1908.1 NATURAL SCIENCES OF PHILADELPHIA. 365 



AN ORTHOPTEROLOGICAL RECONNOISSANCE OF THE SOUTHWESTERN 

 UNITED STATES. PART I : ARIZONA. 



BY JAMES A, G. REHN AND MORGAN HEBARD. 



During the summer of 1907 Orthopterological field work was carried 

 on by the authors at a number of stations extending from El Paso, 

 Texas, and Albuquerque, New Mexico, to southern and north-central 

 California, the material and notes secured being very extensive and of 

 great value. In this paper we present the results of our work in 

 Arizona, giving first an idea of the environment of the various locali- 

 ties visited. 



A trip to the little known Baboquivari range in southern Pima 

 County was interrupted and of necessity abandoned on account of the 

 flooded condition of the country to be traversed. Much good material, 

 however, was taken before our party was compelled to return to 

 Tucson. 



Mr. Otho Poling, the well-known Lepidopterist of Quincy, Illinois, 

 accompanied us through southern Arizona and assisted in collecting 

 much of the material, while all secured in northern Arizona was taken 

 by the junior author. The number of specimens examined was nine 

 hundred and seventy-three, while the species numbered sixty-three. 



Several specimens collected at Nogales and Grand Canyon by Dr. 

 P. P. Calvert in 1906 and a small series taken in or near the Huachuca 

 Mountains by Mr. H. A. Kaeber in the summer of 1907 have also been 

 studied and inserted in this paper, but these are not included in the 

 count of species and specimens. 



The types of all the new forms are in the Hebard Collection. 



Tucson, Pima County, Arizona. — Elevation about 2,400 feet. July 

 23 and 26. The immediate vicinity of Tucson is a nearly level desert 

 plain, extending from the Santa Catalina to the Tucson Mountains, 

 drained by the Santa Cruz River and other less constant and smaller 

 streams and washes. A considerable portion of this plain is covered 

 with stretches of greasewood (Covillea tridentata) and scattered growths 

 of various cacti. In the vicinity of the water courses and washes 

 mesquite {Prosopis sp.) is the predominating vegetation, attaining a 

 height of twenty feet or more in favorable locahties, especially along 

 the Santa Cruz River. The most successful collecting was found in 

 and about a vacant lot on the edge of the city, in the central part of 

 which was a small pool of water, the outlet of a city drain. About 

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