COLEOPTERA. 9 



1. D. nitidlllus Lee. — Pubescence fine, sub-recurnbent, sparse, very 



inconspicuous. Head rather large ; interocular surface raised slightly above 

 the eyes, with two very deeply impressed, broadly rounded, longitudinal 

 impressions dividing it equally; intermediate surface strongly and evenly 

 convex; punctures tine, evenly distributed, distant at all points by slightly 

 more than their own widths, interspaces Hat ; eyes rather small, prominent; 

 genae long, continuous in curvature with the eye ; antennae three-fourths 

 longer than the width of head, black, rather slender, club dark fuscous ; 

 third joint one-half longer than the fourth, fourth and fifth equal in length, 

 each joint enlarged toward its tip ; maxillary palpi long and slender, piceous- 

 black throughout. Prothorax arcuately, rapidly, and evenly increasing in 

 width to the middle, where it is slightly narrower than long ; sides thence 

 feebly convergent posteriorly, at first sinuate ; basal angles broadly rounded ; 

 anterior and posterior margins equal in length and curvature, feebly arcuate ; 

 surface transversely and feebly impressed just behind the apex, strongly 

 tuberculate near each basal angle ; finely, distantly, and evenly punctate, 

 interspaces flat, shining, minutely reticulated. Elytra at base just visibly 

 narrower than the head ; sides feebly divergent posteriorly, about equal in 

 length to width at base, nearly straight ; suture about one-fifth longer than 

 the pronotum; surface feebly impressed on the suture toward the base, 

 coarsely, sparsely, and nearly evenly punctured : punctures rounded, gene- 

 rally distant by more than twice their own widths, interspaces shining, 

 nearly flat ; flavate spot beginning slightly before the middle of each elytron, 

 extending as an oval posteriorly and outwardly. Border of abdominal seg- 

 ments very strong. Legs long and slender, black, pubescence fulvous; first 

 joint of the posterior tarsi distinctly longer than the next two together. 



Male. — Posterior edge of the fourth ventral segment just visibly emarginate 

 in its middle two-fifths, contiguous surface feebly flattened; fifth segment 

 emarginate in its middle two- fifths at apex, emargination nearly evenly 

 rounded, about ten times as wide as deep, contiguous surface strongly 

 flattened throughout; sixth segment deeply and broadly sinuate at apex, 

 sinus evenly rounded, slightly more than twice as wide as deep ; seventh 

 segment transversely truncate at tip, lateral spines very strongly developed. 



Female. — Sixth segment somewhat angularly produced at tip. 



Length 4.5 mm. 



White Mts., New Hampshire, 8 : Garland, Colorado, 10. 



The commonest of our species of this genus ; when its localities 

 are found, it seems to be numerous, but these are very seldom dis- 

 covered. 



The head in this species is smaller than in zephyrus. 



2. D. clsalyl>eus Lee. — Form robust. Pubescence very fine, sub-recum- 

 bent, rather close, dark piceous-brown, inconspicuous. Head large; inter- 

 ocular surface having two longitudinal, broadly rounded, and deep impres- 

 sions ; intermediate surface strongly and very evenly convex ; punctures 

 very fine and close, evenly distributed over the entire surface, rather feebly 

 impressed, generally separated by their own widths : eyes narrow ; antennae 



