report oe entomologist. 
19 
northern plains region we have not found occuring in the valley 
of the Arkansas. 
The frontice piece is a map giving the main river sys¬ 
tems and water sheds of Colorado with the points named where 
our. collections have been made. Upon page 20 I have given 
a list of the places where collecting has been done, with their alti¬ 
tudes, and with each species I have given all the localities from 
which it has been taken by us. The reader will thus be able to 
make out the distribution of such species so far as determined by 
our records. 
A CK N O W LEDGM E N •T S. 
determination OF SPECIES. 
The Blattidse here reported have been determined by Prof. 
Lawrence Bruner or by comparison with examples named by him. 
The Mantidse and Phasmidse have been determined by Professor 
Bruner, A. N. Caudell or E. D. Ball. The entire collection of 
Tettiginse has been through the hands of Prof. Albert P. Morse 
and are reported as named by him. The remainder of the Acrid- 
iidse have been named very largely by comparison with examples 
of the various species that were determined for the College by 
Prof. Bruner or Dr. S.H. Scudder, to whom doubtful and unknown 
species have been referred. The more readily determined species 
have been named by E. D. Ball or the writer. All errors are 
chargable to me, as I have worked over the entire collection during 
the past year, adding many species and many new records and 
changing many names. Prof. Morse has also determined several 
species of Trimerotropis and Spharagemou for me. 
COLLECTORS. 
The collection upon which this report is based has been ac¬ 
cumulated during the past thirteen years as the result of the ef¬ 
forts of many helpers. An examination of 1,500 entries upon the 
Accessions Book shows that about 50 per cent, of the records are 
from collections and observations made by E. D. Ball, about 25 
per cent, by the writer, and the remaining 25 per cent, by others, 
most prominent among whom are S. A. Johnson, E. S. G. Titus, 
E. P. Taylor, F. C. Bishopp and C. F. Baker. I have also received 
several species from Prof. T. D. A. Cockerell from the vicinity of 
Colorado Springs and Pike’s Peak. 
The original plan was to publish this report in joint author¬ 
ship with Prof. E. D. Ball who was, at the time, my first assistant; 
but after his appointment to the Chair of Animal Biology in the Agri¬ 
cultural College of Utah, this plan had to be abandoned. I wish 
specially to acknowledge my obligations to Prof. Ball for the large 
