AMERICAN COLEOPTERA. 113 



Anterior tarsi of male with four joints feebly dilated and densely spongy 

 pubescent beneath. 



NoTiOPHiLUS. — Labrum moderately prominent arcuate in front. 

 Mandibles stout not prominent, acute at tip. Maxillae feebly ciliate 

 internally the palpi moderate the terminal joint but little longer than the 

 preceding. Mentum moderately deeply emarginate, the tooth notched, 

 ligula prominent, the tip slightly prolonged and bisetose, paraglossae 

 slender, arcuate, longer than it, the palpi with last two joints nearly 

 equal, the penultimate bisetose in front. The first three joints of the 

 anterior tarsi are feebly dilated and spongy pubescent beneath. 



Nebria. — Labrum truncate or feebly emarginate. Mandibles acute 

 at tip, not concave externally. Maxillae ciliate at base, the palpi slender 

 the terminal joint a little longer than the preceding. Mentum deeply 

 emarginate with a bifid tooth, lig-ula not prominent the tip truncate or 

 slightly prolonged and bisetose, the paraglossae usually adherent in their 

 entire extent, sometimes slightly free at tip, the palpi moderate, the 

 penultimate joint bisetose in front. The anterior tarsi of the males have 

 three joints feebly dilated and pubescent beneath. 



Pelophila. — Characters nearly as in Nebria with the last joint of 

 the palpi more oval. First three joints of anterior tarsi of male rather 

 broadly dilated and densely pubescent beneath. 



The above characters seem to show the danger of attaching too great 

 value to characters drawn from the ligula and paraglossae as a basis for 

 the arrangement of the genera of Carabidje. 



In Notiophihis the anterior tibiae are very obliquely truncate the 

 inner spur above the apex. In the other genera both spurs are terminal 

 but placed slightly obli((uely to each other. 



The genera which occur in our fauna Ijclonging to this tribe are 

 as follows : 

 Front deflexed, head with two supra-orbital setse, spurs of anterior tibire terminal. 



Elytra with oeellate fovese, not margined at base Opistllius. 



Front horizontal, head with one supra-orbital seta. Elytra margined at base. 



Anterior tibise very obliquely truncate, the inner spur above the apex. Vertex 

 sulcate Notiophilns. 



Anterior tibife scarcely obliquely truncate, spurs terminal. 



Mandibles explanate at the sides, maxillse at base with spine-bearing pro- 

 cesses L.eistus. 



Mandibles stout, not explanate, maxillse not appendiculate and merely setose 

 at base. 



Anterior tarsi of male feebly dilated Nebria. 



Anterior tarsi of male broadly dilated Pelophila. 



In addition to the peculiarities already mentioned it might be observed 

 that while all the genera above mentioned (except Nofiophilus), place 



TItANS. AM. ENT. SOC. IX. (24) AUGUST, 1881. 



