4 MEMOIRS ON THE COLEOPTERA 



cally than the possession of subulate palpi, in connection with a 

 Tachys-\ike habitus, and I would therefore suggest that Micratopus 

 form a tribal division of the Bembidiinae, all the other genera above 

 denned together forming another tribe.* 



Tachypus Dej. 



In the most recent European catalogue this genus is given the 

 name Asaphidion Gozis, but I leave it here under the name by which 

 it will be recognized universally. The only reference to the genus 

 as occurring in America to be recalled at present, is the description 

 of Tachypus elongatus by Motschulsky (Kaf. Russ., p. 16, note 5), 

 redescribed by Mannerheim (Bull. Mosc., 1853, III, p. 146). It 

 was said to be from the Island of Sitka, Alaska, by Motschulsky, 

 but with a note of interrogation; so Tacliypus may not be truly 

 established in North America at all. The original type was lent 

 to Mannerheim for description. The prothorax is said to be longer 

 than wide, cordate and canaliculate; it is much shorter than wide 

 in both caraboides and flavipes of the European fauna. 



Bembidion Latr. 



This unwieldy genus is essentially northern in distribution, while 

 Tachys and allied genera are also abundant in tropical regions. It 

 is well represented however in our Sonoran faunas, but compara- 

 tively rare in our southeastern maritime states, and when occurring 

 there the species are nearly always peculiarly isolated, as for in- 

 stance in the case of fraternum Lee., a species wholly unknown to 

 me at present. 



The grouping of the species given below is in the main similar to 

 that proposed by LeConte and Hay ward, but I have been obliged 

 to modify their conclusions in a number of cases. For instance 

 the species allied closely to honestum Say, do not belong at all with 

 bifossulatum Lee., but are to be referred to the ustulatum group, 

 constituting a part of the subgenus Peryphus. Then I have made 

 a distinct group of erasum Lee., including a large number of species, 



* Since the original description of Micratopus was published, I have observed in 

 the type species a regular series of short erect setae along the entire length of each of 

 the strial intervals, but only visible under a particular angle of illumination and there- 

 fore overlooked. These setae arise from punctures so very minute and feeble as to be 

 barely traceable under considerable amplification. 



I 



