NORTH AMERICAN COLEOPTERA. 27 



arcuate for two-thirds tlie length posteriorly, then rapidly convergent and 

 distinctly sinuate ; anterior angles rounded, posterior very broadly rounded ; 

 disk evenly convex, highly polished, rather distantly, evenly, and finely 

 punctured, punctures round, somewhat feebly impressed, interspaces gener- 

 ally two or three times the width of the punctures. Elytra at base as wide 

 as the protliorax ; sides rather strongly divergent posteriorly, slightly shorter 

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

 rather strongly emarginate behind ; sutiire about equal in length to the 

 pronotum ; sutural striae fine and close ; disk very feebly punctulate toward 

 the base, toward the apices it becomes almost absolutely impunctate, punctures 

 extremely feebly impressed, separated by twice their own widths. First four 

 abdominal segments equal in width to the contiguous elytra ; sides parallel 

 and slightly arcuate ; border strong ; surface very minutely rugulose, feebly 

 shining. Legs moderate, slightly paler ; first and fourth joints of the poste- 

 rior tarsi equal in length, first as long as the second and third together. 

 Prosternum rather strongly punctate in its anterior half. 



Male. — Fifth ventral segment scarcely modified ; sixth segment narrowly, 

 deeply, and triangularly incised at apex. 



Female. — Sixth segment rather acutely produced at apex. 



Length 1.0-1.2 mm. 



Columbus, Texas ; three specimens. 



The above description was drawn from the female, the male being 

 in very poor condition. 



The sexual characters are open to doubt, owing to the extreme 

 difficulty in seeing them, in a satisfactory manner, in the specimens 

 at hand. 



9. E. ainericanus Er. — Form moderately slender. Pubescence short, 

 fine, semi-erect, evenly distributed, rather abundant. Color throughout 

 dark rufo-piceous, antennae and legs very slightly paler. Head slightly 

 wider than long, rather large; eyes small; interocular surface evenly con- 

 vex, strongly punctate, punctures round, sub-variolate, separated by their 

 own widths near the antennae, somewhat more crowded along the middle ; 

 there is usually a very narrowly impunctate line ; supra-antennal tubercu- 

 lations distinct ; labrum feebly arcuate anteriorly ; teeth rather short and 

 robust; antennae robust, longer than the width' of protliorax, third joint 

 distinctly longer than the fourth, fourth and fifth equal, sixth abruptly 

 much shorter, scarcely longer than wide, seventh more robust, very slightly 

 longer than wide, eighth of equal thickness, globular, ninth transversely 

 oval, much wider than the eighth, tenth as wide as long, two-thirds thicker 

 than the ninth, eleventh as wide as the tenth, as long as the two preceding 

 together, very finely acuminate ; last joint of the maxillary palpi longer than 

 the first two together. Prothorax scarcely one-third broader than long, 

 scarcely wider than the head ; sides sub-parallel and very feebly arcuate for 

 two-thii-ds the length posteriorly, then rather rapidly convergent and very 

 feebly sinuate ; anterior angles rounded ; anterior margin much longer and 

 less arcuate than the posterior ; surface very strongly punctate, punctures 



