


480 NATURALIST IN CALIFORNIA. 
T'railli?) ; also, Richardson's Pewee (Contopus Richard- 
sonii) and Black-cap Warbler (Myiodioctes pusillus).* The 
only mammals I obtained were a small Bat ( Vespertilio Yu- 
manensis?), and the typical gray variety of Harris’ Sper- 
mophile, shot some miles from the river on May 28th, the 
day I started to return to the coast. The reptiles added 
were the Colorado Toad (Bufo alvarius), an enormous 
semiaquatic species nearly as smooth as a frog; and several 
others on the way westward which do not appear to inhabit 
the valley. 
Fish seemed to be scarce in this muddy river, and I only 
obtained three species of cyprinoids: a large one called Col- 
orado Salmon (Ptychocheilus lucius), a Gila (G. robusta?), 
and one allied to the Suckers ( Catostomus). Mollusca were 
equally rare, and a few specimens of the remarkable Physa 
humerosa and Planorbis ammon were all I found. My col- 
lection of vertebrata made at Fort Mojave numbered 100 
species, and 250 specimens. 
I might enumerate many other species that have been ob- 
tained in the Colorado Valley by other collectors, but it 
would be too long a list. I have, altogether, counted up 
twenty-three species of mammals, one hundred and nine- 
teen birds, and ten reptiles, as found there at various sea- 
sons, some of which I heard of as visiting Fort Mojave 
later than my stay there. By May 15th the spring rains 
were over and the short vegetation of the mésas was drying 
up. About this time also the river was rising rapidly, 
bringing down cold water from the mountains, and moder- 
ating the heat which had been as high as 116° in the shade 
on April 20th. The summer wind began to blow from the 
south, and would, probably, bring some of the latest birds 
with it, while others would come after the floods to seek the 
food left by the subsiding waters. Among these have been 
seen the strange Vulture-eagles ( Polyborus Audubonii and 
oe SS la eaten re 

COD cad e Mi pese only one of the rare Western Warbler (Dendraca periden- 
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