118 HYDKADEPHAGA — DYTISGIDAE. 



Male with first four joints of posterior tarsi with swimming 

 hairs beneath. L, 3| 1. Not common. 



A. striolatus, Gyll. 

 -B 2?. Network on upper-side rather diffuse, 

 scratches without any definite direction. 



Oval, rather flat. Black, male rather shiny, female less 

 so ; legs pitch-Llack, knees and tarsi reddish ; each elytron 

 with an obscure pale dash at side near apex ; rows of punc- 

 tures on elytra rather strong, male with a little tooth at 

 base of inner claw^ of anterior tarsi and with swimming 

 hairs beneath two joints of posterior tarsi. L. 4^ — Ah 1. 

 A single specimen in Dr. Power's collection. 



A. tarsatus, Zett. 



2. Elytra black or brown, with sides lighter. 



A A. Hinder process of prosternum with feeble 

 central ridge and sharp side edges ; irregidar 

 rows of punctures on elytra distinct ; anterior 

 tarsi of male not strongly dilated. 



u II, Disc of elytra blackish-bronze, posterior 

 tibiae and tarsi blackish ; posterior tarsi of 

 male with swimming hairs beneath first joint 

 only. 



Oblong oval, not very convex. Upper-side bronze-black, 

 witli a very close and fine network of scratches ; sides of 

 thorax and elytra lighter ; under-side black ; refiexed 

 margin of elytra brown-red ; legs reddish pitch-brown, 

 posterior tibiae and tarsi and middle of all femora blackish. 

 L. 4 1. Common. A. chalconotus, Panz. 



h I), Disc of elytra brown ; posterior tibiae 

 and tarsi red ; posterior tarsi of male wdtli 

 swinnning hairs beneath three joints. 



Oval, slightly convex. Head and thorax with a fine and 

 close network of scratches, black, with metallic lustre, 

 latter with raised side margin sometimes redtlish ; elytra 

 very finely shagreened, brown, with metallic lustre, sides 

 and base lighter ; under-side black ; reflexed margin of 

 elytra yellow-brown ; legs rust-red, femora blackish. L. 3^ 

 — 3^ 1. Eather common. A. congener, Thunb. 



li Ji. Hinder process of prosternum fiat ; irregu- 

 lar rows of punctures on elytra indistinct or 

 absent ; anterior tarsi of male strongly dilated. 



