94 PINE. 



discrimination between the two kinds, lineatum and quercus. And 

 perhaps I should add that, perceiving the difficulties of perfectly 

 certain determination, I submitted my specimens to examination of 

 Mr. 0. E. Janson, F.E.S., who verified my identification as correct. 



The communications with which I was favoured by Mr. J. R. 

 Eobertson, from the Chatsworth Estate, of which the first was sent 

 me on Jane 28th, were as follows : — 



" I have been considerably troubled for the last few weeks by the 

 damage being done to some Oak timber that has been felled for about 

 eighteen months by larvae that I think belong to the Scolytiis or 

 Bostrichiis type. . . . The damage is considerable, the timber 

 being quite riddled with small holes to a depth of two or three inches. 

 The holes look as if they had been made with a small gimlet, and a 

 tiny heap of small fine sawdust left at the outside of each. I am send- 

 ing you by this post a box containing the larvfe m sitxi." — (J. R. R.) 



About a week later — that is, on July 5th — Mr. Robertson com- 

 municated with me again, mentioning that he now observed beetle 

 infestation of a similar nature in some felled Larch timber lying close 

 to the Oak which he first noticed as attacked, and forwarded me speci- 

 mens of pupae, and also of the fully-developed beetles. 



These beetles were in very active condition, and corresponded well 

 with the description of the Pine-boring kind, T. lineatum. They are 

 very small, only about a quarter to a third of an inch in length, and 

 of the shape figured at p. 92 — that is, somewhat straight-sided and 

 cylindrical. The thorax punctured and black (customarily), dull 

 yellow-brown towards the hinder margin ; the wing-cases dull yellow- 

 brown, with a black stripe running along each at the suture, the outer 

 margin, and characteristically also along the middle ; but in some 

 cases this line or stripe is partly absent. In my specimens it was 

 represented by some marks towards the base of the elytra. The 

 wing-cases are also marked with rows of punctures. The legs are 

 dull yellow-brown, as also the antennae, which are terminated by a 

 rounded club. 



This species is liable to differences in colouring, and three varieties 

 are noted by Eichhofi", of which the most distinct has the whole body 

 pale brownish yellow, with a blackish head, and fore edge of the 

 thorax (" Halsschild ") and the breast duller. 



With regard to the kinds of trees infested by this species, it is 

 observed : — " These beetles, which live exclusively in needle-leaved 

 trees [Conifer a,), are distributed over almost all Europe, and are 

 also .... to be found in North America. Amongst different kinds of 

 Conifers {Pinus si/lvestris, Abies excelsa dudpectinata, and Larix europoia) 

 they appear, where they have the opportunity, to especially select the 

 Silver Fir (Weisstanne). What Ratzburg and Altum, and to some 



