138 PROCEEDINGS OF THE ACADEMY OF [Feb. r 



that the males have the tegmina reaching or slightly exceeding the 

 apex of the abdomen, while the females possess tegmina much over 

 half as long as the abdomen, in all of that sex failing to reach the apices 

 of the caudal femora by less than the length of the pronotum. The 

 apices of the tegmina are more or less narrowly rounded in all the 

 specimens. On examining a number of representatives of the Great 

 Plains 0. obscura, which it may be added has a considerable amount 

 of variation in the tegminal length, it is noticed that individuals with 

 rather short tegmina have the tips of the same pointed, while those 

 with longer tegmina have the same portions rounded. This is true of 

 almost all of a number of individuals of the species, and no doubt 

 explains the presence of rounded apices to the tegmina in the long- 

 winged Spofford and Dunlay individuals. 



To the characters given by Bruner for separating Opeia imperfecta 

 from 0. obscura might be added the less inflated character of the head 

 in imperfecta with the resultant straighter and less arcuate occiput. 



This species was described from southwestern Texas and Jimulco 

 and Comancho, Zacatecas, Mexico. 



AMPHITOKNUS McNeill. 

 Amphitornus ornatus McNeill. 



On a desert hillside and on grassy prairie at Aden this species was 

 found rather numerous on July 21, three individuals of each sex being 

 taken. At an elevation of 5,300 feet in the pinon and juniper zone of 

 Dry Canyon, Sacramento Mountains, a single male was taken, July 13, 

 on bare ground among low bushes on the steep canyon wall. At 

 both localities the species was found to be exceedingly wary and diffi- 

 cult to capture. The only previous New Mexican record of the species 

 was of its capture at Little Mountain, east of Mesilla Park, Donna Ana 

 County, on July 1. 



CORDILLACRIS Rehn. 

 Cordillacris occipitalis (Thomas). 



On the grassy rolling prairie at Aden this species was found fairly 

 plentiful on July 21, a series of fifteen males and ten females being 

 taken. A female of the species was also taken during a train stop at 

 Faywood, Luna County, New Mexico, on July 20. 



An appreciable amount of variation in size is noticeable in both 

 sexes, but particularly in the male, while the general tone of the basic 

 coloration varies from a predominating ochre type to one with gray- 

 brown the main element, with, however, one specimen decidedly brick 

 red in general tone. 



