72 THE CANADIAN ENTOMOLOGIST 



second joint has lengthened in proportion to the first, so that the average 

 proportions are preserved, although the palpi are extremely long. In B. 

 sonorus the first joint is relatively short (about as long as in pratorum, 

 hypnorum, etc.), but it is nevertheless over 4^4 times as long as the 

 second. 



(7) It seems probable that the only oligotropic bumble-bees are those 

 with extremely long tongues, adapted to certain species of aconite. The 

 American species probably all visit miscellaneous flowers, and this must 

 be especially true of the Arctic species, which have nearly a monopoly (so 

 far as bees are concerned) of the flowers of their region. Thus, B. 

 Kincaidii is the only bee on the Pribiloff Islands, where brightly-coloured 

 flowers abound. 



NOTE ON PITYOPHTHORUS CONIPERDA, SCHWARZ. 



BY W. HAGUE HARRINGTON, OTTAWA. 



This species was described in the Proceedings of the Entomological 

 Society of Washington, Vol. III., p. 144, 1895, and the author stated: 

 " I offer herewith a description of this species, being solely tempted 

 thereto by the interest attached to its life-history ; for, as far as I am 

 aware, there is no other Scolytid known which normally develops within 

 the cones of pine trees." Possibly since that time a similar habit may 

 have been observed in regard to other members of the Scolytidai, but I 

 cannot recall any reference to such observations. The beetle in question 

 was first collected by me on May 24, 1884, and its capture was quite 

 accidental. Mr. Fletcher and myself had that day visited a grove of 

 white pines on the Gatineau, a few miles north of Ottawa, with the special 

 object of collecting the somewhat rare little butterfly, Thecla Niphon, of 

 which we succeeded in capturing several good specimens. Having 

 climbed up into one of the pine trees, to try and net a butterfly which 

 had settled up aloft, I noticed that the young buds at the tips of the 

 twigs were injured by some insect. Investigation showed that one of the 

 bark-boring beetles was at work, and a few specimens were collected. These 

 were determined for me as Dryocoetes affaber, and were referred to by me 

 under that name in notes on Canadian Rhyncophora in the Canadian 

 Entomologist, 1891, Vol. XXIII., p. 26. At Aylmer, Que., about eight 

 miles above the city, on the Ottawa River, on June 25, 1887, while seeking, 

 with my friend Fletcher, upon red pines for Podapiou gallicoia, we found 

 the shoots and cones seriously infested by a Scolytid, which appeared 



