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Bulletin American Museum of Natural History. [Vol. XXXV, 



began to obtain specimens of two species of large lizards, one a Sauromalus, 

 the other apparently Ctenosaura hemilopha. They occurred in shallow 

 depressions under large stones and were usually detected by their tails, 

 which were not always drawn in out of sight. They were captured easily 

 by turning the stones, which were not generally too large for a couple of 

 men to handle. Forty-seven specimens in all were captured alive, the 

 largest being thirty inches long. The Sauromalus proved to be new to 

 science. Two rattlesnakes (Crotalus mohssus) were also secured and a few 

 mice and birds, while the botanist obtained a new century plant (Agave 

 dcntiens). A new species of mouse obtained here has been named Peromys- 

 cus stcphani. San Esteban is about 4 miles in diameter, exceedingly rough 

 and mountainous, with a height of 1800 feet. It lies 8 miles S. W. of 

 Tiburon, is without fresh water and is uninhabited. 



Fig. 25. Valley at south end of Tiburon Island, Gulf of California. 



The flow of the tides is very strong in this part of the Gulf. During the 

 night the ship dragged anchor somewhat on the ebb tide. When we left 

 for Guaymas at 8:30, the anchor came up minus a fluke which had broken 

 off. The tide was running fiercely, and with half a gale of wind also in our 

 favor, we started for Guaymas under sail and steam. Passing San Pedro 

 Martir Island at noon, where it was impossible to make a landing on ac- 

 count of the weather, we reached Guaymas after dark. 



On the following morning the Captain and I called on the American 

 Consul and some of the local officials. Dr. Bartsch left the ship at this 

 point on his way to Panama, but finding no satisfactory transportation 

 proceeded to Washington by rail. Two crates of live reptiles, large lizards 



