COLEOPTERA SCOLYTIDJE. 



121 



brown colour, and clothed with pale pubescence which might almost 

 distinguish the species. Length 2.J, to 3 J- mm. 



The other two species of this genus, which may be overlooked, are 

 D. alni (lig. 116) and D. coryli. The former is said to be found on 

 beech, and the latter on dead twigs of hazel and hornbeam, but both 

 rare, especially the latter. 



These two species are about the size and appearance of P. hidentatus. 



Genus Tomicus. 



The species of this genus are all feeders on coniferous trees, but 

 some of the species are rather rare. They all make peculiar mark- 

 ings, so much so, that in conse- 

 quence of the strongly marked pat- 

 terns the species have been termed 

 "typographers." 



Some of the species are poly- 

 gamous, and the 

 main galleries 

 can be traced 

 from the start- 

 ing - point or 

 breeding - cham- 

 ber (Rammel- 

 kammer). 



Fowler gives 

 five species as 

 British, but I 

 have only found 



one in Northumberland viz., T. acuminatus. It is perhaps the'first 

 record for the county, and I am obliged to Mr E. S. Bagnall for 

 identification. 



The principal generic characters are : antennae whip five-jointed ; 

 thorax large, with a wrinkled little lump in front and punctured be- 

 hind ; wing-covers at the point pressed and toothed. 



Fig. in;. Dryocretes 

 alni. (From Barbey.) 



Fk 



117. Tomicus sexrtentatns. (From 

 Barbey.) 



Tomicus sexdentatus (Born.) 

 This is a large handsome beetle (fig. 117), pitchy dark-brown colour, 



