ELM BORERS. 
227 
4. The six-eanded dryobius. 
Dryobius sex-fasciatus Say. 
Order Coleoptera; family Cerambycid^e. 
A similar but larger grub thau that of Saperda tridentata, but found with it, pro- 
ducing a black beetle of nearly similar form, with the edge of the thorax yellow, and 
also its scutel, with four yellow equidistant oblique bands on its wing-covers, the 
last one situated at the tip. Length 0.70 inch. (Fitch.) It also occurs on the 
beech, according to C. G. Siewers. 
5. The dark elm bark-borer. 
Hylesinus opaculw Leconte. 
Order Coleoptera ; family Scolytid^e. 
Making small perforations like pinholes, appearing in the bark, especially of dis- 
eased elms, from which, in August and September, issues a minute cylindrical bark- 
beetle of a dark-brown color; its wing-covers with deeply impressed punctured fur- 
rows and short hairs ; its thorax also punctured. Length 0.10 or less. (Harris.) 
We have not observed this bark-borer, but Mr. Wm. L. Devereaux, 
of Clyde, N. Y., writes as follows regarding the true name of the beetle : 
I think Harris mistaken about the occurrence of P. Hmivaris on elm. It must have 
been H.opaculus ; at least I never have found Uminaris under or on the bark.* 
This is a stout pitchy-black timber-beetle, living under the dry bark 
of the elm and ash trees. (Eiley.) 
The dark elui bark-boier. — After Eilej-. 
The beetle. — Stout, opaque, when mature of a uniform piceous-black color. Head 
punctulate, not narrow in front, without transverse impressions in front of the eyes. 
Epistoma (Fig. 72b) truncate or very slightly and broadly emarginate. Labrum 
visible. Antennal club very large, oblong-oval, the first two joints shining and 
pubescent only at apex. Thorax wider than long, very densely punctate ; pubes- 
cence moderately thick and short. Elytral striae (Fig 72d) evidently impressed and 
regularly, coarsely punctate ; "interstices very distinct, each with a regular cow of 
small tubercles, which become more acute toward the apex and the sides. Pubescence 
very coarse and short. Tibise (Fig. 72e) hardly dentate. (Riley's Rep. Ent. Dep. 
Ag. 1879, p. 45. The other figures illustrate H. trifolii.) 
* See also Mr. Schwarz's note in Proc. Ent. Soc. Wash., i, 149. 
