358 NEW NORTH AMERICAN MELANOPLI (ORTHOPTERA) 



Oedaleonotus borckii orientis new subspecies (Plate XVI, fig. 1.) 



This geographic race is at present known only from the higher 

 portions of southern and northeastern Nevada. Westward its 

 limit of distribution certainly occurs before the Sierran uplift is 

 reached, as in that region borckii pacificus (Scudder) is found. 6 



We find borckii orientis to be very close to typical borckii, 

 though not as close as borckii pacificus. It differs in the average 

 smaller size, more grayish general coloration, proportionately 

 wider interval between the tegmina of both sexes and caudal 

 femora with internal and ventral surfaces yellow, showing no 

 tinge of orange. 



Like typical borckii, the present race differs from borckii pacifi- 

 cus in having the lateral bands of the pronotum weak or sub- 

 obsolete on the metazonal portion of the lateral lobes. Though 

 variable in intensity in all the races of this species, these bands 

 are normally percurrent and much the heaviest in borckii pacificus, 

 this feature being indeed the best one to distinguish that very 

 weakly defined race from typical borckii. 



Type. — cf ; Lee Canyon, Spring Mountains, Clark County, 

 Nevada. Elevation, 7000 feet. August 19, 1919. (Rehn and 

 Hebard.) [Hebard Collection, Type no. 552.] 



Size medium small for the genus, averaging smaller than in typical borckii, 

 though no smaller than the average- in borckii pacificus from the southern 

 Sierras; form medium for the genus. Head and pronotum as in borckii 

 borckii. Pronotum with medio-longitudinal carina well developed cephalad 

 and caudad of the decided transverse sulci, subobsolete between these; 

 lateral carinae weak, showing slight divergence caudad; caudal margin of 

 disk very weakly obtuse-angulate produced. Tegmina elongate oval, sep- 

 arated by a marked interspace (.9 to 1.2 mm. in the type and series of para- 

 typic males 7 ). Genitalia as in borckii borckii, the furcula very small, the 

 cerci very slender and incurved distad. Prosternal spine short and sharply 

 conical. Important features are noted in the color description. 



6 Study of the extensive series now at hand shows Scudder's Melanoplus 

 pacificus to be a very weakly defined geographic race of Stal's Acridium 

 (Podisma) borckii. 



7 This is subject to further variation, as the two Crestline and Ruby Range 

 males before us have the tegmina broad oval and separated by an interspace 

 .5 mm. in width. In males of the other races of borckii the tegmina usually 

 slightly overlap or are attingent, in rare cases separated by an interspace, 

 the maximum in the series before us being .6 mm. in width, in individuals of 

 much larger size than those of borckii orientis. 



