206 BULLETIN 108, UN"ITED STATES NATIONAL MUSEUM. 



1919. Thompson, C. B., and Snyder, T. E. The question of the phyiogenetic origin 

 of the termite castes. Biological Bulletin, Woods Hole, Mass., vol. 36, No. 2, 

 pp. 115-132, Feb. (Discusses phylogeny, morphology, and the breeding and 

 progeny of the three different reproductive forms.) 



1919. S.\FFORD, W. E. Natural History of Paradise Key. Ann. Kept. Smithsonian 

 Institution for 1917, pp. 377-434. (Describes fauna and flora of Royal Palm 

 Hammock.) 



1919. Thompson, C. B. The Development of the Castes of Nine Genera and Thir- 

 teen Species of Termites. Biol. Bull., vol. 36, no. 6, pp. 379-398, June. 



