Platyxix.^ 113 



widest at about the middle but notably and gradually narrowing 

 anteriorly, evenly and moderately arcuate, broadly but not strongly 

 reflexed, barely at all more so at the basal angles, which are obtuse 

 and rounded, less evident than in melanarium but much more so 

 than in molestum; foveae large, broad, very feebly impressed, the 

 inner more lineate part feebly and obtusely impressed, the surface 

 latero-basally very feebly subrugulose; elytra one-half longer than 

 wide, one-half wider than the prothorax, parallel, with feebly arcu- 

 ate sides, which are rounded at base; apex rather rapidly rounding, 

 the sinus feeble; striae fine, not impressed, having very fine and not 

 very close-set punctulation; the striae become sensibly and rather 

 broadly impressed both basally and at apex; intervals flat, the 

 second and third punctures near the second stria; anterior male 

 tarsi narrowly dilated. Length (cf) 8.7 mm.; width 3.5 mm. 

 Wisconsin (Beaver Dam). Communicated by Mr. Leng. 



mordax n, sp. 



Body somewhat as in molestum but narrower and more parallel, notably 

 convex, highly polished and deep black throughout, the legs black; 

 head moderate, scarcely four-sevenths as wide as the prothorax, 

 slightly elongate, triangular, with large and moderately prominent 

 eyes; surface smooth, the anterior impressions rather long, obtuse; 

 antennae slender, deep black, not quite half as long as the body, 

 much shorter than in molestum; prothorax nearly as in the latter 

 and transversely oval but shorter, one-half wider than long, the 

 parallel sides strongly and evenly arcuate and widely reflexed, the 

 edge thickened and more elevated about the broadly rounded basal 

 angles; surface smooth, with a few transverse rugulae medially, 

 without distinct transverse impressions, with a few scattered punc- 

 tures near the basal angles and along the marginal reflexure; basal 

 foveae elongate-oval, moderately deep, remote from the sides; 

 elytra three-fifths longer than wide, barely a fourth wider than the 

 prothorax, the sides feebly arcuate, gradually rounding behind, 

 not very rapidly rounding at the humeri; striae moderate, rather 

 deep, closely micro-punctulate; intervals broadly convex; dorsal 

 foveae rather strong, impressed, all three adjoining the third stria; 

 anterior male tarsi with the first three joints very distinctly dilated. 

 Length (c/') g.2 mm.; width 3.7 mm. Washington State (Wilbur), 

 — J. A. Hyslop hyslopi n. sp. 



5 — Form, coloration and lustre somewhat as in melanarium, the head 

 two-thirds as wide as the prothorax, slightly elongate, the eyes 

 large though only moderately prominent, the impressions distinct, 

 oblique and finer behind; antennae nearly similar and slender, but 

 with the joints notably shorter; prothorax relatively smaller and 

 much less transverse, scarcely a fifth wider than long, the sides and 

 general structure similar, but with the base subequal to the apex 

 and the basal angles more obliterated and rounded; elytra less than 

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

 the parallel sides more arcuate, though rather rapidly rounding at 

 base, the apex nearly similar, but with the sinus feebler and scarcely 

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



