1878. ] 575 (Horn. 
A. tuberculatum Lec. New Species, 1863, p. 67. 
Elongate, sub-cylindrical, pale brownish, moderately shining, apical half 
of the elytra piceous. Thorax longer than wide, sides very feebly arcuate 
near the apex and base, hind angles very obtuse, apex without thickened 
margin but with two rather distant erect tubercles <~, or simple 2, disc 
with the sub-marginal and lateral carinze, median lines almost entirely ob- 
literated, anterior tubercles moderate <j or wanting ©, surface sparsely 
punctulate. Elytra not wider than the prothorax, at base with nearly ob- 
solete rows of punctures, intervals more finely punctulate. Body beneath 
and legs very sparsely punctulate, pale rufous. Length .18-.20 inch; 4.5- 
5 min. 
The humeral angles of the elytra are not dentiform. The head is as in 
parallelopipedum. This should be compared wtih A. bicolor of Europe. 
Occurs in Georgia and Virginia. 
A. ferrugineum Zimm. Trans. Am. Ent. Soc. 1869, p. 254. 
Elongate, cylindrical, pale brownish, ferruginous, shining. Head punc- 
tulate, vertex not tuberculate. Thorax longer than wide, sides nearly 
straight, hind angles obtuse, apical margin not thickened, disc with the 
sub-marginal and lateral carinze well developed, median impressed lines 
rather deep, converging in front, anterior tubercles obsolete, surface mod- 
erately punctate. Elytra not wider than the thorax, humeri not dentiform, 
surface finely punctulate with a very faint tendency to a striate arrange- 
ment near the base. Body beneath sparsely punctate. Prothorax more 
densely and coarsely. Length .14 inch; 3.5 mm. 
This species is our smallest and most cylindrical. It differs from all the 
others in the absence of the tubercles of the vertex and is the only species 
in which the two lines at the middle of the disc are really well marked. 
Occurs in Georgia and South Carolina. 
COLYDIUM Fab. 
Antenne arising under the side of the head, eleven-jointed, last three 
forming a rather loose club, antennal grooves wanting. Anterior cox 
moderately distant, posterior separated by a triangular acute inter-coxal 
process. Tibi slightly broader at tip, not denticulate at outer angle, each 
with two short terminal spurs; tarsi with the first joint moderately long, 
fourth not longer than the others together, clothed beneath with moderate 
hair. Abdominal segments gradually shorter. Form slender, elongate. 
C. lineola Say, Journ. Acad V, p. 264; Entomology, ed. Lec. II, p. 
324; nigripenne Lec. New Species, 1863, p. 67. 
Slender, cylindrical, elongate, piceous, moderately shining. Head mod- 
erately punctured. Thorax longer than wide, slightly narrower poste- 
riorly, hind angles obtuse, sub-marginal stria very close to the lateral mar: 
gin, another stria one-fifth from the same, a deeper median impressed line, 
surface moderately coarsely punctured. Elytra not wider than the thorax, 
