158 
MODERN SYSTEM. 
* Body elongated. 
Sp. 1. Hyp. il-pustulutus. 
Inhabits ponds and ditches. 
** Body oval. 
Sp. 1. Hyp. cmjluens. 
Dytiscus confluens. Marslmm. 
Inhabits ponds and ditches. 
Stirps 5. — AH the tarsi with live articulations. 
Genus 58. NQTEHUS. Clairv., Lair., Leach. 
Antenna with a fifth or seventh joint dilated: hinder feet but slightly 
adapted for swimming. 
Sp. 1. Not. Ceerii. Oval, convex, brown : head and thorax fetrugino- 
ous : elytra sprinkled with impressed dots : antenna: of the male 
thick. 
Dytiscus crassicomis of authors. Dytis clavicornis. Be Geer. 
Inhabits stagnant waters. 
Sp. 2. Not. sparsus. Elytra with impressed dots. 
Dytiscus sparsus. Mursh., i. 130. 
Inhabits stagnant waters near London. 
Genus 59. LACCOPHILUS. Leach, Edin. Encycl. vol. ix. 
Antenna with the joints simple : hinder feet well adapted for swim- 
ming. 
Sp. 1. Lac. hyti.lt tilts. 
Inhabits canals anti slowly running waters. 
Sp. 2. Lac. minutus. Greenish-testaceous : legs yellowish. 
Dytiscus minutus. Lome, Marsh., Gyll. 
Inhabits stagnant waters. 
C. With a. scutellum : hinder feet compressed and formed for swim- 
ming: all the tarsi with five articulations. 
Stirps 0 . — Tibia posterior elongated : claws on the hinder feet didac- 
tyle. 
Genus 60. COLYMBETES. Clairvillc, Lair., Leach. 
External, maxillary palpi with the second and third joint equal ; fourth 
long, obtuse at the apex. 
Sp. 1. Col. sfriatus. 
Inhabits stagnant waters. 
Sp. 2. Col. muculatus. ( PL 3. fig. 15.) 
Inhabits ditches. 
Genus 61. IIYDATICUS. Leach, Edinb. Encycl. vol. ix. 
External maxillary palpi with the second joint short, third and fourth 
long but equal and subulated : anterior tarsi of the male patellifortn: 
female with the thorax rough on both sides : elytra smooth. 
