94 BULLETIN" 14 5, UNITED STATES NATIONAL MUSEUM 



Male. — Form of irmsculinus Horn, and moderately shining; an- 

 tennae and head green, the latter aeneo-cupreous on the occiput; 

 pronotum bronzy brown, with the sides slightly more greenish; 

 elytra piceous, with a feeble aeneous tinge; beneath black, with a 

 feeble aeneous or greenish reflection, and slightly more shining than 

 above. 



Head with the front wide, slightly convex, and about equal in 

 width at top and bottom, the lateral margins vaguely, arcuately 

 expanded at vertex, and with an obsolete, longitudinal, median de- 

 pression; surface coarsely, sparsely punctate, finely, densely granu- 

 lose, more or less rugose behind the epistoma, feebly, longitudinally 

 rugose on the occiput, and rather densely clothed on lower half with 

 moderately long, semierect,- white pubescence, which does not conceal 

 the surface ; epistoma strongly transverse between the antennae, and 

 rather deeply, arcuately emarginate in front; antennae extending to 

 middle of pronotum, serrate from the fourth joint, and the outer 

 joints as wide as long ; eyes large, broadly oblong, and about equally 

 rounded above and beneath. 



Pronotum three-sevenths wider than long, base and apex about 

 equal in width, and widest just behind the middle; sides obliquely 

 expanded from apical angles to behind middle, where they are feebly, 

 obtusely angulated, then obliquely narrowed to the posterior angles, 

 which are rectangular; when viewed from the side the marginal 

 carina is slightly sinuate, the submarginal carina nearly straight, the 

 two carinae rather widely separated at apical fourth, and connected 

 to each other near the base; anterior margin strongly sinuate, with 

 a broadly rounded median lobe; base transversely bisinuate, the 

 median lobe scarcely produced, and feebly emarginate in front of 

 scutellum; disk moderately convex, with two broad, indistinct de- 

 pressions arranged longitudinally at middle, a deep, broad depression 

 along lateral margin extending from apical fourth to base, and with 

 sharply defined, straight, prehumeral carinae, extending from base 

 to basal third; surface coarsely, densely, transversely rugose, finely, 

 densely granulose, and with numerous fine punctures between the 

 rugae. Scutellum strongly, transversely carinate, and the surface 

 densely reticulate. 



Elytra wider than pronotum at base, and about equal in width at 

 base and apical third; sides parallel for a short distance behind 

 base, broadly, arcuately constricted in front of middle, broadly 

 rounded at apical third, then obliquely narrowed to the tips, which 

 are separately, rather broadly rounded, and ,feebly, irregularly 

 serrulate; sides of abdomen not visible from above; disk feebly 

 convex, sutural margins elevated posteriorly, with broad, moderately 

 deep basal depressions, and without distinct costae; surface densely 

 imbricate-punctate. 



