366 PROCEEDINGS OF THE ACADEMY OF [J^ly, 



this pool were high cat-tails and other thick growths of plants, in which 

 situation Orthopters were found to be very plentiful, and likewise among 

 a nearby dense thicket of wild sunflowers and bushes. In these situa- 

 tions the following species were taken: Paratettix toltecus, Syrhula 

 fusco-vittata, Scyllina calida, Encoptolophus texensis, Trepidulus 

 rosaceus, Conozoa carinata, Anconia Integra, Schistocerca vaga, ^oloplus 

 tenuipennis, Melanoplus brownii, M. atlanis and (Ecanthus quadripunc- 

 tatus. In the irrigated fields near the river some specimens were found, 

 although by no means as many as might have been expected in a 

 locality apparently so favorable. On the typical desert greasewood 

 plain forms peculiar to a like environment, such as Heliastus aridus, 

 Ligurotettix kunzei, Derotmema laticinctum and Psoloessa texana, were 

 taken. In the city at night about the arc Hghts thousands of Gryllids 

 swarmed and could be easily captured in great numbers. 



Sonora Road Canyon, Tucson Mountains, Pima County, Arizona. — 

 Altitude about 3,000 feet. July 25. The old Sonora trail after leaving 

 Tucson winds around the southeast base of the rather low Tucson 

 Mountains, then turns sharply and crosses the range by following up 

 an arroyo or torrent bed and traversing a very low pass in a shallow 

 canyon with sloping sides. The canyon is very rough and much of the 

 rock exposure is dull reddish in color. The vegetation is composed in 

 large part of desert foothill types, the most noticeable of which are 

 numerous sahuaro {Cereus giganteus), palo verde {Cercidium torrey- 

 anum), choUa {Opuntia sp.) and the peculiar Koeberlinia spinosa. 

 Orthoptera were few in number, but the species found were of very 

 great interest and differed noticeably from those of the surrounding 

 plains. These included a new mantis Yersinia sophronica, a new 

 Truxalid Horesidotes papagensis, Ageneotettix australis, Aulocara 

 rufum, Arphia teporata and Phrynotettix magnus. The majority of 

 the specimens taken showed considerable adaptation of their coloring 

 to the reddish exposures. 



Sahuaro Slope, Southwest Side of the Tucson Mountains, Pima County, 

 Arizona. — July 25. After crossing the Tucson range the Sonora trail 

 descends the extensive and gentle southwestern slope of the mountains 

 through a numerous growth of sahuaro or giant cactus {Cereus gi- 

 ganteus), with attendant greasewood {Covillea tridentata) bushes grow- 

 ing thickly and often to a height of over six feet. Many other plants 

 flourish, the intervening ground between them being usually quite 

 bare, as is often the case in this desert country. On the grease- 

 wood in this situation Ligurotettix was very plentiful and its faint 

 stridulation was to be heard on every side. Most of the collecting 

 was done at an elevation of about 2,500 feet. 



