158 MODERN SYSTEM, 



* Bo<}t/ elovgnted. 



Sp. 1. Ht/p. '['2-piistulutns. 



Inhabits ponds and ditches. 



** Bodi/ oval. 



Sp. 1. Hyp. coiifluens. 



Dytiscus confluens. Marsham. 



Inhabits ponds and ditches. 



Stirps 5. — All the tarsi with five articulations. 

 Genus 58. NOTERUS. Clairv., Latr., Uach. 



Antenna with a fifth or seventh joint dilated : hinder feet but slightly 

 adapted for swimming. 



Sp. 1. Not. Geerii. Oval, convex, brown: head and thorax ferrugine- 

 ous : elytra sprinkled with impressed dots : antennae of the male 

 thick. 



Dytiscus crassicornis of authors. Dytis clavicornis. De Gecr. 



Inhabits stagnant waters. 



Sp. 2. Not. sparstis. Elytra with impressed dots. 



Dytiscus sparsus. Marsh., i. 430. 



Inhabits stagnant waters near London. 



Genus 59. LACCOPHILUS. Uach, Edin. Encycl. vol. ix. 



AntenncE with the joints simple : hinder feet well adapted for swim- 

 ming. 



Sp. 1. Luc. hyalinus. 



Inhabits canals and slowly running waters. 



Sp.2. Lac. minutus. Greenish-testaceous: legs yellowish. 



Dytiscus minutus. Linne, Marsh., Gyll. 



Inhabits stagnant waters. 



C. With a sciitellum: hinder feet compressed and formed for swim- 

 ming: all the tarsi with five articulations. 

 Stirps 6. — Tttk posterior elongated : claxcs on the hinder feet didac- 

 tyle. 

 Genus 60. COLYMBETES. ClairviUe, Latr., Leach. 

 External maxillary palpi \\\i\i the second and tliird joint equal; fourth 



long, obtuse at the apex. 

 Sp. 1. Col. striatus. 

 Inhabits stagnant waters. 

 Sp. 2. Col. maculatus. {PL 3. fig- 15.) 

 Inhabits ditches. 



Gemis Gl. HYDATICUS. Leach, Edinb. Encycl. vol. ix. 

 External maxillary palpi with the second joint short, third and fourth 

 long bnt efjual and subulated: anterior tarsi of the male patelliform : 

 female with the thorax rough on both sides : elytra smooth. 



