98 EHYNCHOniOKA— SCOLYTIDAE. 



tured striae, interstices smooth, strongly and broadly im- 

 pressed along suture, with three strong, toothlikeprominences 

 (placed longitudinally, parallel with suture) on each side. 

 L. I — ^ 1. Scarce. P. chalcographus, Lin. 



6. Thorax punctured rather closely and strongly behind. 



I, Elytra of male with upper tooth at apical impres- 

 sion large and lower tooth small ; elytra of female 

 with a tubercle above furrow at apex. 



Usually lighter or darker brown, often with head and 

 thorax black. Thorax narrowed in front, fore part closely 

 granulate, hinder part rather closely punctured, with smooth 

 and somewhat raised central line ; elytra with fine punctured 

 striae, their apex in male impressed, with a large, hooked 

 tooth at commencement of impression and above this 

 usually a small prominence, in female with only suture 

 raised and a narrow furrow near it on each side. L. 1 1. 

 Common. P. hidens, Fab. 



II, Elytra of male with upper tooth at apical im- 

 pression not large and lower tooth not small ; elytra 

 of female with a tubercle placed at end of furrow at 

 apex. 



Black, shiny ; antennae rust-red ; legs brown. Thorax 

 strongly punctured behind, with a narrow, somewhat raised 

 central line and a round lateral spot impunctate. Elytra 

 with fewer and shorter hairs than P. hidens, disc with liner 

 rows of punctures, the apical impression in male obtusely 

 bordered beneath, not fringed with hair, tooth on upper part 

 feebler, lower one more distinct, tubercle at apex of elytra 

 of female placed lower. L. 1 1. Eare. 



P. quadridens, Nord. 



Dryocaetes, 



A* Thorax evenly punctured throughout. 



a. Sides of thorax somewhat rounded ; length 2 lines. 



Oblong, shiny. Brown. Similar to D. villosus but with 

 thorax shorter and broader, disc less closely punctured, 

 apex of elytra less abruptly retuse, sutural stria less defined, 

 teeth on tibiae feebler and placed more closely, first joint of 

 club of antennae longer. Bare. D. autographus, Eatz. 



&. Sides of thorax nearly parallel ; length 1| lines. 



Oblong, shiny. Lighter or darker brown, covered with 



