140 PROCEEDINGS OF THE ACADEMY OF [Feb., 



originally placed Silver City among his localities for crenulata. The 

 description of crenulata was dissected and tabulated in parallel columns 

 of agreement with the two species in hand, but no definite conclusion 

 could be reached, so in response to an inquiry Prof. Brunei' wrote as 

 follows: "The insect called Cordillacris crenulata was described chiefly 

 from west Nebraska specimens, although I had at the time other 

 specimens from New Mexico in my collection." In view of this state- 

 ment it seems perfectly legitimate to consider the northern form, 

 which we have before us from McCook and Sioux Counties, Nebraska, 

 and Antonito, Rocky Ford, Colorado Springs and Fort Collins, Colorado, 

 as the true crenulata. 



Size medium; form rather similar to that of C. crenulata. 

 Head with its dorsal length subequal to that of the pronotum, 

 moderately but regularly ascending to the fastigium when seen 

 from the side, the fastigium slightly descending; interocular region 

 very slightly ( cT ) or not at all (?) narrower than one of the eyes ; 

 fastigium with the apical angle rectangulate in both sexes, the disk 

 very slightly depressed immediately caudad of the margin; fastigio- 

 facial angle subrectangulate when seen from the side, face greatly 

 ( c? ) or considerably ( 9 ) retreating ; ventral portion of the head 

 moderately inflated, not at all ( cT ) or slightly ( 9 ) broader than the 



Fig. 10. — Cordillacris apache n. sp. Lateral view of female type. (X 3.) 



width across the eyes ; frontal costa very narrow and subequal dorsad, 

 regularly and considerably expanding ventrad of the antennae, sulca- 

 tion deep dorsad, being very shallow and subobsolete ventrad. Eyes 

 subovate ( c? ) or subtrigonal-ovate (?) in outline, moderately prominent 

 in both sexes when seen from the dorsum, the length subequal to ( 9 ) or 

 very slightly exceeding ( c? ) the infra-ocular sulcus ; antennae slightly ( c? ) 

 or considerably ( 9 ) exceeding the length of the head and pronotum 

 together, slightly depressed, with a slight ensif orm tendency in the female, 

 apex rather blunt. Pronotum very slightly sellate; cephalic margin of 

 the dorsum slightly emarginate truncate, caudal margin slightly arcuate 

 (cT) or arcuato-truncate ( 9 ); median carina low and weak, most ap- 



