ACADEMY OF SCIENCES. 69 



also spent seven months at various other points in 18G1 and 1863, including 

 every month of the year except Sciptember. Though apparently furnishing few 

 peculiar species among the higher animals, this region is the most productive of 

 any in the number of species, most of tiiose of the more northern regions beinji- 

 also obtainable in some part of it. In marine species it is also thei richest for 

 the same reason, though it has not yet been sufficiently explored to give the full 

 numbers of these, or their exact range. It is here that the analogy to the 

 Mediterranean fauna is most marked, as will be furtlier mentioned in tiie report 

 on the Mollusca. There are several localities offering marked differences in 

 their lists of species, especially the islands which have a greater number of south- 

 ern species than the main land. The points explored are, however, too few for 

 a complete statement of these local faunas. The following is the comparative 

 number of species Ibund in this region and in all those south of Lat. 38^ : 



Mammals. 



This region 48 



All South of 38° 60 



It is quite probable that the proportion may be increased by further explor- 

 ations, and also that more of. the nortlioi'n species will be found south of Lat. 

 38° in the mountains, so that the total number will be greater than is found 

 north of that line. (See the approximate number hereafter.) 



IV. Middle and Northern Coast Ranges. 

 The next region to the north may be considered as embracing the Coast 

 Mountains from Lat. 34° 30' to about Lat. 38^2, or San Francisco Bay. It is 

 similar in character of surface to the preceding, but with more forest, more rain 

 and lower temperature in winter. The following animals are not known to oc- 

 cur north of it ; the evidence is, however, to a great extent, negative, as the 

 Coast Range north of the bay has been scarcely at all explored : 



MAMMALS. 



1. Putorius xanthogcny.t Gray, Yellow-cheeked Weasel. 



2. T/iomomijs hulbivorus Rich., California Gopher Rat. 



3. Hesperomys callforniciis GxyiB., California Wood Mouse. 



4. Neotoma fuscipes Cv., California Wood Rat. 



5. Arvkola edax Leg., Voracious Field Mouse. 



6. Lepus Trowbridgii Baird, Trowbridge's Hare. 



BIRDS. 



1. Call/pie costa; Bourc, Coast Humming Bird. 



2. Ti/raiDnis vociferans Swains., Noisy King Bird. 



3. Poospiza Belli C-ass., Bell's Finch. 



4. jEgialltis nivosa Cass., Snowy Plover. 



5. Porzana jamaicensis Gmel., Black Rale. 



6. Tachypctes aquilus Lixx., Frigate Pelican. 



7. Cymochorea homochroa Coues, Black Petrel. 



8. Piijjinus creatopus Cp., Red-footed Shearwater. 



9. Nectris fidiginosus Strickl., Sooty Shearwater. 

 10. Sterna Pi fceiLxyvR., Pike's Tern. 



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