The Scottish Naturalist. 



223 



42. Th. dist. , though slightly, emarginate at ba., widest 



at mid. ...... 



- straight at ba., widest in fir. of mid. Blackish, gr., 

 or bronzy. Legs, ba. of an., and ba. of pal. test. 

 E. very finely p. -s. I l /$ 1. B. 



43. Brassy b. Legs, ba. of an., and a red spot nearap. of 



each e. r. E. rather el., rather strongly p.-s. 6th 

 str. not dist. punc. so far as to mid. ofe. \ l / 2 1/ B.! 

 Very like prec. B. (not brassy). Legs and ba. of an. 

 test. Extreme ap. of e. often reddish. Th. broader 

 than in prec, moi-e narrowed behind, more rounded 

 on sides. E. shorter, with more rounded sides. 

 \ l /z 1. E. S. I. . . . . 



44. R. E. gen. clouded with fuscous. An. pal. and legs 



test. Th. very tr., its ba. angs. very sharp. Sides 

 of e. much rounded. E. very finely p.-s. 2^3 1. 

 J-J. o. J.. . . . . . . 



Obsc. gr. , sometimes bronzy. An. , pal. and legs test. 

 Th. extremely tr., its ba. angs. rather blunt. E. 

 very long, strongly p. -s. in fr. 2%. 1. B. 



Tachypus. 



Cop., marked with gr. Legs, pal. and ba. of an. more 

 or less test. Up. side of fern., pal., and istand2nd 

 j. of an. often gr. H., across eyes, hardly wider than 

 th. Th. cordate, hardly tr. E. pub., minutely 

 punc, ind. str., each with 2 consp. pits. 2^1. B. 



Very like prec. Pal., legs and ba. of an. more unif. 

 test. H., across eyes, dist. wider than th. Th. 

 dist. tr. E. more strongly punc 2 1. B. 



43 



obtusum 



guttula 



Mannerheimi 



I. 



2. 



rufescens 



quinquestriatum 



pallipes 



flavipes 



TABLE OF FAMILIES OF HYDRADEPHAGA. 



1. An. not shorter than h., having only 10 js. 



m M ™ "* ~j -I A Jo* • • • • • 



- shorter than h. 



2. Tar. with only 4 visible js. Sc invisible 



- dist. 5 j. Sc. (exc in Noterus and Laccophilus) well 



def 



3. H. deeply inserted in th. 



- protruded and dist from th. 



Haliplidae 



2 



Gyrinidse 



Hydroporidse 



Dytiscidse 

 Pelobiidae 



First family— HALIPLIDiE. (3 genera.) 



Space between the eyes not consp. less than diameter 

 of eye ...... 



- - - - very consp. less than diameter of eye 

 Tli. about same width in mid. as at ba. 



- much narrower in mid. than at ba. 



Cnemidotus 

 Brychius 

 Haliplus 



Cnemidotus. 

 Test. Some large b. puncs. at ba. of th. 



E. with 10 



rows of large b. puncs. , 1% ^ 



B. 



caesus 



