Ecological and Behavior Notes 39 



rence of this sort shows that their behavior is not bound 

 by iron-clad instincts. On August 21, 1916, I found a 

 number of these bees going through a sort of courtship 

 dance on a sandbar in Fox Creek, near Allenton, Mo. All 

 of the specimens taken were males. 



Megachile mendica Cress. [J. C. Crawford]. A nest 

 of ten cups made of bits of green leaves was dug out of a 

 rotten log at Creve Coeur Lake. Eight adults emerged 

 between July 1 and 5, 1916. An adult was taken on a 

 black-eyed susan flower at Cliff Cave, October 19, 1920. 



Megachile sp. In an old stem was found the dainty 

 two-celled nest of an unknown species of Megachile. The 

 cells were made of discs cut from the leaves and yellow 

 petals of wild mimosa. On April 10, 1919, the parasite 

 Coelioxys near sayi and octerentati [T. D. A. Cockerell] 

 emerged. 



Megachile hrevis Say. [S. A. Rohwer]. In a sumac 

 stem taken at Cliff Cave on April 21, 1920, a beautiful 

 nest of this little bee was found. The tunnel was about 

 two inches deep, and this was completely filled with the 

 nest made of yellow petals. During the last week of May, 

 five perfect adults emerged. PI. V fig. 4, shows the nests 

 or cells made from portions of leaves in hollow stems by 

 Megachile bees. 



Osmia near pumila Cress. [T. D. A. Cockerell]. Sev- 

 eral bees were found dead in their cocoons which were cut 

 out of a sumac twig on November 11, 1919. 



Heriades carinatus Cress. [J. C. Crawford]. Three 

 individuals of this species emerged from sumac twigs on 

 August 4 and 5, 1916. These twigs had been taken at 

 Eureka, Mo., on July 12. Two emerged on August 11 

 and 25 from twigs taken at Meramec Highlands, and a 

 dead specimen was taken from a hollow twig on July 6, 

 1918. The tunnel in that case was three-sixteenths inch 

 in diameter and four inches long, and in the bottom was 

 a half-pellet of bee-bread. It would be interesting to 

 know whether or not the nest and provisions were her 



