POGONIISLE 411 



ferent in elytral and antennal structure, it becomes highly probable 

 that no one of the three can be rubens. Micans of LeConte, from 

 Lake Superior, I have not seen; it probably belongs in the same sec- 

 tion as the three just mentioned, but the expressions in regard to 

 the prothorax "utrinque ante medium foveolatus" and to the ely- 

 ,tra "maculis utrinque duabus magnis obscuris valde obsoletis" 

 are not applicable to any of them; the former of these expressions 

 is possibly either a mistake or refers to some abnormal condition 

 in the type specimen. 



There can be no doubt that calif ornicus is distinct from chalybeus; 

 it is a smaller and narrower species, as shown by the ample series 

 at hand, besides differing in color as stated by Motschulsky. The 

 species described by LeConte under the preoccupied name fulvus 

 is also amply isolated. Carolina is the most remarkable of our 

 species in its extremely inflated and convex hind body, narrow head, 

 small eyes, very long filiform antennae and sharply prominent hind 

 thoracic angles, in which last character it is however approached 

 by arizoncz. 



Anatrechus n. gen. 



This remarkable genus is founded upon Trechus barbarce of Horn. 

 It differs from Trechus in the much larger head, stouter palpi, the 

 last joint being much longer than the third and conoidal, in the 

 obsolete frontal sulci, basally much narrowed prothorax, with the 

 sides of the base very oblique, recalling Platidius, and in the obso- 

 lete basal foveae, absence of elytral striation and of the subscutellar 

 puncture or tubercle; also in the lack of any trace of the peculiar 

 arcuate apical fossa in prolongation of the fifth stria distinguishing 

 Trechus; it further differs by the presence, along the median line 

 of each elytron, of several coarse setigerous -punctures, disposed 

 apparently in two approximate series. On the under surface it 

 differs greatly in the small and very short met-episterna and rela- 

 tively longer abdomen and the male, instead of having the first 

 two joints of the anterior tarsi strongly dilated, has these tarsi 

 thicker, the first two joints more transverse and less conspicuously 

 dilated when compared with the two following joints. The eyes 

 are well developed and rather prominent, the mentum tooth acutely 

 bidentate and the hind tarsi thick, the basal joint as long as the 



