206 Field Columbian Museum — Zoology, Vol. III. 



The desert Sonoran zone reaches an altitude of about 4,500 as marked by 

 the upper limits of the desert palms, yuccas, mescal, and mesquites. The 

 upper Sonoran on the west slope does not reach so high by at least 500 ft. 

 as marked by the mesquites, yuccas, and mescal plants. 



" On the south the Hanson Laguna Mountains are separated from the 

 San Pedro Martir by a stretch of about fifty miles of broken hills and 

 mesas, and at San Matias Pass by a short strip of desert. This inter- 

 vening country ranges from 3,000 to 6,000 feet but lacks the yellow pine 

 forests of the lagoon region. The pihon belt however is practically con- 

 tinuous except on the short desert strip at San Matias Pass." 



After leaving El Alamo his first camp was atOjos Negros, whence 

 he passed on to Hanson Lagoon, about 5,000 feet altitude, then to Agua 

 Escondido, Palomar, and Labozo, all in the same vicinity. Farther ex- 

 ploration was prevented by a snowstorm — it was now the 17th of Novem- 

 ber — which drove him out of the mountains and compelled his return to 

 Ensenada on the coast. A large and valuable collection of mammals was 

 obtained from the two ranges and the coast regions on either side, the 

 only one in fact in any way approaching completeness, that has ever been 

 procured in this country. 



A map of the region traversed by Mr. Heller, with his routes indi- 

 cated, accompanies this paper. A great portion of these mountain 

 ranges has never been surveyed by the government, and such maps as are 

 published are very incomplete, and none of the places visited by Mr. 

 Heller is recorded. While not claiming for the present map any extreme 

 accuracy, it nevertheless shows in detail the position of the various local- 

 ities mentioned, where camps were made and the collection procured, and 

 it is hoped it may be found serviceable to those investigating the fauna of 

 this region. It was constructed from a sketch map made by Mr. Heller 

 on his journey, with the assistance of the charts of northern Lower Cali- 

 fornia published by the United States Government. The views given in 

 the plates are from photographs taken by Mr. Heller in the places named. 



ORDER UNGULATA. 



FAM. CERVID^E. 



ODOCOILEUS. 

 Odocoileus hemionus. 



Odocoileus hemionus. (Rafin.) Am. Month. Mag., 181 7, 1, p. 

 436, Elliot, Syn. N. Am. 1901, p. 42. 



1 Specimen: San Quentin, Pacific coast. 



This is a buck two or three years old, with the pure white tail and 

 black tip. I cannot refer the specimen to any other species or 



