106 PROCEEDINGS OF THE ACADEMY OF [March, 



and pronounced than in that from other regions, while the ten- 

 dency is infrequent or almost absent in atypical or intermediate 

 (M. m. rnaculipennisxM. m. macclungi) individuals. This exten- 

 sion is always narrower on the prozona than on the metazona, 

 and occasionally is very broad on the latter section, leaving the 

 pale coloration as a narrow median line, which may or may not 

 be pencilled with a median dark line. Rarely the blackish on 

 the metazona is pronounced only at its inner margin, and is almost 

 separated from the lateral bars, thus forming additional longi- 

 tudinal clashes of dark color. Very rarely the postocular bars 

 are subobsolete on the metazona. The width of the actual post- 

 ocular bars and their solidity are variable entirely independent 

 of the extension of the bars, the former feature in both sexes, the 

 latter in the female alone, the bars being invariably solid in the 

 male sex. 



Oblique infra-ocular stripes on the gense are rarely indicated, 

 never complete or solid. A pale area is generally present in the 

 axillary field of the tegmina, and this is of variable width, occa- 

 sionally dark along the sutural margin, producing a dark median 

 line on the closed tegmina. The tegmina of the female in typical 

 southern and central Texas material, and north Texas atypical 

 material, is generally maculate to a greater or lesser degree; in 

 material from west of those regions rarely maculate. In the male 

 sex the tegmina are never more than weakly maculate. 



One male (base of Mount Sheridan, Oklahoma) has a combina- 

 tion of complete broad dorsal bar and strong lateral bars, which 

 greatly suggests M. iexana. 



In general tonal depth the central and south Texas material 

 is strongly intensive, that from north Texas localities slightly 

 weaker, the west Texas specimens and those from the Mesilla 

 region. New Mexico, paler and more grayish overcast, the Albu- 

 querque series very dull and dark, the few Arizona and Nevada 

 specimens brilliant and clear, with light yellow and green tones. 



The general pale color in the male ranges from straw yellow, 

 through barium yellow and amber yellow, light chalcedony yellow, 

 chalcedony yellow to light green-yellow; in the female from light 

 ochraceous-buff, through light ochraceous-salmon, light pinkish 

 cinnamon, dull zinc orange to tawny on one hand; and through 

 ochraceous-buff, barium yellow, mustard yellow to primuline 

 yellow on the other hand. The dark pattern varies from bone 

 brown to blackish brown. The shade of the caudal tibial color 



