18 INTRODUCTORY LETTER. 



Pitch, and Grass Valleys, through Fremont's Pass westward to the regular 

 wagon road, thence south to Tocpierville. At the last mentioned point, a 

 minor party was organized for special operations, and consisted of two col- 

 lectors and assistants. This section, under myself, proceeded south to Saint 

 George, Utah, via Washington, Utah, thence westward and northward to 

 Pine Valley, east to Harmony, and north to Beaver, and finally to Provo, 

 where considerable time was spent, as at the commencement of the field 

 work. By moving leisurely from point to point, and making detours from 

 time to time to localities of special interest, many valuable specimens were 

 secured, as well as much important information that it would hardly have 

 been possible otherwise to have gained. From Provo, the party proceeded 

 to Salt Lake City, and disbanded. 



The reports of the operations of the season will show that while much 

 was accomplished of value to our own knowledge of the animal and vege- 

 table characteristics of the region specially visited, the extensive collections 

 obtained will enable a distribution to foreign museums of duplicate speci- 

 mens, many of them unique, and highly desired to fill gaps in the Old 

 World representations of North American zoology. 



Finding that the results of the previous season fully warranted the 

 increased facilities then afforded this branch of the expedition, it was 

 determined in 1873 to prosecute with renewed vigor observations incident 

 to this interesting study, and the following were named to continue the 

 work, viz: Dr. J. T. Rothrock, Dr. C. G. Newberry, Dr. 0. Loew, and Mr. 

 II. W. Henshaw. The party rendezvoused at Denver, Colo. ; Dr. Rothrock 

 being assigned to Lieutenant Marshall's party, Dr. Newberry to Lieutenant 

 Russell's, and Dr. Loew to your own, Mr. Henshaw setting out in advance 

 to make collections at special points. 



The party under Lieutenant Marshall left Denver, and proceeded west- 

 ward through Middle Park, visiting Georgetown, Fairplay, South Park, 

 Roaring Fork, Cochetopa, Saguache, and Tierra Amarilla, The party to 

 which Dr. Newberry and Dr. Loew were attached operated in Northern and 

 Southern New Mexico and Arizona; Mr. Henshaw joining Lieutenant Rus- 

 sell's party at Fort Wingate in Western New Mexico, and proceeded through 

 Western and Southern Arizona. The very extensive collection of these gen- 



