ELM BOKEKS. 227 



4. Thk six-eanded dryobius. 

 Dryobius sex-fasciatus Say. 

 Order Coleoptera; family Cerambycid^. 



A similar but larger grub than that of Saperda tridenfata, 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 obliqne 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 opaculus Leconte. 



Order Coleoptera ; family Scolytid^. 



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. Win. 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. Uminaris 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. (Riley.) 



I'lG. 72 a-d. — Tim dark cliu baikboier. — After Rilej'. 



The bceile. — Stout, op'aiiue, when mature of a uniform piceous-black color. Head 

 puuctulate, not narrow in front, without transverse impressions in front of the eyes. 

 Epistoma (Fig. 72b) truncate or very slightly and broadly emarginate. Labrum 

 visible. Antenual 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 stri.-B (Fig 72d) evidently impressed and 

 regularly, coarsely punctate ; interstices very distinct, each with a regular row of 

 small tubercles, which become more acute toward the apex and the sides. Pubescence 

 very coarse and short. Tibije (Fig. 72e) hardly dentate. (Riley's Rep. Ent. Dep. 

 Ag. 1879, p. 45. The other figures illustrate H. trifolii.) 



* See also Mr. Schwarz'a note in Proc. Ent. Soc. Wash., i, 149. 



