376 PROCEEDINGS OF THE ACADEMY OF [July 



As far as known this species is found only in the Grand Canyon 

 region. The males of this form, instead of flying straight from one 

 place to another, rise usually very swiftly in a curve which, on account 

 of their size and coloration, makes them very hard to follow. The 

 females rely almost altogether on their powerful saltatorial ability. 

 Often in alighting the males would select the terminal twigs of a juniper 

 as resting places. In distribution it appeared to be very local. 



BOOTETTIX Bruner. 

 Bootettix argentatus Bruner. 



This very interesting species was taken at several localities and 

 always on its favorite shrub, the greasewood (Covillea tridentata). 

 At Yuma on July 27 it was found to be numerous and seven males 

 were taken; an immature individual was collected at Sentinel, July 27. 

 An adult male and an immature specimen were taken on the 

 Sahuaro slope southwest of the Tucson ]\Iountains, July 25. 



All the specimens collectq^l lack decided spots on the sutural margin 

 of the tegmina, and even traces are present in only one individual. 



AMPHITORNUS McNeill. 

 AmpMtornus nanus n. sp. 



Type : d^ ; Grand Canyon of the Colorado, Coconino County, Arizona, 

 altitude 7,000 feet, in conifer forest. September 11, 1907. Collected 

 by Morgan Hebard. 



Closely related to A. ornatus McNeill, but differing in the very small 

 size (length of body 14.5 mm.) and the shorter tegmina which hardly 

 surpass the tips of the caudal femora. 



Size quite small; form as usual in the genus. Head very slightly 

 shorter than the dorsum of the pronotum, occiput and interocular 

 region regularly but slightly ascending to the fastigium; interocular 

 region but little narrower than the greatest fastigial width ; fastigium 

 slightly acute-angulate, the immediate apex narrowly rounded, 

 median carina distinct on occiput, interocular region and fastigium, 

 very low except on the fastigium; face considerably retreating, inter- 

 antennal region rounding to the subrectangulate junction with the 

 fastigium ; frontal costa moderately broad and subequal to a very short 

 distance ventrad of the ocellus, considerably broader and subequal 

 thence to the clypeal suture, for its entire length depressed within its 

 margins and punctate; eyes subacute-ovate, hardly prominent when 

 viewed from the dorsum; lateral foveola distinct, impressed caudad; 

 antennae about equal to the head and pronotum in length, rather 

 robust, slightly depressed proximad, tips bluntly acuminate. Pro- 



