vi University of Michigan 



Xo. 13. Case, K. C. — On a Nearly Complete Skull of Symbos caiifroiis 

 Leidy from Michigan. (2 plates.) 



Xo. 14.— Riithven, Alexander G. — Observations on the Habits, Eggs, 

 and Young of Ilyla fiiliriiiaiiiii Peracca. (i plate.) 



X'o. 15. Walker, Bryant. — A List of Shells Collected in Arizona, X'ew 

 Mexico, Texas and Oklahoma by Dr. E. C. Case. 



Xo. 16. Ruthven, Alexander G. — Description of a X^ew Subspecies of 

 Cnemidophorus leniiiiscatus Laurenti. (i plate.) 



X'o. I". Gaige, Helen Thompson. — The Amphibians and Reptiles Col- 

 lected by the Bryant Walker Expedition to Schoolcraft County. 

 Michigan. 



X'o. 18. Thompson, Crystal. — The Reptiles and Amphibians of Man- 

 istee County, Michigan. 



X'o. 19. Ruthven, Alexander G. — Description of a X'ew Genus and 

 Species of Lizard of the Family Gekkonidae. 



X'o. 20. Ruthven, Alexander G. — Description of a X^ew Tailless Am- 

 phibian of the Family Dendrobatidae. 



Xo. 21. Ruthven, Alexander G. — A Xew Genus and Species of Lizard 

 from Colombia, with Remarks on the Genus Pseudogonatodes. 



No. 22. Ruthven, Alexander G. — Description of a X'ew Genus and 

 Species of lizard from British Guiana. 



Xo. 23. Cockerell, T. D. A. — Bees from the Xorthern Peninsula of 

 Michigan. 



Xo. 24. Cockerell, T. D. A. — Some Bees from British Guiana. 



Xo. 25. Gaige, Frederick M. — The Formicidae of the Shiras expedi- 

 tion to Whitefish Point, Michigan, in 1914. 



Xo. 26. Swales, Bradshaw.— The Ornithological Writings of Charles 

 Fox. 



X'o. 27. Wood, Xorman A., Smith, Frank, and Gates, Frank C. — The 

 Summer Birds of the Douglas Lake Region, Cheboygan County, 

 Michigan. 



Xo. 28. Ruthven, Alexander G. — Description of a Xew Species of 

 Atelopus from the Santa Marta Mountains, Colombia, (i plate.) 



