124 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



that it would appear to be now by no means an uncommon 

 insect. 



The generic characters are given as follows from Fowler r 

 (i) eyes entire or slightly emarginate ; (2) antennae with the 

 sutures of the club distinctly marked, the club itself being 

 somewhat variable in shape; (3) thorax tuberculate in front, 

 margined at base; (4) scutellum small punctiform ; (5) elytra 

 not exca.vate at apex, clothed with a scale-like pubescence and 

 sometimes, in addition, with fine raised hairs. 



Fowler's description of the species is given as follows : — 



C. abietis, Ratz. Oblong, subcylindrical, compressed and very 

 convex : fuscous or fuscous-brown, dull, antennas and legs 

 reddish-brown, club of the former usually darker, rounded at 

 apex : thorax subglobular, very finely punctured at sides and 

 behind, front part confusedly granulate : elytra rather more 

 than double as long as thorax with distinct punctured interstices, 

 covered throughout with extremely short scale-like hairs, and 

 also very diffusely with short erect hairs which are wanting 

 behind : the colour of the antennae and the legs is somewhat 

 variable : the species may easily be recognised by the tubercles 

 on the anterior portion of the thorax being few in number and 

 irregular in their distribution, and by the regular comparatively 

 strong rows of punctures and very short pubesence of the elytra. 

 Length 1 to 2f mm. 



The investigator's own examinations of the species lead him 

 to emphasise the following points : — 



(1) Club of antennae rounded at apex, antennal funicle 

 four-jointed. 



(2) Tubercles on prothorax irregular in distribution (not in 

 concentric circles) and wide apart. 



(3) Elytra covered with very short scale-like hairs, their inter- 

 stices with a diffuse row of short erect hairs, which are absent 

 on the apical parts. 



From the measurement of a large number of specimens of 

 various origin, he finds the average length to be 175 mm. 



Detailed descriptions, with numerous illustrations, are given 

 of the egg, and the structure of the larva and imago. These 

 are of considerable importance, especially to the student working 

 on Scolytidae. 



The forester in his daily work pays great heed to the galleries 

 of bark beetles, and in many cases is guided by their appearance 



