466 Mr. David Sharif's revision of the 



expressed. Indeed in Broun's ' Manual of New Zealand 

 Coleoptera ' there are described eight or nine species 

 which I have been unable to identify, and several of 

 which are no doubt valid species. It must not be for- 

 gotten also that the study of these insects, except so far 

 as regards those of the temperate regions of the 

 Northern Hemisphere, is very little advanced, so that it is 

 really premature to generalise as to the peculiarities of 

 those in New Zealand. 



In order to facilitate the determination of the New 

 Zealand forms I have made an analytical table of the 

 genera ; but, as it is drawn up of course only from those 

 forms known to me, little reliance should be placed in it, 

 as such tables are only really trustworthy when the com- 

 ponents of a fauna are exhaustively known. 



(Anterior coxse extending to the front of the pro- 

 sternum . . . . . . . . . . . . Phelerosus. 

 Anterior coxte not extending to the front of the 

 prosternum . . . . . . . . . . 2. 



2 j Basal joint of hind foot shorter than the 2nd joint 3. 

 (Basal joint of hind foot longer than the 2nd joint 4. 

 Maxillary palpi elongate, as long as or longer than 



3. ■ the head Philydrus. 



Maxillary palpi shorter than the head . . . . 5. 



IMesosternum armed in the middle with an erect 

 i:)rocess . . . . , . . . . . . . 6. 



Mesosternum unarmed . . , . . . . . 7. 



2nd joint of hind foot at least twice as long as the 



1st 8. 



2nd joint of hind foot only slightly longer than the 



1st 9, 



■ Joint of antenna i^receding club developed trans- 

 versely in adaptation to the succeeding joint 10. 

 Joint of antenna preceding club simple . . . . 11. 



[Elytra with serial punctures; length of body, 



1 8 mm. . . . . . . . . . . . . Hydrohius. 



1 Elytra with only diffuse punctuation ; length of 



( body, 2 mm. . . . . . . . . . . Paracymus. 



, , f Hind tarsi compressed, not pilose beneath . . Tormus. 



(Hind tarsi not comin-essed, densely pilose beneath Hydrostygnus, 

 /^Hind claws short, with very short basal lobe . . Saphydrus. 

 7. \ Hind claws longer, with lobe beneath extending 



( half the length . . Rygmodus. 



Q J Antennfc 9-jointed ; middle cox£b much separated Adolopm. 

 (Antennfe 8-jointed ; middle cox£e less separated . . Cyloma. 

 /"Basal joint of hind foot only a little longer than 



^ I following Cyclouotum. 



' "1 Basal joint of hind foot more than twice as long as 



( following Cercyon, 



10 



