16 GEOLOGICAL SUKVEY OF THE TERRITORIES. 



and invertebrate natural history generally. The results of his labors 

 will appear in the annual reports, and in the beautiful quarto volume 

 on the Geometrid Moths. Mr. P. E. Uhler visited Colorado during the 

 summer. His collection of insects amounted to about 1,000 species. 

 In the Annual Eeport for 1875, he will present an elaborate essay on the 

 geographical distribution of insects. A very valuable paper on the 

 Hemiptera of our Western Territories appeared in No. 5 of the Bulletins 

 for the year 1875, illustrated with wood-cuts. 



Two volumes, quarto, by Professor Cope, are in course of preparation, 

 and will be published within a year if the Government provides the 

 money for completing the engraving : — 



Volume III, " Vertebrate Paleontology of the Eocene Formations of 

 the West." 



Part 1. Distribution and Eelations of the Tertiary Basins of the West. 



Part II. The Vertebrata of the Eocene. 



Part III. The Eelations of the Fauna of the Eocene. 



Volume IV, " Vertebrate Paleontology of the Miocene Formations of 

 the West." 



Part I. The Fauna of the White Eiver Epoch. 



Part II. The Fauna of the Loup Fork Epoch. 



Part III. The Eelations of the Fauna of the White Elver and Loup 

 Fork Epochs. 



The Survey is under great obligations to Dr. Elliott Coues, IT. S. A., 

 Mr. Eobert Eidgway, and Mr. Samuel H. Scudder, for very valuable 

 contributions to its publications. 



The obligations of the Survey for favors of various kinds have been 

 numerous as usual, but few of them can be mentioned in this connection. 



From D. Appleton & Co., of New York, very great assistance has been 

 received by permitting the use of the illustrations of Colorado scenery, 

 taken from their magnificent publication "Picturesque America." The 

 publishers of that work were permitted by the Interior Department to 

 use the photographs of the Survey on condition that the Survey should 

 have the electrotypes of the illustrations for use in the reports, and 

 some of the beautiful cuts in this report are the result of their gen- 

 erosity. 



The illustrations for this report have been prepared in part, while the 

 text was passing through the press. This fact will account for irregu- 

 larities in the numbering of them. The pen-sketches and sections were 

 made by Mr. W. H. Holmes, a member of the Survey. For beauty and 

 accuracy they cannot be surpassed, and they add greatly to the value 

 of the report. 



To the Union Pacific, Denver Pacific, Kansas Pacific, and Denver 

 and Eio Grande Eailroads, the Survey is under obligations for half-fare 

 tickets for its members. 



The various changes which have occurred in the personnel of the 



