DRYOCAETES. 99 



long, pale liairs. Thorax very closely punctured, elytra 

 with strong punctured striae and a row of fine punctures 

 on each interstice, apex somewhat retuse, sutural stria deep 

 behind. Common. D. villosus, Fab. 



S, Thorax granulate throughout. 



Black ; elytra black-brown or brown, shiny ; antennae 

 and legs yellow-brown. Thorax dull, closely covered with 

 transverse, scalelike granules ; elytra with rows of strong 

 punctures, sutural stria deep, interstices with a row of much 

 more diffusely placed fine punctures, l^arrower than I). 

 hicolor and less hairy, thorax without obsolete transverse 

 depression behind middle and elytra much less distinctly 

 flattened at apex. L. 1 — 1\ 1. Eare. D. alni, Georg. 



C, Thorax granulate in front, punctured behind. 



a. Hinder part of thorax diffusely punctured, with im- 

 punctate central line ; body brown-red. 



Narrow, cylindrical, shiny. Brown-red, thorax lighter in 

 front ; antennae and legs red-yellow ; pubescence gray. 

 Tliorax half as long again as broad, closely granulate in 

 front, diffusely and finely punctured behind, middle ini- 

 punctate, sides straight or scarcely sinuate ; elytra obliquely 

 flattened at apex, with rows of strong punctures, impressed 

 near suture behind. L. | — 1 1. Eare. D. coryli, Per. 



b. Hinder part of thorax closely punctured, without 

 impunctate central line ; body pitch-black or brown. 



Pitch-black or brown, with long whitish-gray hairs ; 

 antennae and legs pale yellow-brown. Front half of 

 thorax strongly but not closely granulate, hinder part 

 closely punctured ; apical declivity of elytra forming a 

 round, finely punctured surface (almost sharply defined at 

 sides), with a narrow, shallow furrow near the somewhat 

 raised suture. L. f 1. Scarce. I), hicolor, Herbst. 



Xyleborus. public library, 



A, Elytra together as broad or nearly as broad as long. 



Short. Pitch-black ; antennae and legs reddish-yellow- 

 brown. Front of thorax closely granulate, hinder part 

 finely punctured ; elytra with punctured striae, interstices 

 broad, with a row of much finer punctures, in male almost 

 globular, broader than thorax, together as broad as long, in 



B 2 



