NORTH AMERICAN COLEOPTERA. 25 



fifth equal, sixth and seventh slightly shorter and equal, eighth glohular, 

 ninth very slightly wider than long, slightly longer than the eighth, tenth 

 as long as wide, one-half wider than the ninth, sides nearly straight, eleventh 

 longer than the two preceding together ; maxillai-y palpi very long and well 

 developed, Prothorax widest slightly behind the middle, where it is scarcely 

 more than one-third wider than long ; sides thence very feebly convergent 

 and evenly arcuate anteriorly, merging gradually into the very broadly 

 rounded anterior angles, much more strongly convergent and distinctly 

 sinuate posteriorly ; anterior margin distinctly longer than the isosterior, 

 equally arcuate ; surface evenly convex, very highly polished, strongly 

 punctured, punctures rather variolate, round, separated by from once to three 

 times their own widths, much coarser and deeper in a line along the base, 

 and in two longitudinal lines, extending from the base to the middle, and 

 dividing the pronotum laterally into three equal parts. Elytra at base as 

 wide as the pronotum ; sides rather strongly divergent posteriorly, distinctly 

 shorter than the width at base, evenly and strongly arcuate ; together broadly, 

 roundly, and moderately emarginate behind ; suture slightly shorter than 

 the pronotum ; disk slightly depressed along the suture, feebly, coarsely, 

 and evenly punctulate, punctures round, very feebly impressed, and sepa- 

 rated by slightly more than their own widths ; surface highly polished near 

 the base and exteriorly, excessively minutely granulose and not polished in 

 the neighborhood of the inner apical angles ; in this granulated area the 

 punctures become almost obsolete ; sutural striae very deep. First two 

 abdominal segments slightly broader than the contiguous elytra; surface 

 scarcely shining ; border very strong. Legs moderately long ; first joint of 

 posterior tarsi equal in length to the next two together, and slightly shorter 

 than the last. 



Male. — Fifth ventral segment emarginate in^ts middle twelfth at apex, 

 emargination evenly rounded, and about six times as wide as deep ; sixth 

 segment very narrowly and deeply sinuate at apex, sinus two and one-half 

 times as deep as wide. 



Female. — Unknown. 



Length 1.4 mm. 



Cambridge, Mass. ; one specimen. 



A very distinct species. The extremely minute granulation of the 

 elytra near the inner apical angles appears to be quite a common 

 character in the genus, and it is undoubtedly the cause of the irides- 

 cence seen in iripennis, although in other species it does not have 

 that effect. 



In the above-described male, the third and fourth ventral segments 

 are just perceptibly emarginate in the middle at apex, and the sur- 

 faces of the third, fourth, and tilth segments appear to be very feebly 

 flattened in the middle. 



7. E. iripennis n. sp. — Form somewhat slender. Pubescence long, 

 fine, sparse, sub-recumbent. Color of head and pronotum dark reddish- 

 testaceous, of the elytra castaneous, of the abdomen paler reddish-testace- 



