PSYCHE. 



ORGAN OF THE CAMBRIDGE ENTOMOLOGICAL CLUB. 



EDITED BY B. PICKMAN MANN. 



Vol. I.] Cambridge, Mass., June, 1874. [Xo. 2. 



Notes on the Habits of Magdalinus armicollis Say. 



Early in April, 1873, the full-grown larvse of Magdalinus 

 armicollis Say, were found abundantly throughout Cambridge, 

 Mass., under the bark of Elm. The burrows were about an 

 inch and a half long, running generally with the grain, and 

 in the cambium layer throughout their entire length. From 

 the cell at the end an exit pierced the bark as far as the thin 

 outer layer. The beetles usually attacked the upper branches, 

 but several small elms were found with the bark of the trunk 

 undermined nearly to the ground. Occasional specimens were 

 found associated with Saperda tridentata and Synchroa 'punc- 

 tata in the thick bark of full-grown trunks, l 



By the middle of April the larvee showed signs of trans- 

 forming ; J)y the end of the month most of them had com- 

 pleted the change into pupa, and the imagos appeared in 

 about eighteen days. From May 1st to May 18th the follow- 

 ing changes took place : 



1. The eyes and mandibles turned black, and the extrem- 

 ities of the wing-pads became bluish. 



2. The thorax became reddish-brown, and the snout very 

 dark brown or red. 



3. The pupa-skin was cast off, and the wings and elytra 

 straightened out. 



4. The wings were folded under the elytra, and began to 

 darken, showing a rectangular spot through each elytron. 



5. The thorax darkened on the sides in two oval patches, 

 leaving a line between, which gradually faded out; the spots 

 on the elytra spread uniformly over their surfaces, leaving 

 only their tips, which with the head were the last to become 

 black. 



The jet-black imagos emerged in great numbers from May 



