OAK-BORERS. 91 
30. Elaphidion atomarium (Drury). 
According to Mr. Schwarz, this species and E mucronatum bore in 
dry twigs of Quercus virens in Florida. (Riley in American Entomol- 
ogist, iii, 239.) 
Beetle.— Head brownish black, covered with snort yellowish-gray pile. Thorax 
dirty black, covered with yellow-gray pile ; cylindrical, and without any spines or 
eminences. Antennae dusky brown ; having a spine on each joint, except that next 
the head, and about the length of the insect. Scutellum very small. Elytra black, 
mottled with yellow-gray, being margined at the sides and suture and not reaching 
or covering the anus, each having two spines at the extremity. Abdomen and breast 
grayish brown, as are the legs, each of which is furnished with a spine at the tip of 
the tibiae. 
31. Elaphidion mucronatum (Say). 
This species was found in company with the preceding by Mr. Schwarz. 
Beetle. — Brown, with ashy hairs ; antennae three or four spined ; thighs mucronate ; 
«lytra bidentate ; body reddish brown, partially covered with short, prostrate cine- 
reous hairs, unequally distributed. Antennae longer than the body ; joints 3 to 6, 
ending in a spine ; scutellum white, with dense hair divided into two lobes ; elytra 
punctured ; the hairs so disposed as to give the surface an irregularly spotted appear- 
ance; tip bispinose; intermediate and posterior thighs bimucronate, the inner spine 
longest. Length seven- twentieths of an inch. (Say.) 
32. Acanthoderes 4-gibbus Say. 
In this longicorn, which according to Mr. Schwarz bores in the twigs, the scape ot 
the antennae becomes thicker towards the tip, and is shorter than the third joint; 
the prothorax is armed with dorsal tubercles, with a large lateral spine. The eyes 
are less coarsely granulated than in the other species. " Body dark brownish ; an- 
tennae hardly longer than the body, blackish ; head before sparingly punctured ; 
labrum dull honey-yellow ; thorax with distant punctures ; four tubercles nearly in 
a transverse line, and a longitudinal, elevated line; elytra quadrigibbous at base; 
inner gibbosity extended with a longitudinal elevated line ; numerous distant deep 
punctures; a dilated, waved ashen spot before the middle; a sutural series of alter- 
nate square small brown and cinereous spots nearly opposite ; tip emarginate ; thighs 
•clavate. Length less than three-fifths of an inch." (Say.) 
33. Leptura zebra Olivier. 
The larva and pupa inhabit the black oak. (Dr. Horn.) 
34. Tragidion fulvipenne Say. 
According to Riley, this longicorn bores in the oak. (Am. Ent.,iii, 239.) 
Beetle. — Body deep black, covered with dense black hair; antennae rather longer 
than the body, somewhat hairy ; palpi glabrous, deep reddish brown; thorax above, 
with four obsolete tubercles and an intermediate, abbreviated, glabrous, longitudinal 
line; a slightly prominent lateral spine; scutel hairy, black; elytra yellowish- ful- 
vous, covered with dense, very short prostrate hair ; four longitudinal slightly ele- 
vated lines. Length three-fifths inch. (Say.) 
