SUMMARY OF THE ZOOLOGICAL COLLECTIONS. 
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(6.) Hesperomys.....Camp 147, Mojave river, Cal. 
131. -(Snake.)..............Camp 149, do. 
132. Fishes....... ....Camp 146, do. 
This stream rises in the coast range of mountains, and flows towards the Great 
Colorado, hut probably sinks in the sand long before reaching that river, Where 
we saw it, it was a bold rivulet of clear and pure water. The lot of fishes taken 
from it comprised about three species, probably all new to science. 
No 133. Fishes ......Great Colorado river. 
We did not observe more than two species of fishes in this stream, one of which 
was the Gila elegans , the other unknown. 
No. 135. Fishes.Pueblo creek, New Mexico. 
This was the most beautiful mountain stream that we observed on our journey. 
Its pure and clear water came tumbling and bubbling over the rocks in such a 
manner as to forcibly remind us of the mountain brooks of the Atlantic States. It 
probably empties into the San Francisco river. From it we obtained a single species 
of fish, the largest specimen not being more than 2 or 2-| inches in length. 
No. 137.-• (Lizard).Cajon Pass, California. 
138. Hesperomys..Williams’ river, New Mexico. 
(a.) Hesperomys....Williams’ river, New Mexico. 
139. -. (Snake)......Great Colorado river. 
(a.) Hesperomys...Great Colorado river. 
140. Neotoina-. ....San Francisco mountains, New Mexico. 
142. Eana ....Camp 134, Williams’ river, New Mexico. 
(a.)-. (Shells)....Camp 134, Williams’ river, New Mexico. 
145. Neotoraa..San Francisco mountains, New Mexico. 
146. Neotoma.....Camp 90. 
148. Scorpio ....Williams’ river. 
151. Crotalophorus..Little Colorado river. 
152. liana ..White Cliff creek, New Mexico. 
(a.) Rana....White Cliff creek, New Mexico. 
This tributary of Williams’ river is a stream of clear and pure water, and the 
frogs here obtained are probably identical with those obtained from that stream. 
No. 153. Hesperomys ..Head waters of Williams’ river. 
(a.) Hesperomys ..Head waters of Williams’ river. 
154. Neotoma..Great Colorado river. 
155. Geomys fulvus........... ....Camp 99, Picacho mountains, New Mexico. 
156. Sciurus aberti.San Francisco mountains, New Mexico. 
(a.) Sciurus aberti..San Francisco mountains, New Mexico. 
(b.) Sciurus aberti. San Francisco mountains, New Mexico. 
This beautiful squirrel was very common in the San Francisco range of mountains, 
living among the tall pines that here abound, and finding its chief subsistence in 
th e pinones, the fruit of the Pinus edulis. We did not observe it farther west than 
Mount Sitgreaves. 
No. 157. Spermophilus beecheyii...Cocomongo Rancho, California. 
• (a.) Spermophilus beecheyii...Cocomongo Rancho, California. 
(6.) Spermophilus beecheyii....Coconiongo Rancho, California. 
These singular animals are very numerous near the Cocomongo Rancho, and, 
indeed, throughout the valley of the San Gabriel river. They were always found 
living in communities, and in their habits, generally, very closely resembled the 
prairie dog, (Cynomys ludovicianus .) Their size is about that of the common grey 
squirrel, (Sciurus carolinensis ,) or perhaps a little larger. Their color is usually a 
