68 PROCEEDINGS OF THE CALIFORNIA 



islands are included in the same zoological region, their land animals being 

 identical (except some mollnsca, insects, and perhaps a reptile). The surface of 

 this region is mostly hilly or undulating, sparsely wooded, watered by rivers 

 which either dry up entirely, or sink in the dry season before thty reach the 

 ocean, (except the Santa Clarti) and covered either by grass and low herbage, 

 or shrubbery and trees. The climate is much cooler in summer thau that east 

 of it, and milder in winter, with far more rain, confined to three or four cold 

 months. There is of course a close connection between the fauna of this region 

 and that of lower California, but the latter at Cape St. Lucas is very distinct, 

 and, to a great extent, peculiar. 



The animals which do not ^tend nortli of this region as far as known are as 

 follows : 



MAMMALS. 



1. Vidpcs littoralis Baird, Little Gray Fox. 



2. Thomomijs umbrinus Rich., Arizona Gopher Rat. 



3. Neotoma mexicana Baird, Mexican Wood Rat. 



4. Hesperomijs sonoriensis Leo., Sonora Wood Mouse. 



BIKDS. 



1. Buteo zonocercus Sclat.. Black Hen Hawk. 



2. Panyptila melanoleuca Baird, White-throated Swift. 



3. Chordeiles texensis Lawk., Texan Night Hawk. 



4. Vireo pusillus Coues, Little Greenlet. 



5. 31imus caudatus Baird, Long-tailed Mocking Bird. 



6. Campylorhynchus brunneicapilhisljAFREs., Brown-capped Cactus Wren. 



7. Polioptila melamirahxvfR.,  Black-tailed Gnatcatcher. 



8. Ammodroimis wstrafiis Cass., Long-billed Beach Sparrow. 



9. Icterus cucullatm Swains., Hooded Oriole. 

 10. Brachyramphus hypoleucus Baird, Southern Auk. 



All of these are land birds except the last, and extend to the Colorado val- 

 ley, or farther east, except the eighth, a sea-shore species. 



REPTILES. 



A species of Uta. and a lizard from some of the islands, were not found 



elsewhere by me, but probably have a wider range. Some reptiles, said to 



come from San Diego, were probaljly obtained in the mountains or deserts east 

 and south of there. They are : 



1. Gerrhonotus Webbi Baird, Webb's Lizard. 



2. G. olivaceus Baird, Olivaceous Lizard. 



But the following probably belong chiefly to this region, or southward : 



3. Crotahis Hallowelli Cp., HallowelFs Rattlesnake. 



4. Drymobius testacem Say, Coppery Whip Snake. 



5. Eutcenia Couchii Kemnic, Couch's Garter Snake. 



It is so dry that Batrachia are scarce, and are of species more common north- 

 ward. No species of fresh water fishes are kiiown from this region. 



I collected near San Diego from Nov. 4th, 1861, to May 24th, 18G2, and 



