OAK BARK-BEETLES. 93 



37. Xyleborus fuscatus Eichhorn. 



Beetle. — Length, 1 to H lines. Ferruginous brown, or yellow, thinly clothed with 

 gray hair, with the same form and sculpture as X. monographus, but somewhat smaller, 

 and distinguished by the oblique declivity of the elytra being marked by only a 

 single, large, acute tubercle, while the suture itself is also distinctly elevated. (Le 

 Conte. ) 



38. Xyleborus retusicollis Zimmermanu. 



Beetle. — Length, 1 line. Rust-j^ellow ; front smooth, with a deep longitudinal 

 impression ; prothorax longer than wide, a little broader than the elytra, punctured 

 in front ; thinly pubescent and very deeply excavated ; the front margin rising into 

 an acute point ; behind nearly glabrous and smooth. Elytra short, punctured with- 

 out order, thinly pubescent, obliquely declivous behind, and somewhat impressed 

 along the suture. Maryland, found under oak-bark. (Le Conte.) 



39. Pityophthorua pnhipennis Lee. 



Order CoLEOPTERA ; Family Scolytid^. 



Mr. Ricksecker remarks conceriiiug the habits of this bark borer on 

 the Pacific coast: 



I have seen great swarms of Pityophthoriis pnhipennis Lee. in the branches of 

 newly felled live oaks, and have taken the same or an allied species from sticks of 

 oak that had previously been peeled for tan-bark. (Ent. Amer., i, 97.) 



Beetle. — Club of autenme distinctly aunulated and pubescent on both sides, not 

 fringed with long hair. Fore tibia; moderately serrate; fore tarsi with joints 1 to 3 

 stout, fifth longer than the others united. 



Male head deeply concave; edge of the concavity fringed with long silky hairs. 

 Female head shining, sparsely hairy, punctured with an interocular tubercle; the 

 longer hairs of the elytra ( which are finely punctulate) are arranged in rows. (Le Conte 

 and Horn.) 



40. Pityophthorns querciperda Schwarz. 



Mr. Schwarz has observed the habits of this Scolytid beetle, and also 

 described the beetle in the Proceedings of the Entomological Society of 

 Washington (i, 56), stating that it occurs from ISTew York to Florida. 

 On page 162 of the same Proceedings Mr. John D. Sherman records 

 finding some sixty or seventy specimens nnder the bark of a felled oak 

 tree at Peekskill, N. Y. 



The galleries, which are partly in the bark and partly in the outermost layer of 

 the wood, are the primary galleries — i. e., those made by the parent beetle — and ex- 

 hibited a feature hitherto not observed in any other Scolytid. The female beetle 

 bores straight through the bark ; then follows a very short gallery vertically down- 

 ward, and this is crossed immediately below the entrance hole by an extremely long 

 transverse gallery. The novelty consists in the short vertical gallery, which, evi- 

 dently, is constructed only for the purpose of enabling the beetle to turn around 

 without getting on the outside of the tree. The larval galleries, if there be any, are 

 not yet known. (Schwarz.) 



Beetle. — This new species belongs to Le Conte's grouj) B, and may be called Pityoph- 

 thorns querciperda. It is closely allied to P. minutissimus, with which it agrees in 

 size, f'irm, and coloration, but from which it differs in the sculpture and pubescence 

 of the elytra. In minutissimus the elytra are finely and rather indistinctly punctu- 

 late ; the pubescence is fine, very sparse or nearly absent on the basal portion of the 

 elytra and denser on the declivity, but always hair-like. In querciperda the elytra 

 are quite distinctly rugosely punctulate, and, therefore, less shining. The pubescence 



