1908.] NATURAL SCIENCES OF PHILADELPHIA. 385 



country, which may possibly be due to the increased aridity and 

 greater sunlight of southwestern Arizona when compared with the 

 Tucson region. The usual position of specimens on the main branches 

 of Covillea would allow reflected light to play a very important part in 

 color bleaching. 



At Roeble's Ranch and along the Sonora Road this species was 

 found chiefly on mesquite, where the insects clung tightly to the 

 twigs and trusted so far to their protective coloration that those taken 

 were cautiously approached with the hands and suddenly seized. If 

 not captured they sprang with agility to some other part of the bush 

 and often escaped completely. They stridulated frequently, a faint 

 sikk, sikk, sik-sik-sik. At Yuma the species was found on greasewood 

 (Covillea) and was extremely active and wary in spite of the frightful 

 heat. 



ARPHIA Stil. 

 Arphia teporata Scudder. 



Three males and a female taken on rocky desert hillside in Sonora 

 Road Canyon, Tucson Mountains, July 25, belong to this species. They 

 are more thickly speckled and variegated with dark brown than a series 

 from Alamogordo, New Mexico, and all are faintly washed with reddish 

 brown. 



ENCOPTOLOPHUS Scudder. 

 Enooptolophus texensis Bruner. 



At Tucson along the Santa Cruz River on irrigated land this species 

 was found July 26 in moderate numbers. Eight males and six females 

 were taken, three of the females being in a green phase of coloration, 

 as previously noted in a Phoenix specimen,^ the green being on the head, 

 pronotum, dorsal face of caudal femora and to a certain extent on the 

 pleura, while another of the same sex is weakly greenish on the same 

 areas. The series exliibits an appreciable amount of variation in size, 

 particularly in the male sex. 



Enooptolophus subgracilis Caudell. 



A single female with rather short tegmina and wings, taken July 25 in 

 mesquite and rabbit-weed surroundings near the Sonora Road south- 

 west of the Tucson Mountains, is apparently referable to this species. 

 The wings, however, are faintly yellowish proximad, in this respect 

 resembling texensis. The measurements of this specimen are as follows : 



= Proc. Acad. Nat. Sci. Phila., 1907, p. 76. 



