Platynin^ 8 1 



elytra have the striae coarse, sometimes throughout, but generally 

 more distinctly so and more punctate basally; in quadrulum they 

 are more abbreviated than in any other Platynid which I have 

 seen, being but little longer than wide. The three species are 

 described below; 



Elytra very short, scarcely more than a fourth longer than wide; color 

 black, the upper surface with the feeblest subviridate lustre. Body 

 short, moderately convex; under surface shining, deep black; legs 

 testaceous, the femora black; head slightly elongate, three-fourths 

 as wide as the prothorax, the eyes well developed and prominent; 

 impressions short, outwardly oblique posteriorly; palpi slender, 

 black, with pale tip, the last joint slightly longer than the third; 

 antennae slender and long, piceous throughout, nearly three-fourths 

 as long as the body, the third and fourth joints equal; prothorax a 

 fifth wider than long, widest just before the middle, the sides rather 

 inflated, rounded, straight and oblique basally, very finely reflexed, 

 rather broadly so at base, where they form the outer wall of the 

 foveae; basal angles obtuse and distinctly rounded; base as wide 

 as the very moderately sinuate apex, the apical angles distinct; 

 surface punctured throughout the width basally, the transverse 

 impressions obsolescent, the stria deeply impressed, extending from 

 apex to the punctured area; foveae large, deep, rounded; elytra 

 four-fifths wider than the prothorax, parallel, rapidly obtuse behind, 

 the humeri rather rapidly rounded, the sinus long, feeble; striae 

 fine, impunctate and grooved posteriori}^ gradually coarse, deep 

 and coarsely punctate from the middle to the base; intervals nearly 

 flat behind, rather convex basally; scutellar stria coarse, deep and 

 punctate; dorsal punctures three, accidentally four on the left 

 elytron of the type; met-episterna elongate, the tarsi slender. 

 Length (9) 6.7 mm.; width 2.7 mm. Illinois, — Webster. 



quadrulum n. sp. 



Elytra less abbreviated; upper surface polished, aeneo-viridate, the 

 elytra subcupreous; under surface an& legs as in the preceding. . . .2 



2 — Body rather more convex than in the preceding and much more 

 elongate; head slightly elongate, three-fourths as wide as the 

 prothorax, the eyes well developed but not very prominent; im- 

 pressions deep, parallel; antennae slender, piceous, pale basally, 

 not as long as in quadrulum or soliduluni, though more than half 

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

 widest near the middle, with rounded sides, becoming oblique and 

 feebly sinuate basally, the angles obtuse but distinct, scarcely at 

 all rounded as a rule, the margins reflexed as in the preceding, the 

 stria similar but not so impressed, the anterior impression evident 

 medially; basal parts less closely punctate, the large deep rounded 

 foveae similar; elytra two-fifths to nearly half longer than wide, 

 not quite twice as wide as the prothorax, especially in the male, 

 gradually rounded behind, with very feeble sinus and finely reflexed 

 margins as usual; striae coarse, deep and coarsely punctate anteriad, 

 T. L. Casey, Mem. Col. IX, Jan. 1920. 



