1909.] NATURAL SCIENCES OF PHILADELPHIA. 155 



seventeen from the Grand Canyon region, the New Mexican series is 

 seen to have the caudal angle of the disk of the pronotum more acute 

 in both sexes. 



HADROTETTIX Scudder. 

 Hadrotettix trifasciatus (Say). 



A single male of this species was secured on a rugged hillside near 

 Silver City, July 20. It is a very small specimen. 



ANCONIA Scudder. 

 Anoonia caeruleipennis Bruner. 



This most interesting species, which" was described from a single 

 female from Hawthorne, Nevada, is represented by two males and 

 seven females from the vicinity of El Paso. When compared with the 

 brief original description of the species the specimens agree fully, and 

 as a series show no differences worth noting, except a lightening or 

 darkening of the cinereous base color. 



One of the rather striking features of this species is the subinnated 

 disk of the prozona and metazona, while the principal sulcus is deeply 

 impressed and the median carina elevated or subtectate on the cephalic 

 portion of the prozona. The ease with which this species in life loses 

 its caudal limbs is remarkable. 



Two females were taken on the mesa at the east base of the south 

 peak of the Franklin Mountains, July 9; one male and two females 

 were taken along the edge of the mesa, July 11; while one male and 

 three females were secured in the irrigated section along the Rio Grande 

 on the same date. 



HELIASTUS Saussure. 

 Heliastus aridus (Bruner). 



This characteristic desert species was taken at El Paso, Alamogordo, 

 Silver City and Deming, in all of which localities it was found on rocky 

 areas or bare spots between the greasewood or mesquite bushes. At 

 El Paso, July 9-11, it was taken on the mesa, the broken edge of the 

 mesa and on the slopes of the Franklin Mountains, a series of fifteen 

 males and fourteen females being collected. Three males were secured 

 in suitable surroundings in the mesquite and rabbit-weed plain at 

 Deming, July 18; a pair at Alamogordo, July 13, in the greasewood belt, 

 and an immature female at Silver City, July 20. 



The Deming individuals have hoary white very prominent in their 

 coloration, while several of the El Paso series have a strong bluish-gray 

 tendency. 



