18 



[1900 



Dr. J. Stewart MacDougall, Entomologist to the Highland and Agri- 

 cultural Society of Scotland, together with specimens of larvae and 

 pupre, and some observations, from which, with his permission, I 

 extract the following notes : — 



" On May 12th, 1898, I received some pieces of Ash stem, which, 

 on examination, showed themselves to be infested with H. crenatus 



E.C.K. 



Piece of Ash bark, showing mother-galleries and also larval galleries of Hrjlesinus 

 crenatus in the inner side. 



larvfe. In the first week of July imagines began to issue. On July 12th, 

 1898, I took a piece of thick barked Ash that had been lying cut for 

 some time, but was still fairly fresh, as tested by cutting away a little 

 of the bark. This piece of stem, measuring eighteen inches long by 

 nine inches in diameter, I placed in a large cotton bag, and introduced 

 some live newly issued H. crenatua. 



" On examining this early in August, bore-holes and bore-dust gave 

 promise of a successful experiment. 



" Examination of the log on July 9th, 1899, revealed a flight-hole, 

 evidently newly bored, and on dissecting away the bark I found a 

 number of pupae, and several large larvae evidently about to pupate." — 

 (J. S. MacD.) 



The larvae, of which Dr. MacDougall sent me a plentiful supply 

 from his collections during the past summer, varied from rather over 

 one-eighth to three-eighths of an inch in length, and were (as figured, 

 p. 19, much magnified) cylindrical, legless; segments somewhat largest 

 behind the head, those succeeding deeply and numerously furrowed 

 across above ; markings less noticeable below ; head much smaller 

 than the following segment, smooth, and chestnut colour in the 



