234 NORTH AMERICAN OEDIPODINAE (ORTHOPTERA; ACRIDIDAE) 



Type. — 9 ; Mason, Lyon County, Nevada. Elevation, 4500 

 feet. September 5, 1910. (Rehn and Hebard.) [Hebard 

 Collection, Type no. 493.] 



Description of Type. — Size relatively small: form robust, tegmina and wings 

 shorter and broader than usual in genus: surface dull; tegmina almost entirely 

 coriaceous, briefly subhyaline distad. 



Head relatively large, broad: occiput moderately elevated in profile, inter- 

 space between eyes dorsad subequal to transverse width of eye: fastigium 

 strongly and regularly arcuate declivent, broad, very shallowly arcuate- 

 excavate, lateral margins weakly but appreciably elevated, in outline subovoid, 

 greatest width ventro-cephalad, median carina distinct but very low: frontal 

 costa moderately broad (for genus), in general moderately expanding ventrad, 

 obsolete ventrad on face, margins bisinuate and constricted dorsad of the 

 insertion of the antennae and ventrad of the median ocellus, continuous with 

 fastigial margins; costa of moderate width at junction with fastigium, weakly 

 and incompletely sulcate, V-shaped impression at fastigial junction distinct, 

 acute: in profile fastigium regularly passes into facial outline, latter nearly 

 vertical, very weakly arcuate; interantennal projection slightly arcuate: width 

 of head across genae faintly less than that across eyes: eyes very prominent, 

 in basal outline nearly circular, slightly flattened dorsad, the depth very faintly 

 greater than that of the infra-ocular portion of the genae; from cephalic and 

 dorsal aspects the eyes are seen to be quite prominent : antennae slightly more 

 than three-fourths as long as caudal femora, slender. 



Pronotum broad and short, the greatest width across metazona of disk 

 subequal to greatest length, subsellate in form, surface largely rugulose, pale 

 areas on lateral lobes relatively smooth; transverse sulcus almost straight, 

 intersecting median carina at about middle: cephalic margin of disk arcuate 

 produced mesad; caudal margin of disk obtuse-angulate, the margin regularly 

 and evenly converging to the apex, which is very weakly rounded: median 

 carina low and carinulate cephalad on prozona, subarcuate in profile, obsolete 

 caudad on prozona, with the group of three tubercles found in some species of 

 the genus represented by low bosses on a transverse fold; median carina of 

 metazona delicately carinulate, low: surface of metazona with rugulosities to 

 some extent connected and erratic: lateral carinae not evident on prozona, 

 very weak but evident on the rounded metazonal humeral shoulders: lateral 

 lobes slightly deeper than broad; caudal margin gently arcuate from humeral 

 angle to the broadly arcuate ventro-caudal angle; surface of metazona of lol)es 

 cribroso-reticulose. 



Tegmina three times as long as head and dorsum of j)ronotuni combined, 

 broad proximad, their width there but slightly less than length of i)ronotum, 

 narrowed distad, the width at distal sixth subequal to length of metazona of 

 disk:, costal margin of tegmina straight from costal IoIjc to briefly proximad of 

 apex, i.e. point measured above, thence to rounded ai)ex arcuate; sutural mar- 

 gin straight in the greater portion of its length, the sutural and costal margins 

 moderately converging distad: anal field of tegmina relatively broad, prcjxiniad 



