Ecological and Behavior Notes 67 



fly, and left us only a wing for identification. 



Papilio pliylenor Linn. [Ernst Schwarz]. Actually 

 feeding on human excrement by the roadside, September 

 9, 1916. 



Thyridopteryx ephemaeformis. During the past few 

 years, bag-worm cocoons have been taken from the fol- 

 lowing vegetation: maple, wild sunflower, white snake- 

 root {Erigeron canadensis) ^ horse-weed, elm tree, rag- 

 weed, sour-dock, pokeberry, iron-weed, elderberry, pep- 

 per-grass, cultivated rose-bush, wisteria vine, rose of 

 Sharon, tamarack, hop vine, iris, sycamore, willow, peach 

 and sweet clover. While they are for the most part found 

 on trees, yet the list shows that they feel at home on 

 almost any plant. In a region where the bag-worms were 

 plentiful, only three were found on a group of eight cedar 

 trees. It is easy to suspect that cedar is distasteful to 

 them. Notes were kept on the longevity of 20 males 

 which emerged in confinement : 18 lived 24 hours ; 1 lived 

 14 and 1 only 12 hours. On October 14, a jumping spider 

 was found devouring the c^ bagworm while he was ferti- 

 lizing the ? within the bag. 



One occasionally finds these bags nicely decorated with 

 seeds (as in PI. VII fig. 11) instead of the usual bits 

 of twig and leaves. 



Pyrgus tesselata Scud. [H. C. Dyar]. A day on the 

 highroad showed this butterfly in only one spot; about 

 a dozen were fluttering around some fresh horse-dung, 

 evidently refreshing themselves upon it This was on 

 October 19, 1920. 



Myriapods 



Scutigera forceps. [J. M. Aldrich]. Frequent obser- 

 vations have led me to conclude that this house centipede 

 is carnivorous and feeds chiefly at night. One night in 

 July one was seen clinging to the screen door devouring 

 a small moth. Another was surprised on the stone wall 

 of the cellar w^here it was eating a young spider, Zelotes 



