186 PALPICUKNIA — HYDKOPHILIDAE. 



0]»loiig. Head and thorax bronze, latter punctured in 

 wrinkles, sides sinuate ; elytra gray, with punctured striae. 

 L. 2| — 3 1. Common. H. aquaticus, Lin. 



jB. Elytra without short row of punctures at base. 

 a. Inner lateral furrows on thorax curved. 

 T. Interstices on thorax granulate. 



1. Palpi wholly or chiefly light-coloured. 

 A A. Thorax iridescent. 

 a a. Length If — 2 lines. 

 Oblong. Head and thorax bronze-green; elytra yellowish- 

 gray, with cloudy spots and a pale spot (often indis- 

 tinct) behind middle. Thorax with lateral ridges more 

 distinctly granulate than inner ones ; elytra with crenate 

 striae. Moderately common. R. Mulsanti, Eye. 



h b. Length 1^ lines. 



Oblong, Head and thorax greenish-bronze, latter dis- 

 tinctly narrowed at base, with light yellow anterior and 

 side margins ; elytra yeUow-brown, with darker spots, with 

 punctured striae, interstices tiat, each with a row of fine 

 punctures. Common. H. (jriseus, Herbst, 



c c. Length 1| lines. 



Oblong oval. Head and thorax bronze, latter narrowed 

 at base ; elytra dark brown-yellow, with indistinct l)lack 

 spots and a distinct dark sj)ot behind middle near suture. 

 Elytra with deeper punctured striae than in H. (/riseus, 

 interstices narrower, legs darker, and tliorax more distinctly 

 granulate. Common. H. gramilaris, Lin. 



li JB. Thorax not iridescent. 



Oldong-ovate. Brown-bronze, rather shiny ; elytra 

 oljscurely red-yellow, with some bronze reflection ; femora 

 and tarsi brown-yellow at apex. Elytra with strongly 

 punctured striae, interstices convex. L. 1| — 2 1. Common. 



II. aenei2)C7inis, Th. 



2» Palpi brownish. 

 Oblong oval. Head and thorax metallic ; elytra brownish- 

 red, with a connnon black spot (V-shaped, with apex 

 forward) behind middle, and otlier indistinct dark spots ; 

 l)al])i and legs brownish. Tliorax coarsely and closely 

 granulate between the furrows ; elytra with deep notched 



