510 Recently published Orniihological Works. 



200 feet at its western edge to a height of 1300 feet at its 

 eastern boundary on the crest of the Berkeley Hills, 



This campus is, on its lower elevations, planted with 

 groves and gardens, while the higher parts are truly 

 '^wikP^; it contains a lurge varied avifauna of some 97 

 species, and Mr. Grinnell has here given us a list of these 

 with remarks on the status of each. A previous edition 

 published in the " University of California Chronicle " in 

 1911, contained the names of 76 species only. 



Grinnell on the Birds of the Valley of the lower Colorado 

 River. 



[An account of the Mammals and Birds of the lower Colorado Valley, 

 with special reference to the distributional problems presented, by 

 Joseph Grinnell. Univ. California Publ.inZool. vol. xii. 1914, pp. 51-294, 

 11 pis., 9 text-figs.] 



The River Colorado, after passing through the Grand 

 Canon, which is chiefly in the State of Arizona and which, 

 with other caS.ons, forms the characteristic feature of the 

 middle third of the river, forms in the lower part of its 

 course the boundary line between the States of California 

 and Arizona, from Mojave to Yuma, a distance of about 

 150 miles in a straight line. Below Yuma, the river enters 

 Mexican territory and shortly afterwards empties itself into 

 ihe Gulf of California. 



The present paper deals with the fauna of this lower third 

 of the river, where the stream runs in sober fashion in a 

 more or less wide valley, while the country on either side 

 forms one of the driest and hottest deserts in the world. 



An expedition was led by Mr. Grinnell between February 

 and May, 1910, to carry on field-work in this region. The 

 party commenced their survey at the town of Needles and 

 travelled by boat down the river, from place to place, ob- 

 taining 1374 specimens of birds and 1272 of mammals, all 

 of which are now in the California Mu.seum of Vertebrate 

 Zoology. 



In discussing the distribution of the forms of animal life 

 here and elsewhere, Mr. Grinnell recognizes what he calls 

 three distinct orders of distributional behaviour ; these he 

 terms zonal, faunal, and associational. 



