1878. ] 549 [Horn. 
Declivity of elytra with simple punctures....... -......cribratus. 
Declivity granulate or muricate....... eerste Dar DOD OF densus. 
Elytral punctures in regular striz. Color ferruginous....pusillus. 
Declivity more or less flattened and acutely margined. 
Second joint of antenne as slender as the third, joints 3-8 hairy in 
front. Marginal ridge of declivity short.......-. oGuAae punctatus. 
Second joint of antenne stout, joints 3-8 not hairy. Declivity flat 
and very abrupt, the marginal ridge long...... SB oo couisqubaler laity 
B. Antenne 11-jointed, form short. 
Margin of thorax not serrate, declivity convex............. ..- brevis. 
D. porcatus Lec. New Species, 1866, p. 101. 
Brownish opaque, sparsely clothed with short erect hair. Front opaque, 
roughly granulate. Thorax as long as wide, slightly narrowed in front, 
margin conspicuously serrate ; disc in front with spiniform tubercles, pos- 
teriorly moderately densely tuberculate and with a fine smooth median 
line: Elytra striately tuberculate. Body beneath sparsely punctate. 
Length .14 inch; 3.5 mm. 
Occurs from Pennsylvania southward and westward. 
D. substriatus Payk. (Apate) Faun. Suec. III, p. 142; Mann. 
Bull. Mosce., 1853, III, p. 2383. 
Piceous, moderately shining, sparsely clothed with short erect hair. 
Front shining, sparsely granulate. Thorax as wide as long, a little nar- 
rowed in front ; disc anteriorly with spiniform tubercles, posteriorly densely 
granulate, median line not evident; margin conspicuously serrate. Ely- 
tra with rows of coarse, deep, closely placed punctures, intervals sub- 
muricate. Body beneath shining, sparsely punctate. Length .16-.18 
inch ; 4—4.5 mm. 
This and the preceding species are closely allied and differ only in 
sculpture. In the former the intervals are broken up into closely placed 
tubercles, in the latter the punctures of the intervals are more evident and 
the intervals are continuous, their summits being submuricate. 
Occurs particularly in the Northern States and Canada. 
D. cribratus Lec. New Species, 1866, p. 102. 
Piceous, shining, sparsely hairy. Head shining, sparsely granulate. 
Thorax as wide as long, scarcely narrowed in front, margin very feebly 
serrate ; disc in front with coarser tubercles, posteriorly, densely granulate, 
median line not distinct. Elytra with coarse, deep punctures, moderately, 
densely placed, feebly arranged in rows on the disc, confused at the sides, 
intervals not elevated. Body beneath sparsely punctate. Length .16 inch: 
4 mm. 
Occurs in the Middle States. 
D. densus Lec. loc. cit. 
Piceous, moderately shining, sparsely hairy. Front shining, sparsely 
granulate. Thorax as wide as long, margin very feebly serrate; disc 
in front roughly tuberculate, posteriorly densely granulate. Elytra densely 
