W. Ritchie 



173 



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

 centric circles) and wide apart. 



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

 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 

 orioin I find the average length to be 1-75 mm. 



I 



F. 



5. 



I 



Fig. 2. Antenna of Cryphalus abietis Ratz. Posterior face of club is shown 

 on the right (both greatly magnified). C =club; F. =funicle; S. = scape. 



SEXUAL DIFFERENTIATION IN C. ABIETIS. 

 There are no reliable external difierentiating sex-characters although 

 sometimes the female is slightly larger than the male. 



Owing to the close resemblance in feeding habits, similar size, and 

 external naked eye appearance of C. abietis and C. jpiceae, these two 

 species may be readily confused. 



I have compared by aid of the binocular microscope my C. abietis 

 with C. piceae from Central Europe in Dr Stewart MacDougall's collection 

 and give in tabular form the outstanding differences between the two 

 beetles. 



C. abietis 



Tubercles on prothorax irregular in their 

 distribution (not in concentric circles) and 

 wider apart. 



Sides and posterior margin of prothorax 

 bear no marked grejash-white hairs. 



Interstices' of elytra covered through- 

 out with scale-like hairs, and each has a 

 row of dififuse short erect greyish-white 

 hairs which are absent on the apical parts. 



Ann. Biol, v 



C. jnceae 



Tubercles on prothorax fairly regular 

 in their distribution (in concentric circles) 

 and closer together. 



Sides and posterior margin of prothorax 

 bear long raised greyish-white hairs. 



Interstices of elytra covered with a 

 few scale-hke hairs and each has a row of 

 long, raised, greyish -white hairs, which 

 are most marked on the lateral margins 

 and apical portions of the elytra. 



12 



