1904.] NATURAL SCIENCES OF PHILADELPHIA, "^^ 565 



distinctly silicate below the ocellus; antennse somewhat shorter than 

 the head and pronotum. Median carina of the pronotum lower than in 

 the male; posterior margin of the pronotmii rectangulate with the 

 apex rounded. Intervals between the metastcrnal lobes verj^ slightly- 

 broader than long. 



General color blackish-brown, sprinkled with small obscure blackish 

 maculations. Abdomen and under surface dull yellowish in the male, 

 varying from yelloT\ish-brown to dark wood-brown in the females, and 

 the paler specimens of the latter sex have the abdomen with regular 

 lateral blotches of brownish-black. Tegmina of the general color. 

 Wings with the disk flame-scarlet, the fuscous bar rather dark but 

 fading on the posterior margin of the wing ; apex suffused with fuscous ; 

 taenia rather broad, solid, but not reaching the base of the wing; costal 

 margin of the color of the disk. Posterior femora externally with 

 traces of several transverse dark bars, the apical one of which is fairly 

 apparent and somewhat contrasts a weak pregenicular annulus of 

 ochraceous; genicular region blackish; internal face with the pre- 

 genicular annulus yellowish and distinct, the remainder black with 

 the superior and inferior margins cut by two broken bars of yellowish. 

 Posterior tibise greenish-yellow {o") or dull brown, dark apically; 

 spines tipped with black. 



Measurements. 



Length of body, 24 mm. 27 mm. 



Length of pronotum, 6 " 6 " 



Greatest width of pronotum, 4.1 " 4.5 " 



Length of tegmina, 24 " 26.5 " 



Greatest \sadth of tegmina, 5 " 5.5 " 



Length of wdng, 19.5 " 23 " 



Length of posterior femora, 13.7 " 14.2 " 



The series of this species examined comprises twelve specimens 

 from the following localities: Salt Lake City, Utah (three males); 

 Silver Lake, Utah [Skinner] (two males); Albuquerque, New Mexico 

 [Oslar] (two females); Jerome, Arizona [Oslar] (three males and two 

 females). The most striking variation exliibited by the series is in 

 color, size being quite constant. The ground color in some individuals 

 is almost uniform, in others strongly maculate, while several have the 

 posterior margin and the entire lateral lobes of the pronotum conspicu- 

 ously barred with the two primary shades. In several specimens the 

 axillary field of the tegmina is straw-colored, while a great amount of 

 variation is exhibited in the intensity of the external bars of the 



