156 NORTH AMERICAN MELANOPLI (ORTHOPTERA) 



ject to much plasticity. Similar in many features, other char- 

 acters show them to be definitely distinct. 



Type. — $ ; Ridge northwest of Helicopter Peak, Mount Gra- 

 ham, Pinaleno Mountains, Arizona. Elevation 9700 feet. August 

 21, 1934. (E. D. Ball). [Hebard Collection, Type no. 1309]. 



Size slightly below medium, form normal for the group. Vertex and 

 frontal costa as in magdalenae. Pronotum with medio-longitudinal carina 

 almost obsolete on prozona, fine and percurrent on metazona, caudal margin 

 of dorsum showing very faint convexity. Prosternal spine comparatively 

 short, shorter even than in magdalenae, its apex moderately transverse and 

 bluntly rounded. Elongate ovate tegminal pads considerably shorter than 

 pronotum, separated by a very considerable interval. Apex of abdomen 

 moderately enlarged. Furcula represented by very small blunt triangular 

 projections, no longer than basal width. Supra-anal plate triangular, basal 

 width equal to length, lateral margins very feebly convex, convergent, 

 medio-longitudinal sulcus deep in proximal two-fifths and moderately deep 

 distad, lateral portions with surface moderately concave. Cercus of same 

 general type as in magdalenae but more slender, fully twice as long as 

 proximal width, external surface moderately swollen except the flattened 

 tip, lateral margins very faintly convergent in proximal three-fifths, thence 

 more strongly convergent in apical portion which is directed dorso-caudad 

 with apex broadly rounded. Penis a moderately broad erect shaft, with 

 margins meeting ventro-caudad to form a narrow V-emargination ; proxi- 

 mal processes large, delicately cochleate, distad curving inward so that their 

 acute apices are attingent; succeeding processes very slender, erect, almost 

 concealed along inner margins of proximal processes and not as much pro- 

 duced. Subgenital plate convex with a very prominent blunt apical tubercle. 



Allotype. — 9 ; same data as type. [Hebard Collection]. 



Larger and more robust than male. Pronotum with medio-longitudinal 

 carina very faintly indicated on prozona, fine but distinct on metazona. 

 Prosternal spine much as in male but with apex less transverse. Tegminal 

 pads similar to those of male but even more widely separated. Ovipositor 

 valves moderately elongate, much as in this sex of chiricahuae. 



Measurements. — The measurements of a paratypic male, bearing the 

 same data (a moderately large immature male is also before me), follow 

 those of the type. Length of body $ (prior to extrusion of penis) 17. 

 and 17., 9 18.2; length of pronotum $ 4. and 3.9, 9 4.4; caudal width 

 of pronotal disk $ 2.7 and 2.8, 9 3.7; length of tegmen $ 3.5 (estimated, 

 damaged) and 2.9 (2.6 on other side), 9 3.7; greatest width of tegmen 

 8 1.6 and 1.8, 9 2.; length of caudal femur $ 9.7 and 9.5, 9 10.9 mm. 



Coloration. — General coloration of male brown, postocular bar broad, 

 broadening very extensively on the pronotal lateral lobes and leaving only 

 a narrow ventral portion paler, but terminating just caudad of the prin- 



