136 MEMOIRS ON THE COLEOPTERA 



spicuous strial punctures, less obliterated lateral striae and still 

 more vestigial scutellar stria, more slender tarsi and in general 

 habitus to an appreciable extent. 



Abacidus Lee. 



The very peculiar habitus of this group probably warrants the 

 retention of the name Abacidus Lee., but Peristethus Lee., should be 

 regarded as synonymous. The characters given by LeConte for 

 the separation of groups D and E of Pterostichus (Bull. Bk., 1882, 

 p. 17) are repeated frequently in true Pterostichus and therefore 

 should not be regarded as generic in this case. Fallax Dej., of 

 which a pair was sent me by Mr. Manee, collected in North Caro- 

 lina, is the type of Abacidus and a very strongly differentiated 

 species, as is also hamiltoni Horn. I do not seem to have a single 

 example of sculptus, which is said to be common in the South. The 

 following is either a distinct species or a very remarkable modifica- 

 tion of permundus; I feel disposed to adopt the former hypothesis 

 at least provisionally : 



Abacidus planifer n. sp. Oblong-oval, feebly convex, the elytra 

 broadly flattened medially, deep shining black throughout; head as in 

 permundus; prothorax also as in that species, except that the outer 

 impression is more oblique and that the entire surface is covered with a 

 system of feeble transverse wavy lines, as in many California species of 

 the planctus group; punctures on the deplanate side margins fine and 

 sparse; elytra subequal in width to the prothorax, as in permundiis, 

 except that the striae are completely impunctate and the intervals through- 

 out perfectly flat; groove of the first hind tarsal joint fine, barely glimps- 

 able and subob^olete; abdomen punctured and rugulose laterally; pro- 

 sternal process margined behind as in permundus. Length (9) 15- 

 mm.; width 5.8 mm. Indiana. 



The peculiar transverse wavy lines of the pronotum and the per- 

 fectly flat strial intervals, are the principal distinguishing features 

 of this form, but I cannot judge of the constancy of these characters, 

 having only a single example at hand. 



Poecilus Bon. 



Luctiblandus group. 



The variations in form, color, convexity and lustre of the strial 

 intervals, number of dorsal foveae and size, among the numerous 

 representatives of lucublandus Say, from various parts of the coun- 



