258 



The Scottish Naturalist. 



Dark brown. Legs, mars, of th., ba. of an., and 

 mar. and often fir. part of e., r. U.-s. obsc. r. 



41. Side mars, (at least) of th. broadly r. or test. 



El. Very conv. Spar. Pub. Strongly and rather 

 closely punc. H. reddish. Th. b. (mars, some- 

 times very narrowly r.). E. brown, paler at ba. 

 and mars. Legs and ba. of an. r. Ap. of an. pit. 

 Mar. ofth. broad. 2 3 1. B. 



El. Rather flat. Pub. Closely and very finely punc. 

 Colored much as prec. Mar. of th. very narrow. 

 1% L E. & I. 



42. Hi. half (at least) of u.-s. ofth. b. . 

 - - of u.-s. ofth. for the most part test. 



43. El. ; widest behind mid. Very conv. Densely pub. 



Strongly and closely punc. , exc. disc of th. which 

 is almost impunc. H., legs and ba. of an. test. 

 Th. and ap. of an. b. E. brown. Sides of th. and 

 ba. of e. paler. 9 often duller and more finelv punc. 

 \% 1. E. S. I. ! . . . ' . er 



Resembles prec. in shape ; flatter, and narrower behind. 

 Whole surface very much more finely, closely and 

 evenly punc. H. and th. b. Mars, of th. widely 

 test. E. brown, widely test, at ba. Legs and ba. 

 of an. more or less test. 2 1. E. sw - 



44. Th. or e. or both (exc. in extreme vars.), with dist. 



markings ...... 



Pale brown. E. and ap. of an. darker. H. -b. blackish. 

 Disc of th. often a little dusky. EL, narrow, pub. 

 Thickly and rather strongly punc. A rather well 

 def. ba. fov. on each side on th. \% 1. B. 



45. EL, narrow, very pub. Thickly and very faintly 



punc. Th. with no dist. ba. fov. H., legs and ba. 

 of an. test. Th. pale brown ; disc dusky. E. 

 blackish ; ba. , mars. , and ap. , more or less marked 

 with clear yel. (Varies from almost b. with fr. of h. 

 and sides of th. test, to unif. pale test.) 1^ 1. 

 E. S. I. ! ! . 

 Very like prec. Shorter and broader, with more 

 rounded sides. Darker in color, especially the e., 

 which have only the ba. and mars, narrowly pale. 



t3 1 "R 



It it JJ» ■••••■ 



Extremely close to palustris. Broader, with more 

 rounded sides. Less pub. (especially th.), more 

 shining. A little less faintly punc. Colored much 

 as palustris, exc. that the pale markings on e. are 

 not well def. \}i 1 B. N - . 



dorsalis 

 42 



rufifrons 



umbrosus 



43 



44 



ythrocephalus 



marginatus 

 45 



angustatus 



palustris 



vittula 



Fourth family— DYTISCID/E. (9 genera. ) 



1. Sc. obs. 

 - well def. 



incog)iitus 



2 

 3 



