Platyxin.e 105 



Form narrower, smaller in size, very moderately convex, shining through- 

 out in both sexes, the female elytra faintly alutaceous, black, with 

 green-bronze lustre above, becoming greenish on the anterior part 

 of the head and sides of the pronotum and elytra; under surface 

 and legs black, with very faint greenish lustre; head three-fifths 

 as wide as the prothorax, slightly elongate, with prominent eyes; 

 antennae black, shorter than in suffiisnm, only slightly longer than 

 the head and prothorax, the latter smaller and less transverse, a 

 third wider than long, otherwise as in suffusiim, except that the 

 base is still more evidently wider than the apex and the basal angles 

 more definite, though obtuse and blunt; base much less obliquely 

 arcuate at the sides; elytra narrower, nearly three-fifths longer 

 than wide, two-fifths wider than the prothorax, somewhat less 

 obtusely rounded at apex, with very feeble and much shorter apical 

 sinus; striae still finer and with minute, close-set punctulation, im- 

 pressed, the fifth more broadly indented at apical fifth; intervals 

 feebly convex, more distinctly in the male, the punctures of the 

 third not quite so developed and less attached to the striae; met- 

 episterna not quite twice as long as wide; anterior male tarsi 

 moderately dilated, black as usual in this section. Length (cf 9 ) 

 8.4-9.4 mm.; width 3.3-3.6 mm. California (Truckee). Four 



examples, taken by the writer sierranum n. sp. 



A — Somewhat similar but broader, bright cupreous throughout above, 

 the elytra feebly alutaceous in the female; striae still finer and 

 very minutely, closely punctulate, not at all impressed; intervals 

 broader, perfectly fiat in the female; punctures of the third 

 subaxial, except the third, which is near the second stria; apical 

 sinus similar. Length ( 9 ) 9.0 mm.; width 3.75 mm. California 

 (Redwood Creek, Humboldt Co.). A single specimen, taken by 



the writer sequoiarum n. subsp. 



Form shorter, the size still smaller, the surface much flatter, oblong, 

 shining, the elytra not distinctly alutaceous in the female, black, 

 the entire upper surface bright cupreous-red, a little less intense and 

 more aeneous at the sides of the elytra; under surface shining, 

 greenish-black, the legs black; head evidently elongate, two-thirds 

 as wide as the prothorax, the eyes well developed though scarcely 

 at all prominent, the impressions short, feeble, parallel; antennae 

 black, almost half as long as the body; prothorax a third or less 

 wider than long, parallel, with evenly and not strongly arcuate 

 sides, which are rather finely reflexed though becoming broadly so 

 at base, the angles very obtuse, with broadly rounded tip ; base 

 as wide as the sinuate apex, oblique at the sides; apical angles only 

 narrowly blunt; anterior impression angularly lineate, distinct, 

 the stria fine; foveae oval, broadly impressed and nearly smooth, 

 remote from the sides but attaining the base; elytra parallel, short, 

 two-fifths longer than wide, two-fifths wider than the prothorax, 

 rapidly very obtuse at apex, the sinus long and distinct; sides 

 rather rapidly rounding at base, the striae very fine, smooth, not 

 punctulate; intervals flat or nearly so, the punctures of the third 

 small, the anterior at the third, the other two at the second, stria; 



