AMERICAN COLEOPTERA. 49 



very nearly so in mature specimens, the upper surface, more 

 especially of the elytra, with a more or less distinct violaceous 

 lustre, no trace of which is ever discernible in tristis. The 

 punctuation is notably coarser throughout, being especially 

 coarser, sparser and more unevenly distributed on the thoracic 

 disk. The prothorax is a trifle less transverse, the sides 

 plainly convergent from the base. The impressions within 

 the prothoracic angles are, as in tristis, rather feebly marked 

 at best, but in case of doubt on this point, the size and locality 

 label will always serve to identify these two species, atlantis 

 being the only other of similar size and appearance occurring 

 in the same region. 



Liberia occurs from Massachusetts to Georgia, but is appar- 

 ently very rarely taken to the west of the Appalachian Moun- 

 tain system. The localities represented before me are: Mas- 

 sachusetts (Tyngsboro) ; New York (Peekskill) ; New Jersey 

 (Anglesea, Sea Island City); Delaware; Maryland (Plummer's 

 Island); District of Columbia; Virginia (Ft. Monroe); North 

 Carolina (Southern Pines) ; Georgia (Thomasville) ; Kentucky. 

 The species is said to occur in Ontario, and Prof. Wickham 

 writes me that it is recorded from Ames on the Iowa list. 



36. D. subcostata Blanch. 



Moderately robust, the elytra sometimes subparallel, sometimes dis- 

 tinctly wider posteriorly, red brown to castaneous, shining. Mentum 

 moderately declivous from anterior third, declivity feebly or moderately 

 margined. Clypeal margin feebly sinuate at middle, the lateral angles 

 broadly rounded; clypeal suture distinctly impressed and nearly 

 straight. Front not appreciably more convex behind the clypeal 

 suture, frontal impressions feeble or obsolete; punctuation variable, 

 the punctures usually well separated. Prothorax less than twice as 

 wide as long, widest at base, sides more or less conspicuously bisinuate, 

 hind angles right or slightly acute, disk usually sparsely finely punc- 

 tate, but rather variable. Elytra one-third longer than wide, discal 

 costas inconspicuous, not or scarcely more convex; intercostae rather 

 sparsely irregularly punctate, punctuation moderately coarse with a 

 slight tendency to rugosity in some specimens, usually evident only 

 in certain lights. Pygidium with median longitudinal impressed line. 

 Body beneath finely sparsely punctate at middle, more closely at sides. 

 Prosternum bicarinate at middle. Upper tooth of front tibia nearer 

 the base than to the apex; hind thighs stout, sparsely finely punctate 



TRANS. AM. ENT. SOC, XXXV. (7) MARCH, 1909. 



