60 



Color (after immersion in alcohol). — Pale greenish-yellow, immaculate ; 

 a bright pea-green when living. 



Male. — Differs from the female as follows : Much smaller and slenderer. 

 Vertex more pointed ; slightly margined. Abdomen turned up at the apex, 

 terminating with a sharp lanceolate extension of the last ventral segment. 

 Antenna?, face, vertex, occiput, pronotum, posterior femora, and abdominal 

 appendages pale carneous ; a whitish stripe extends from the lower border of 

 the eye to the base of the middle legs. Intermediate varieties arc common. 



Dimensions. — 9 Length, 1.05 inches ; elytra, 0.52 inch ; posterior femora, 

 5 inch. $ Length, 78 inch. 



Wyoming Territory (Thomas). Figured, Glover, Ills. Am. Ent. Orth., 

 PI. xi, Fig. 8. 



M. chBoi'izans. 



Syn., Stenacris chlorizans, Walk., Oijt. Dermap. Salt., IV, 652. 



Opomala mexicana (?), Sauss., Eev. et Mag. Zool., XIII, 1861, 156. 



3Iale. — Very similar in form and size to Opomala fasciculata, Charp. 

 Vertex very narrow between the eyes ; suddenly expanding in advance of 

 these, triangular in front, the part in advance of the eyes is horizontal and 

 slightly rugulose, the part between the eyes roundly deflexed, thus forming 

 a kind of transverse indentation between the two . parts. The face very 

 oblique ; the frontal costa prominent between the antenna?, but below this 

 deeply sulcate, forming two slender but not prominent carinse ; lateral carinse 

 minute. Antennis slightly enlarged near the base, not much flattened, 

 minutely and thickly punctate throughout — but a moderate magnifier is 

 required to see these distinctly — about as long as the head and thorax. Pro- 

 notum cylindrical, without carinse, thickly punctate ; the three transverse 

 impressions somewhat distinct, the second is situated about the middle of the 

 pronotum ; posterior lobe obtusely rounded ; sides of the mesothorax and 

 metathorax thickly punctured. Elytra very narrow, extending beyond the 

 tip of the abdomen, slightly curved up at the apex ; wings a little shorter 

 than the elytra. Posterior femora much shorter than the elytra, and a little 

 shorter than the abdomen ; the disk convex ; the pinnae and median sulcus 

 almost obliterated; terminal joint of the posterior tarsi very long and slender. 

 Super-anal plate subquadrate, with a Hat, blunt tooth at the apex; sub-anal 

 plate ver}' long, with a j^mall tootli each si(l(' at ll)e ap(;x, and tlie middle 



