238 THE KNTOMOLOGIST 



again. This change I anxiously watched; and on the 1 4th 

 insl, I had the pleasure of observing the most wondeiCul 

 transformation in the appearance of a larva that 1 have ever 

 witnessed. It is now veritably A. alni. It has lost all traces 

 of dirty white markings ; its ground colour is a beautiful 

 black, and the usual conspicuous yellow markings are very 

 striking, being uniform throughout, while the long clubbed 

 hairs on each segment give it somewhat the appearance of a 

 centipede. My larva is now (August 16th) feeding well upon 

 birch. In 1874 I found a larva o{ A. alni in the New Forest, 

 which produced a fine imago the following year; but it was 

 full fed at the lime that I found it, and I could not tempt it 

 to eat. — J. Platt Barrett; 34, Radnor Street, Peckham. 



AcRONYOTA ALNI. — I captured a larva of this species at 

 Seven Oaks, on the 12th inst. — T. Lovell; August, 1877. 



DoRYPHORA DECEMLINEATA. — I have had much practical 

 acquaintance with the Colorado potato-bug in Canada, where 

 every year it appears on my farms. I do not consider there 

 is any need for panic in this country, even if it does become 

 a colonist. I have successfully caused its almost total 

 suppression each year on my land by the liberal use of Paris 

 green (arsenite of copper), although every season it reappears 

 in equal numbers. Two applications of a solution of this 

 chemical poison has always been, in my experience, effectual. 

 1 have it applied wet now, although I once tried it as a dry 

 powder when the dew was on the haulm ; but this was very 

 dangerous, causing illness to the workmen who inhaled the 

 powder as it blew about with the wind. 1 quite disagree with 

 the savants of the British Association and others who consider 

 this climate too humid for its development, especially during 

 hibernation. In Canada 1 have dug them out of the mud, 

 which was knee deep, in the spring of the year. This was in 

 low ground, and before tlie higher tabJe-land was thawed out. 

 I have even kept them as an experiment in water; but when 

 taken out and placed in the sunshine they soon revived, 

 seemingly none the worse. Once, while on a visit at Chicago, 

 1 saw them crawling on the docks in countless numbers : the 

 water had been covered with them for weeks. 1 took some 

 of these apparently lifeless insects out of the dock and put 

 them where the sun shone on them, when they shortly 

 crawled away. In Canada, generally, comparatively little 

 damage has been done by the beetle, ou account of careful 



