no. 3649 LEPTOFERONIA — HACKER 15 



Pronotum. — Sides from sinuate to slightly arcuate in vicinity of 

 posterior setiferous punctures; hind angles from acute to subrec- 

 tangular; base usually weakly bisinuate, sometimes arcuate with 

 hind angles more prominent; basal transverse margin always complete; 

 single pair of curving longitudinal impressoins sharply impressed; 

 faintly microstrigulose. 



Elytron. — Humerus from edentate to weakly dentate; setiferous 

 punctures on eighth stria consisting of six in anterior, one interme- 

 diate, and eight in posterior series; two setae at posterior end of 

 seventh stria; faintly microstrigulose. 



Ventral surface. — No coarse punctures, or rarely with a few 

 faint sparse punctures or rugosity on mesepisternum. 



Sixth abdominal sternum of male (fig. 4). — Lobe on apical 

 margin "rolled back" forward, giving an emarginate appearance 

 when viewed ventrally; small impression on face on right side. 



Aedeagus (fig. 4). — Eight paramere with large inward-directed 

 lobe on basal portion; long lobe beneath distal portion; sinuate 

 distal portion cylindrical except at tip; median lobe with lobe present 

 on right side. 



Length of body. — 7.0 to 9.0 mm. 



Variation. — There are two characteristics that show clinal vari- 

 ation. Specimens of the northern form, from north of about Waldport, 

 Lincoln County, Oreg., have the sides of the pronotum slightly arcuate 

 or oblique before the hind angles and the elytral humeri are edentate. 

 In specimens of the southern form, from south of about Coos Bay, 

 Coos County, the sides of the proDotum are distinctly sinuate toward 

 the posterior pair of setiferous punctures, then subparallel or diverging 

 to the more prominent hind angles. The elytral humerus is dis- 

 tinctly, though not strongly, dentate. In the area between Coos 

 Bay and Waldport, specimens are intermediate in these two charac- 

 teristics. Since the changes in the two characteristics are gradual, 

 these three categories are arbitrary. There does not appear to be 

 geographical variation in any other character; the structure of the 

 aedeagus, including internal sac, appears to be constant. 



Holotype. — Male, UW! 



Type-locality. — Devil's Lake, Lincoln County, Oreg. 



Specimens examined. — 432. 



Distribution (fig. 34). — This species has been collected from 

 Netarts, Tillamook County, Oreg., south to two miles south of 

 Smith River, Del Norte County, Calif. In the north it occurs as 

 far east as the eastern slopes of the Coast Range. In the south it 

 is restricted probably to areas nearer the coast. It is often abundant 

 and has been found to the elevation of 3700 feet. 



