300 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



Specimens of humphreysii from the following localities have 

 been examined. New Mexico: Silver City, Grant County. Ari- 

 zona: Verde Valley, directly north of Clarksdale; Clarksdale; 

 Globe; Phoenix; Sabino Basin, Santa Catalina Mountains; Pima 

 Canyon, Santa Catalina Mountains; Santa Catalina Mountains 

 (2 lots, no detailed locality); Douglas; Madera Canyon, Santa 

 Rita Mountains; Stone Cabin Canyon, Santa Rita Mountains; 

 2 miles north of Oro Blanco, Tumacacori foothills, Santa Cruz 

 County; Atascosa Mountain, Pajaritos Mountains, Santa Cruz 

 County : Nogales ; Coyote Mountains, at north end of Baboquivari 

 range ; Sycamore Canyon, Baboquivari Mountains, almost due east 

 of Baboquivari Peak; Schaeffer Canyon, Baboquivari Mountains, 

 at north base of Mount Mildred on east face of Baboquivari range ; 

 Baboquivari Mountains (no detailed locality) ; Fortification Rock, 

 Baboquivari Valley, east-southeast of San Miguel ; Fresnal ; Alamo 

 Canyon, Ajo Mountains, about 30 to 40 miles southeast of Ajo. 



Hebard (1925) reported one male and nine females of hum- 

 phreysii from the Copete mine, 30 miles east of Carbo, Sonora. 

 He commented on the fact that the majority of that series differed 

 from Arizona material in having redder hind tibiae. Without 

 examining the male, it cannot be known whether humphreysii or 

 cochisei was represented. Other localities mentioned in literature, 

 from which I have not seen material, are the northern area of 

 Sonora cited by Tinkham (1947) and the Galiuro Mountains and 

 Chiricahua Mountains of Arizona (Ball et al., 1942). Hebard 

 (1917) noted that Kirby (1910) incorrectly recorded 7ieomea;icawa 

 from Mexico, there then being no authentic record from that coun- 

 try of humphreysii or its synonyms. 



Barytettix humphreysii is found from the northei;n part of the 

 Lower Sonoran Zone through the Upper Sonoran. Tinkham 

 (1947) considers it "one of the characteristic and dominant spe- 

 cies" of what he calls "the Sonoran Live Oak Zone of the Upper 

 Sonoran." In several instances, as in Schaeffer Canyon and in 

 the Coyote Mountains, Mr. Rehn's notes record finding hum- 

 phreysii lower on the desert foothills than the zones occupied by 

 oaks, but in other places (Sabino Basin; Atascosa Mountain) it 

 occurred in both strong and scattered stands of oaks. Sahuaro 

 (Carncgiea gigautea Britton and Rose), paloverde (Cercidium 

 or Parkinsonia), cholla (Opuntia) and sotol (Dasylirion) were 

 dominant plants often characteristic of the habitats. In the Coyote 

 Mountains, humphreysii was found in "pockets" of such plants 

 between great boulders on very steep, rugged south slopes of a 

 canyon. Again, groves of oaks and acacia, interspersed with 

 clumps of fine grasses, were typical surroundings. In Sycamore 



