6 FURTHER RESEARCHES ON NORTH AMERICAN ACRIDIID^. 



examining advantageously a large portion of the affected States, 

 which I had intended to study, a change of the original plan became 

 necessary. I decided to spend the remainder of the season in a trip 

 through northern Texas as far as the Staked Plains, and return 

 through Oklahoma and the Indian Territory, visiting the Wichita 

 Mountains en route, and northwestern Arkansas, if practicable, at 

 the end of the trip. 



This course was decided upon with the double purpose of examin- 

 ing a district whose locust fauna was relatively little known and of 

 studying the biological conditions presented by the transition between 

 the humid Mississippi Valley and the Great Plains, particularly with 

 reference to the distribution of brachypterous locusts, a study of 

 which during several years in New England, on the Pacific Coast in 

 the summer of 1897, and in the southeastern States in 1903 under the 

 auspices of the Carnegie Institution, led to the conclusions in my 

 first report (Publication No. 18, Carnegie Institution of Washington) 

 relative to the significance of brachypterism . 



Going south to Denison, Texas, this plan was put in effect. 

 Stops were made at Bonita, in the western or Upper Cross Timbers, 

 Wichita Falls, Clarendon, and as far west as Amarillo, on the Llano 

 Bstacado, in the center of the Panhandle. At this point I turned 

 back, retracing my course to Quanah, thence northward through 

 southern Oklahoma, paying a brief visit to Mount Sheridan, one of 

 the two highest peaks of the Wichita Mountains. From thence, after 

 a stop at Shawnee and another at Wilburton to examine an interest- 

 ing bit of prairie meadow noted on the outgoing course, I returned to 

 western Arkansas and visited Magazine Mountain (whose summit is the 

 highest point of land between the Appalachian and the Rocky Moun- 

 tains), the Arkansas Valley, and the Ozark uplift at Winslow and 

 Fayetteville. 



The trip was carried out successfully as outlined, collecting being 

 brought to a close at Fayetteville, Arkansas, with the advent of rainy 

 weather in early September. On the return trip to Wellesley, a day's 

 stay at Indianapolis with Prof. W. S. Blatchley, State geologist, who 

 has made a special study of the Orthoptera of that State, and another 

 spent in a visit to the collection of Orthoptera at the National Museum, 

 in charge of Mr. A. N. Caudell, proved most profitable. 



Over 9,000 Orthoptera, of which the great bulk are Acridiidae, 

 representing about 120 species, including several undescribed forms, 

 were secured, together with a mass of data relating to distribution and 

 biology. 



