156 



OITHflATOl-AlMPIS, Biirm. 



This small genus, which belongs apparently to the western hemisphere 

 only, is at once easily distinguished by its semi-globose eyes, which are quite 

 prominent, and have a metallic luster. They extend fixr into the vertex* (top 

 of the head), and are situated so close together that only a small strip of the 

 vertex runs between them from the occiput to the short rhomboidal top 

 (vertex in front of the eyes) of the head, which has on it a longitudinal-im- 

 pressed line. The antennae are situated immediately adjoining the vertex ; 

 and the facial carina} are wanting here, which leaves the forehead tolerably 

 smooth. The antennas are filiform, rather long, and consist of 20-24 

 joints, somewhat flattened, especially *near the base. The pronotum is cyl- 

 indrical, without distinct carinse ; the transverse impressions distinct, the 

 posterior situated near the hind margin ; the posterior margin nearly straight, 

 very obtusely angled. Elytra narrow, generally opaque, closely netted, some- 

 times abbreviated, or altogether wanting in the female. Hind femora robust, 

 generally longer than the abdomen. The sexual organs of the male large ; 

 the terminal segment of the abdomen slightly enlarged. The prosternal 

 spine short, conical, pointed. 



O. viriflis, Thos. 



Syu., Galoptenus viridis, Thos., Geol. Surv. Terr., 1871, 450, PI. ii. Fig. 3. 

 Vertex sUghtly expanding in front of the eyes, channeled (in dried speci- 

 mens); when living, the part between the eyes presents a dim, hexagonal 

 outline, with a slight central depression ; frontal costa sulcate, and narrowed 

 below the ocellus, sides punctured; lateral carinas but slightly divergent- 

 Eyes elongate, large, acuminate above, and approaching unusually near to 

 each other. Pronotum sub-cylindrical ; lateral carinse obliterated ; median 

 carina scarcely perceptible ; slightly divergent posteriorly ; posterior margin 

 obtusely angled ; posterior lateral margins ascend somewhat obliquely, with a 

 very slight inward curve at the humerus ; the posterior transverse incision is 

 much behind the middle. Cerci of the male regularly acuminate ; sub-anal 

 plate with the margin entire, sub-truncate at the apex ; super-anal plate with 

 two sub-median convergent carinse. Elytra and wings about as long as the 

 abdomen. Posterior femora reach the tip of the abdomen. 



* Burmeister applies this term to the top of the head, and not to the front part 

 between the eyes, as I have usually done. 



