200 WASP STUDIES AFIELD 



44), and in each cell a hopper bearing an egg in precisely 

 the same position as before. One of these eggs hatched 

 two days later, September 17; by the next day it was de- 

 veloping rapidly. The other egg was probably injured by 

 the crowding of too many hoppers in a small tin box. Two 

 of the hoppers died three days later, and one died after six 

 days. The larva which hatched devoured its food speedily, 

 leaving only the hardest parts of legs and integument, and 

 it grew with astonishing rapidity. Just nine days after 

 the discovery of the egg, the larva began to spin. It made 

 a small area of brown silken carpet under itself, but had 

 difficulty in forming a cocoon in the small tin box, which 

 was quite different from its natural earthen cell. We tried 

 to shape a little nest of cotton around it on which it might 

 get a hold, but it could not adapt itself to its strange sur- 

 roundings and died in the attempt at cocoon-making. 



Although we had learned by this time just what to look 

 for, we succeeded in finding only one more of these nests, 

 during the summer of 1915. The characteristics of this nest 

 and its surroundings were in every way identical with those 

 just described. It was discovered only four days later than 

 the others, and the larva on one of the hoppers appeared 

 to be about a day old. 



Another season's observations were unsuccessful in clear- 

 ing up the mystery of the maker of these nests, so we give 

 forth this meager record which really is no more than to 

 make known the fact that there is a ground-digger, prob- 

 ably a wasp, which makes horizontal twin cells and stores 

 them with one locust each. 



Chlorion cyaneum Dahlb. [S. A. Rohwer]. 



We hereby enter our protest against Chlorion cyaneum: 

 we spent over fifty hours during one summer intently 



