1908.] NATURAL SCIENCES OF PHILADELPHIA. 367 



Near Sonora Road, Southwest of the Tucson Mountains, Pima County, 

 Arizona. — July 25. Several miles from the Tucson Mountains col- 

 lecting was carried on for a short time in a grassy area with occasional 

 bunches of rabbit- weed. In this locality Orthoptera were found to be 

 far more plentiful than on the surrounding more truly desert plain. 

 Among the species taken were Psoloessa texana, Encoptolophus sub- 

 gracilis, Tomonotus aztecus, Trepidulus rosaceus, Trepididus melleolus, 

 Derotmema laticinctum and Hesperotettix festivus. 



Roehle's Ranch, near Coyote Springs, Pima County, Arizona. — July 24 

 and 25. This locality is in the lower level of a plain stretching from 

 the Tucson to the Comobabi range, near a large arroyo known as Roeble's 

 Wash. It is in a uniform mesquite and rabbit- weed region, with no 

 striking difference in conditions for a number of miles to the northeast. 

 Two specimens of Trepidulus melleolus were the most interesting 

 forms taken. 



Yuma, Yuma County, Arizona. — Elevation about 150 feet, July 27 

 and 28. To the east of Yuma the desert stretches, broken by occa- 

 sional low volcanic hills, where it is too hot for even the greasewood 

 to thrive and desert Orthoptera are almost wholly absent. Along the 

 Colorado River, however, is a wide strip of willows, and back of these 

 ground heavily overgrown with arrow-wood (Plv^hea sericea) and 

 other reeds where collecting was more productive. These, although 

 so near the river, were nevertheless parched with the heat. To the 

 east along the Gila River a great expanse of high weeds was found, 

 but so dry that many fell to pieces when touched and insect life was 

 extremely scarce. In the irrigated tract below Yuma Orphulella 

 compta was very abundant. In the town at night Gryllidse and thou- 

 sands of beetles and other insects swarmed around the arc lights. All 

 of these Gryllids flew rapidly about, and would have been difficult to 

 capture had they not come to the light dazed and confused. 



Williams, Coconino County, Arizona. — Altitude, 6,748 feet. Sep- 

 tember 13, The little collecting done here was accomplished near the 

 station in a field of short weeds and grass, and also near the pine 

 "glades" as they may be called. The whole country about Williams 

 is on nearly the same plane but gently rolling. Over this area pines 

 were thickly scattered, underneath which was practically no under- 

 brush but very green grasses, this vegetation imparting to the whole 

 country a park-like appearance. In the vacant field, where the weeds 

 were more abundant than elsewhere, Orthoptera were found more 

 plentiful than we had expected to find them at this elevation. 



Anita, Coconino County, Arizona. — Altitude about 6,500 feet. Sep- 

 tember 11. At this small station, between W^illiams and the Grand 



