83 



quite oblique, arcuate ; frontal costa broad, expanding below, not sulcate, 

 but slightly depressed at the ocellus; lateral carinse distinct, diverging 

 rapidly ; eacli side of the frontal costa there is a curved impression. Eyes 

 ovate, oblique, acuminate above. Pronotum same length as the head, trun- 

 cate, in front, and obtusely rounded behind, sub-cylindrical, sub-tricarinate, 

 the three carinas being very slight, close together, and parallel ; the pos- 

 terior transverse sulcus a little behind the middle, it alone cuts the median 

 carina. Antennae somewhat flattened, not longer than the head and 

 thorax. Elytra narrow, a little longer than the abdomen ; wings nearly 

 same length Abdominal appendages of the female very short, the upper 

 valves not passing the last abdominal segment; sub-anal plate of the male 

 triangular, entire at the tip. The lateral carinse of the pronotum in the male 

 are very indistinct and farther apart than in the female ; in each sex these 

 are but mere threads, not aifecting the sub-cylindrical shape of the protho- 

 rax. Posterior femora about as long as the abdomen. 



Color (dried after immersion in alcohol). — Parts of the mouth, venter, 

 and sternum pale-yellow ; face dull-yellow ; eyes brown. Two very regular 

 brown stripes, starting from the tip of the vertex (one from each side near 

 the upper angle of the eye), gradually enlai'ging, run along the sides of the 

 head and pronotum, and along the central part of the elytra to the tip. The 

 intermediate stripe along the dorsum and the space on the sides below the 

 brown stripes are dull-yellow. An obscure, brownish band extends obliquely 

 downward and backward from each eye, and a more distinct stripe of the 

 same color marks the lower part of the sides of the pronotum, generally 

 bordered by narrow but distinct yellow lines. Wings pellucid, the nervules 

 near the apex dusky, the rest ocherous. Posterior femora with three dark 

 bands. When living the posterior tibiae are blue, but after long immersion 

 in alcohol they change to a dull-yellow; spines black at the tips. Anterior 

 legs pale-brown. The brown markings are often tinged with a lilac shade. 



Dimensions. — s Length, 0.81 to 0.90 inch; elytra, 0.65 inch; posterior 

 femora, 0.52 inch. 3 Length, 0.62 inch; elytra, 0.60 inch. 



Var. unicolor — The median or dorsal space brownish, which, uniting 

 with the brownish stripes, gives the entire back a brownish color. 



Hab. — Colorado and Wyoming (Thomas). Var. unicolor found near 

 Fort Fetterman, Wyoming Territory. 



Remark — This species approaches very near to EjMcromia, and is closely 

 allied to St. ejmcromoides, Walk 



