226 MEMOIRS ON THE COLEOPTERA 



elytra with fine impunctate striae, the scutellar obsolete; body ob- 

 long, small in size Leironotus 



7 Prothorax decidedly wider before the base somewhat as in the preced- 

 ing genera 8 



Prothorax widest at base as a rule, though sometimes very feebly inflated 

 and in such cases slightly wider submedially than at base 9 



8 Posterior male tibiae not pubescent within; body stout, oblong. 



Leiocnemis 



Posterior male tibiae pubescent within; mentum tooth truncate and trap- 

 ezoidal to bilobed; body slender to stout; thoracic sides sinuate to 

 rounded basally as in Curtonotus Bradytus 



9 Posterior male tibiae without internal pubescence 10 



Posterior male tibiae pubescent within 1 1 



10 Prosternal process having numerous bristling setae; body larger. 



Percosia 



Prosternal process without more than two setae; body smaller, often with 

 thinner integument Celia 



ii Body elongate-oval, always with dense integument Amara 



12 Body as in Amara, though usually smaller or relatively narrower 

 and more elongate, the male tibiae as in that genus Triaena 



Two of the species hitherto placed in Curtonotus, differ so greatly 

 from typical forms of the latter as seemingly to warrant generic 

 separation under the names above suggested for Curtonotus pteros- 

 tichinus or putzeysi and hcematopus. The characters given for 

 Leironotus Gangl., are taken from the work of Mr. Hayward, as 

 I have no representative of the species Amara arenaria at hand, 

 and therefore can consider it no further for the present. I have 

 also omitted Acrodon Zimm., for similar reasons; it is founded upon 

 A. brunnea Gyll., of northern Europe, said to occur also in Alaska; 

 a species from Colorado in my collection, which may have been 

 confounded with it, has a trapezoidal sinuato-truncate mentum 

 tooth; it is said to be acute in Acrodon brunneum. The form of 

 the mentum tooth varies a good deal in nearly all the groups of 

 Amarinse and is an uncertain element in the estimation* of genera. 

 In Curtonotus, for example, it is normally small, short and bilobed, 

 but in fulvipes and carinatus it is short, very broadly trapezoidal 

 and with truncate apex; so also in Bradytus, we have the usually 

 bilobed form, or the trapezoidal and narrowly truncate develop- 

 ment seen in apricarius. 



Feronalius n. gen. 



The species named pterostichimis by Hayward, forming the type 

 of this genus, and of which a male from Fort Wingate, New Mexico, 



