252 NORTH AMERICAN OEDIPODINAE (ORTHOPTERA; ACRIDIDAE) 



and axillary fields regular, close, relatively small, the areolae in general quad- 

 rate, proximad the cross- veins are very close and much more numerous than 

 in A. caeruleipennis. 



Interspace between the mesosternal lobes quadrate, slightly transverse, 

 the margin of the lobes rounded meso-caudad: interspace between the meta- 

 sternal lobes moderately transverse, faintly narrower than the mesosternal 

 interspace. Ovipositor jaws relatively heavy, subcompressed, little recurved, 

 jaws blunted. 



Cephalic and median limbs of medium length. Caudal femora of average 

 form, in length slightly more than half the length of the tegmen, greatest depth 

 contained three and three-quarters times in the greatest length; lamellation of 

 dorsal carina weakly indicated in proximal half; external pagina regularly and 

 sharply pictured : caudal tibiae slightly shorter than the caudal femora, armed 

 on the external margin with eight to nine spines, on internal margin with ten 

 to eleven spines, the internal spines slightly longer than external spines, the 

 internal spines appreciably curved: caudal tarsi short, metatarsus subequaJ 

 in length to the remaining tarsal joints. 



Allohjpe. — cf ; El Paso, El Paso County, Texas. Elevation, 

 4200 feet. July 11, 1907. (Rehn and Hebard; edge of mesa.) 

 [Hebard Collection.] 



Description of Allotype. — Differing from the description of the female in the 

 following noteworthy features. Size relatively and proportionately small: 

 form more slender than in female sex. Fastigium slightly more longitudinal 

 than in female, excavation of fastigium and prominence of median carina more 

 evident than in female sex; frontal costa of the general type of the female but 

 narrower, with the constriction subobsolete, sulcation distinct, quite deep and 

 continuous from fastigium to a short distance dorsad of the clypeal suture: 

 width across eyes very distinctly greater than that across genae, the latter 

 nearly vertical. Eyes large, very prominent, the depth equal to one and one- 

 half times that of the infra-ocular sulcus. Antemiae slightly longer than the 

 length of the head and pronotum, very faintly enlarged distad. Tegmina 

 surpassing the apex of the abdomen l)y slightly more than the combined length 

 of the head and pronotum, greatest width of tegmen contained nearlj- six times 

 in greatest length of same, width of tegmen at distal margin about half that at 

 point of greatest width. Wings with the greatest width contained twice in the 

 greatest length of the same. Interspace between the mesosternal lobes 

 quadrate, faintly transverse: interspace between the metasternal lobes 

 quadrato-cuneate. Caudal tibiae with nine external and ten internal spines. 



General color tilleul-buff to vinaceoas-lniff, occasionally with head and 

 thorax, as well as proximal portion of the tegmina, but all to variable degrees, 

 washed with very weak chamois to cinnamon-bui^, the face frequentlj- 

 nearly hoary white. Venter and abdomen largely hoary white in individuals 

 not discolored, dorsal surface of abdomen washed proximad with orient blue 

 and deep orient blue to porcelain blue, this variable in depth and always 

 extending distad as a thread for a considerable distance along the dorsal carina 

 of the abdomen. Eyes ochraceous-bulT to buckthorn l)rown. Antennae 



