TABLE OF CONTENTS. 



Page. 

 Letter of transmittal 13 



Introductory letter, by Dr. H. C. Yarrow, Acting Assistant Surgeon, U. S. A., Surgeon 



and Zoologist 15 



* * # # # * 



Chapter VII.— Report upon the collections of Hymenoptera made in portions of Nevada, 

 Utah, Colorado, New Mexico, and Arizona during the years 1872, 1873, 

 akd 1874, by E. T. Cresson, with ListofFormicidae,by Edward Norton 705 



Chapter VIII. — Report upon the collections of Diurnal Lepidoptera made in portions of 

 Colorado, Utah, New Mexico, and Arizona during the years 1871, 1872, 

 1873, aud 1874, with notes upon all species known to inhabit Colorado, by 

 Theodore L. Mead, and a List of all species collected, by W. H. Edwards 737 



Chapter IX. — Report upon new species of Zyg^nid^: and Bombycid^e collected in por- 

 tions of California and Arizona during the years 1871, 1872, and 1873, by 

 Richard H. Stretch 795 



Chapter X. — Report upon the collection of Diptera made in portions of Colorado and 



Arizona during the year 1873, by C. R. Osten-Sacken 803 



Chapter XI. — Report upon the collections of Coleoptera made in portions of Nevada, 

 UTAn, California, Colorado, New Mexico, and Arizona during the years 

 1871, 1872, 1873, and 1874, by Henry Ulke 800 



Chapter XII.— Report upon the collections of Hemiptera made in portions of Nevada, 

 Utah, California, Colorado, New Mexico, and Arizona during the years 

 1871, 1873, and 1874, by Prof. P. R. Uhler 827 



Chapter XIII. — Report upon the collections of Orthoptera made in portions of Nevada, 

 UTAn, California, Colorado, New Mexico, and Arizona during the years 

 1871, 1872, 1873, and 1874, by Prof. Cyrus Thomas 843 



Chapter XIV. — Report upon the collections of Neuroptera and Pseudo-Neuroptera made 

 in portions of Colorado, New Mexico, and Arizona during toe years 1872, 

 1873, and 1874, by Dr. H. A. Hagen 909 



Chapter XV. — Report upon the collections of Terrestrial and Fluviatile Mollusca 

 made in portions of Colorado, Utah, New Mexico, and Arizona during 

 the years 1872, 1873, and 1874, by Dr. H. C. Yarrow 923 



Chapter XVI. — Report upon the collections of Fresh-water Leeches made in portions of 

 Nevada, Utah, Colorado, New Mexico, and Arizona during the years 1872, 

 1873, and 1874, by Prof. A. E. Verrill 955 



