LAWS OF INTERNAL CHANGE 119 



SIMPSON, C. T. 



1899. The Pearly Fresh-water Mussels of the United States ; 

 ' their Habits, Enemies, and Diseases ; with Sugges- 



tions for their Protection. U. S. Fish Comm. Bull, 

 for 1898, Vol. XVIH, pp. 279-288. 



SLADEN, F. W. L. 



1912. The Humble-Bee, its Life-History and how to Domesti- 

 cate it. pp. 283. London. 



A very valuable account of the British species, with 

 numerous suggestions on methods of studying them. 



SMALLWOOD, M. E. 



1903. The Beach Flea : Talorchestia longicornis. Cold 



Spring Harbor Monogr. I. pp. 27. 



1905. The Salt-Marsh Amphipod : Orchestia palustris. Cold 



Spring Harbor Monogr. III. pp. 21. 

 Both of these papers discuss habits and life histories. 

 SMITH, B. G. 



1907. The Life History and Habits of Cryptobranchus Alle- 



gheniensis. Biol. Bull., Vol. XIII, pp. 5-39. 

 Contains references to other salamanders. 

 STOCKARD, C. R. 



1908. Habits, Reactions, and Mating Instincts of the "Walk- 



ing Stick," Aplopus Mayeri. Carnegie Inst. Pub. 

 No. 103, pp. 43-59. 

 TOWER, W. L. 



1906. Habits and Instincts in Leptinotarsa. pp. 229-257. 



In An Investigation of Evolution in Chrysomelid 

 Beetles of the Genus Leptinotarsa, Carnegie Inst. 

 Pub. No. 8. Washington, D.C. 



TUTT, J. W. 



1897. The Drinking Habits of Butterflies and Moths. Proc. 

 South London Ent. and Nat. Hist. Soc., 1897, pp. 

 [1-9]. 



VOIGT, W. 



1904. tJber die Wanderungen der Strudelwiirmer in unseren 



