THE CANADIAN ENTOMOLOGIST. 163 



As I believe it to be unfair to anticipate knowingly a communication 

 which is near its publication, I would only give a short notice of some 

 facts which may perhaps serve Prof. Riley in bringing to the front, at least 

 for the cases observed by me, the connection of pear-blight with this 

 beetle. The twigs were attacked about two feet above their origin out of 

 the trunk, where they are about two inches thick, and higher up to half 

 an inch thickness. The next year, if the dead branch is not removed, the 

 beetle goes further down. The craddle is perpendicular in most cases, 

 except where it begins just below the base of a bud, and is about an inch 

 long. The galleries are to four inches long, and rather deeply injuring 

 the sap-wood. The hole for the pupa goes deeply, to 4 miUim., in the 

 wood. I have observed the beetle only in pear trees, but I possess it 

 from Europe on Prtpuis domestica. 



I know Mr. F. J. Burrill's papers in Proc. A. Ass. 1880, p. 583, and 

 Amer. Nat. 1881, vol. xv., p. 527. I failed in trying to repeat his obser- 

 vations, what I consider of no importance against Mr. Burrill's conclu- 

 sions, as just such observations need a trained skill not at my command. 

 But I know that other scientists perfectly trained for such observations 

 have also failed. As bacteria are everywhere to be found, we will have to 

 wait for other reaffirming observations before we are able to accept Mr. 

 Burrill's views. I should add that I am acquainted with the older litera- 

 ture on pear-blight, and with the different hypotheses about its causes. 



HISTORY OF THE PREPARATORY STAGES OF PHYCIODES 



PICTA, Edw. 



BY W. H. EDWARDS, COALBURGH, W. VA. 



EGG. — Sub-conic, truncated, the top convex, the upper part from one 

 fourth to one third the length marked by low vertical ribs, about 24 in 

 number ; below these the surface is shallowly and irregularly indented ; top 

 similarly indented, convex \ color when laid yellow green. Duration of 

 this stage about five days. • 



YOUNG LARVA. — Length .04 inch at 12 hours from egg, cylindri- 

 cal, each segment a little rounded ; color yellow-green ; a few long black 

 hairs spring from minute black tubercles ; these are in longitudinal rows, 

 two being dorsal, and two sub-dorsal (one on either side) ; these rows run 



