Platynin^ 103 



prominent eyes; impressions small, with fine oblique extension to 

 the anterior superciliary puncture; antennae black, fully half as 

 long as the body; prothorax over a fourth wider than long, the 

 parallel sides evenly arcuate and finely reflexed, a little more so at 

 base, the angles broadly rounded; base as wide as the feebly sinuate 

 apex; surface with some transverse striae, the anterior impression 

 linear and distinct, the stria fine, not quite entire; fovea discal, 

 short, linear, deeply impressed and smooth; elytra three-fifths longer 

 than wide, fully one-half wider than the prothorax, the arcuate 

 sides a little more rounded basally; apex gradually rounded, with 

 barely visible sinus; stria; fine, not deep, impunctate, the intervals 

 flat, the anterior puncture of the third subaxial, the two posterior 

 near the second stria; met-episterna one-half longer than wide; 

 male anterior tarsi only feebly dilated. Length (cf) 7.5 mm.; 

 width 2.8 mm. Kansas, — Knaus gemmeum n. sp. 



Elytra oblong, parallel, with more feebly arcuate sides; body broader in 

 form and rather less convex 5 



5 — Upper surface intense and uniform bright green throughout, shining, 

 the elytra but little less so in the female; under surface bright 

 greenish-black, the legs black; head two-thirds as wide as the 

 prothorax, with large and moderately prominent eyes, the im- 

 pressions parallel, irregular; antennae black, less than half as long 

 as the body; prothorax only a fourth wider than long, the parallel 

 sides evenly arcuate and distinctly and abruptly though not broadly 

 reflexed, the angles broadly rounded; base rather wider than the 

 distinctly sinuate apex; transverse rugulae distinct, well separated, 

 the impressions obsolete, the stria rather fine but deep; foveae 

 discal, very short, deeply impressed, faintly and sparsely punctu- 

 late; elytra three-fifths to one-half (9) longer than wide, two- 

 fifths wider than the prothorax; sides gradually rounding at base; 

 apex gradually but obtusely rounded, the sinus feeble though evi- 

 dent; striae fine, extremely minutely, closely punctulate, the intervals 

 flat (9 ), nearly so (cT), the scutellar long, well impressed; the three 

 dorsal punctures are not very fine and are all more or less axial 

 on the third interval; met-episterna fully twice as long as wide; 

 anterior rnale tarsi very distinctly dilated, smooth and black. 

 Length (cf' 9) 9.5-10.0 mm.; width 3.5-3.8 mm. Utah (Stock- 

 ton), Colorado (VVray), — Shantz, and Oregon (Clackamas Co.). 



viridissimum n. sp. 



Upper surface more or less diversified with metallic cupreous and green. .6 



6 — Prothorax btit slightly wider than long; Atlantic regions. Body 

 oblong-suboval, not very convex, highly polished throughout and 

 bright green above in both sexes, the discal part of the elytra bright 

 cupreous-red; under surface and legs shining, black; head rather 

 distinctly elongate, much narrower than the prothorax, with large 

 but only moderately prominent eyes; antennae black throughout, 

 scarcely half as long as the body; prothorax a fourth to fifth wider 

 than long, the parallel sides evenly arcuate, sharply but narrowly 

 reflexed, somewhat more widely so at the basal angles, which are 

 broadly rounded, the transverse rugulae faint; anterior impression 



