304 ENTOMOLOGICAL NEWS [Oct., 'l8 



form, finely truncate at tip, not subulate, and longer than the 

 preceding joint. 



Prothorax with side margin narrow and a seta at the sides 

 near the front and at hind angles. Body not pedunculate, 

 scutellum distinct. Elytra elliptical, not margined at base, 

 sides narrowly inflexed, margin posteriorly entire and without 

 internal plica, disc without distinct striae, but with five or six 

 well-marked dorsal punctures. Prosternum not prolonged at 

 tip. Mesosternum declivous in front and sulcate, moderately 

 separating the coxae, the epimera narrow. Metasternum short, 

 the epimera distinct, the posterior coxae narrowly separated. 

 Legs moderate in length, the tibiae not spinulose externally, the 

 anterior deeply emarginate within, the inner spur almost at 

 middle. Tarsi slender, claws simple. The anterior tarsi of 

 the males with two joints dilated and squamulose beneath. 

 Type of genus, Trechus barbarae Horn. 1 



This genus undoubtedly belongs in the tribe Pogonini, though 

 it differs from all genera included within that tribe by Horn 2 , 

 by having the posterior coxae separated. Of the two 

 groups composing that tribe, it superficially resembles most 

 the Trechi, especially the typical genus Trechus, within which 

 the type species was placed by its describer. It is, however, 

 structurally much more closely related to the genus Pogonus of 

 the group Pogoni, especially as regards its mouth parts. Its 

 habits also more closely simulate those of Pogonus. 



Thalassotrechus nigripennis n. sp. 



Elongate, subdepressed, moderately shining, rufotestaceous, abdomen 

 and outer joints of antennae somewhat piceous, elytra black excepting 

 narrow marginal bead and epipleurae. 



Antennae moderately stout, the ninth joint reaching the elytra, the 

 outer joints gradually broader. Head finely alutaceous, impunctate, 

 frontal depressions vague, eyes moderately prominent, mandibles promi- 

 nent and correct. 



1 "Random Studies in North American Coleoptera," by George H. 

 Horn, M. D., Trans. Am. Soc., Vol. XIX (1892), p. 4. 



2 "On the Genera of Carabidae with special reference to the fauna of 

 Boreal America," by George H. Horn, M.D., Trans. Am. Ent. Soc., 

 Vol. IX (1881-2), p. 135. 



