38 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



Color of body. — Dark piceous. 



Head. — Eyes normally large and prominent; frontal impressions 

 shallow, subparallel; microreticulate. 



Pronotum. — Sides entirely arcuate before obtusely rounded hind 

 angles; posterior pair of setiferous punctures forward, similar to 

 inopinus; transverse basal impression incomplete; shallow inner 

 longitudinal impressions not reaching base of pronotum; outer pair 

 of impressions absent; partly microreticulate. 



Elytron. — Humerus very rounded; humeral tooth small, not acute; 

 scutellar stria and scutellar puncture present; eighth stria with six 

 punctures in anterior series, one intermediate, nine in posterior 

 series; three setae at posterior end of seventh stria; microreticulate. 



Ventral surface. — Coarse punctures on mesepisternum and 

 metepisternum ; a few punctures on proepisternum. 



Legs. — Hind trochanter blunt and about half the length of hind 

 femur; legs relatively slender compared to inopinus; setae present on 

 ventrolateral margins of last article of tarsus. 



Sixth abdominal sternum of male (fig. 21). — Unmodified except 

 occasionally a small impression on face in about middle. 



Aedeagus (fig. 21). — Right paramere short. Median lobe broad, 

 sides subparallel in ventral view; ventral surface and right side 

 meeting sharply; low carina present along right side of ventral surface; 

 tip shallow, blunt; no lightly sclerotized strip. Internal sac with 

 prominent sclerotized tooth. 



Length of body. — 9.0 to 11.5 mm. 



Types. — Pterostichus sphodrinus, MCZ; Monoferonia idahoanus, 

 USNM. 



Type-localities. — Pterostichus sphodrinus, "Nebraska," which 

 probably includes Idaho and Montana (see Hatch, 1936, p. 704); 

 Monoferonia idahoanus, Moscow Mountains, Idaho. 



Specimens examined. — 20. 



Distribution. — Southeastern British Columbia, southern Alberta, 

 northeastern Washington, northern Idaho, and probably north- 

 western Montana. 



Remarks. — Superficially, this species resembles the species in the 

 inopinus group. This is due to the rounded elytral humeri, rounded 

 pronotal hind angles, and the posterior pair of pronotal punctures 

 being forward. The aedeagus and other characteristics show no 

 similarity to those found in the inopinus group. Probably sphodrinus 

 should be placed in the subgenus Hypherpes. Casey's (1924, p. 78) ref- 

 erence to "osculans" actually was to specimens of sphodrinus. Darlington 

 (1931, p. 159) lists the original osculans as a synonym of Monoferonia 

 diligendus. 



