marsh, 
Genus 145. II Y DR/ENA. Kugellan, Leach. 
Maxillary palpi with the last joint long and acuminated. 
Sp. 1. Eyd. Kugellani. Leach. Hydro, longipalpus. Marsh , 
Fam. XX. Hydrophilidje. 
Mandibles at their points bidentate : body oval or round : antenna ter- 
minated by a club. 
Surfs 1. — Clypeus emarginate : sternum simple : antenna with six ar- 
ticulations. 
Genus 146. SPERCIIEUS. Fabr., Latr., Leach. 
Sp. 1. Sper. sordidus. Spercheus sordidus. Fabr. Hydr. sordidus, 
Marsh, 
Inhabits stagnant waters. 
Stirps 2. — Clypeus whole : sternum simple. 
A. Elytra with the apex whole. Scutellum small. 
Genus 147. BEROSUS. Leach's Zool. Misc. vol. iii. 
Body narrow before : thorax convex : eyes rather prominent. 
Sp. 1. Bar. luridus of authors. 
Inhabits ponds. 
