The Scottish Naturalist. 



259 



2. E. sprinkled with large coarse puncs. . 



Not as above ...... 



\. One of the 2 claws of the hi. tar. consp. longer than the 

 other ...... 



The claws of about equal length 

 \. An. short and stout (hardly, if at all, longer than h. and 

 th.). Body extremely con v. The shorter claw on 

 hi. tar. cons, more than ^ longer one. 

 Not as above. ...... 



5. Th. not dist. punc. ..... 



- thickly and consp. punc. Ant. tar. of 6 much as in 



Hydatkus. E. of ? with consp. hairy furrows. 



6. Claws of ant. tar. hardly, if at all, shorter than ap. j. 



of ant. tar. Ant. tar. of £ with, at most, moderately 

 dilated js. . 



- - - - consp. shorter than ap. j. of ant. tar. Ant. tar. 



of 6 with 1st 3 js. many times wider than 4th. 



7. Less than 6 1.. 



More than 6 1. Ant. tar. of 6 as above (in Hydatkus). 

 E. of ? gen. with some deep furrows. E. of 6 with 

 3 rows of consp. puncs. .... 



8. The ba. 3 js. in interm. tar. of <J strongly tr. 



Not as above . .... 



NOTERUS. 



Reddish. E. darker. Smooth and shining. E. with 



3 irreg. rows of puncs. Breast flat. Js. 5 and 6 in 

 an. of 6 very tr.j the rest much narrower. i}<( 



1. Hi. ...... 



Very like prec. Larger and paler. E. with irreg. 

 coarse puncs. not in rows — most puncs. near ap. An 

 elev. keel on breast. J. 5 in an. of 6 very wide, 

 6-10 narrower, 1 1 very narrow. 2 1. E. . 



Laccophilus. 



1. Well def. pale markings across the ba. of e. 

 U.-s. test. Smooth, shining. H., th., an, 



test, brown. E . gen. darker ; along each side mar. 



4 greenish test, spots, which are often ind. or obs. 

 Th. much prod, backw. in mid. of ba. 2 1. E. S. I. 



2. Very like prec. The markings dist. and, in addition, 



some irreg. ones of same color across ba. of e. Ba. 

 of th. hardly prod, backw. 2 1. E. S. I. ! 

 Narrower than prec. 2. B. or nearly so. An. , legs, 

 th. (exc. ba. and fr.), and some markings near ba. and 

 ap. and on mars, of e., very consp. yel. U.-s. 

 brown. Ba. of th. hardly prod. I ^3 1. E. s - 



COLYM BETES. 



I. E. finely wrinkled transversely. Brown. Fr. (and 



some marks on disc) of h. , side mar. of th. and e. , 



and gen. the tib. and tar., test. On disc of e. 3 



more or less dist. rows of puncs. 7^ !• E. S. I. ! . 



and legs, 



Noterus 

 Laccophilus 



4 

 7 



Ilybius 

 5 



Acilius 



Colymbetes 



Hydaticus 

 8 



Dytiscus 



Leiopterus 



Agabus 



clavicornis 



sparsus 



minutus 



hyalinus 



variegatus 



fuscus 



