282 
Psyche 
[December 
10. 1918. 
11. 1920. 
12. 1922. 
13. 1922. 
14. 1922. 
15. 1924. 
Proterandry and flight of bees. Ent. News 
29 : 340-2. 
Lutz, F. E. and Cockerell, T. D. A. Distribution 
and bibliography of N. A. Apidae etc. Bull. 
Am. Mus. Nat. Hist. 42 : 490-641. 
Robertson, C. Data of anthecology. Flowers and 
insects. XXI. Bot. Gaz. 73: 149-52. 
Synopsis of Panurgidae. Psyche 29 : 159-73. 
Frison, T. H. Notes on life history etc. of Antho- 
phora abrupta. Tr. Am. Ent. Soc. 48: 137-56. 
Robertson, C. Color preference of bees. Flowers 
and insects. XXIII. Bot. Gaz. 78: 68-84. 
