Platynin^ 



35 



convex; ninth stria somewhat nearer the eighth than the margin; 

 met-episterna one-half longer than wide; anterior male tarsi only- 

 very moderately dilated, as usual in this group, black. Length (d^) 

 1 1.5 mm.; width 4.4 mm. California (Redwood Creek, Humboldt 

 Co.) tersus n. sp. 



Sides of the elytra more rounded but only very slightly more arcuate 

 basally than medially; upper surface more convex 12 



12 — Form rather ventricose, polished in both sexes and of a dark piceous- 

 brown color; head but slightly elongate, with broad neck, fully 

 three-fourths as wide as the prothorax, the anterior impressions 

 short and parallel; eyes moderate though rather prominent; an- 

 tenna fully half as long as the body, slender, pale red-brown, the 

 apices of the joints blackish, the basal joints blackish; prothorax 

 as long as wide, sometimes a little longer, the sides moderately 

 arcuate, well reflexed, gradually straight or just visibly sinuate 

 posteriorly, the angles obtuse but with rather sharply prominent 

 tips; base and apex equal, both strongly beaded; apical angles 

 bluntly rounded at tip; surface with the transverse rugulse very 

 faint, the anterior impression deep, the posterior virtually obsolete, 

 the smooth foveas deep, not extending quite to the middle; elytra 

 oblong-ovoidal, shorter than usual, not quite one-half longer than 

 wide and nearly twice as wide as the prothorax, widest somewhat 

 behind the middle, the apex rapidly obtuse, the sinus long and 

 shallow; striae smooth, sometimes feebly punctulate laterally, deeply 

 impressed; intervals convex; met-episterna as usual in this section: 

 legs long, the hind tarsi finely sulculate externally. Length (cf 9 ) 

 9.3-10.8 mm.; width 3.9-4.7 mm. Oregon (Clackamas Co.) and 

 California (Areata, Humboldt Co.). Sixteen specimens. 



arachnoides n. sp. 



Form less ventricose, convex, deep black, polished; head nearly as in the 

 preceding but with somewhat longer neck; antennae shorter, not 

 half as long as the body, the joints pale, with blackish apices but 

 shorter than in arachnoides, the four basal joints black with pale 

 tips; prothorax shorter, a little wider than long, the sides more 

 inflated and rounded anteriorly, oblique basally to the broadly and 

 obtusely prominent tips of the obtuse hind angles, resulting in a 

 very small but definite sinus adjoining the tips; base scarcely as 

 wide as the apex, obliquely arcuate at the sides, the prominent 

 apical angles blunt at tip; surface, foveae and refiexed margins 

 nearly as in arachnoides, but with the anterior impression feebler; 

 elytra more elongate and more evenly oblong-oval, widest at the 

 middle, fully one-half longer than wide, nearly four-fifths wider 

 than the prothorax, the apex not so abruptly obtuse, the tips more 

 narrowly rounded, the long oblique sinus very shallow; striae 

 smooth, less deeply impressed, the intervals convex but rather less 

 so than in the preceding; second anterior male tarsal joint ob- 

 triangular, one-half longer than wide, narrowed from apex to base, 

 smaller, narrower and less parallel than in arachnoides. Length (cT) 

 10.3 mm.; width 4.0 mm. California (Hydesville, Eel River 

 Valley, Humboldt Co.) similatus n. sp. 



