848 



ZOOLOGY INSECTS. 



author had sufficient material before him (obtained chiefly from the collec- 

 tion of Dr. 13 runner cle Wattenwyl) to properly systematize this group, and 

 clear up the confusion into which it had fallen, I have thought it proper to 

 give here his arrangement for the benefit of our entomologists. 



Allow me to state that your collection has been of much value to me 

 in my investigations of this order, and that I trust the following brief report 

 may be accepted as a partial attempt on my part to repay you for your 

 kindness in submitting it to me. 



I remain yours, very respectfully, 



CYRUS THOMAS. 



LIST AND DESCRIPTIONS. 



The specimens of 1871, as I learn from the letters of Lieutenant 

 Wheeler and Dr. W. J. Hoffman, as well as by personal communication of 

 Dr. H. C. Yarrow, were collected chiefly along the route of the expedition, 

 from Carlin, on the Central Pacific Railroad, to Cottonwood, in the southern 

 part of Nevada ; a small portion only of the collection being obtained in 

 Northwestern Arizona. A portion of this collection is preserved in alcohol ; 

 others are dried specimens, which retain their colors. 



The collections of 1872, 1873, and 1874 were made in Utah, Nevada, 

 Colorado, New Mexico, and Arizona, by Dr. H. C. Yarrow, Dr. J. T. Roth- 

 rock, Dr. C. G. Newberry, Lieut, W. L. Marshall, Mr. H. W. Henshaw, and 

 others of the expedition. 



BLATTIDAE. 



The absence of this family from western collections would seem to 

 indicate at least that it was not well represented in that section. This also 

 corresponds with my observations in the sections I have visited. I do not 

 think I have seen a dozen specimens in all the collections I have examined. 

 I do not find a single specimen in this collection. 



MANTLDAE. 



There are three specimens belonging to this family in the collection, 

 one of which i.s new, and is named in honor of Lieutenant Wheeler, in 

 charge of the expedition. 



