f)!) 



iTIES©P.*!>, Sew. 



Body small, slender, cylindrical. Head elongate, produced in front into 

 a cone or pyramid ; vertex generally flat and horizontal in front of the eyes ; 

 face very oblique. Eyes not very prominent, sometimes transverse, and placed 

 midway between the antennae and pronotum ; but in the United States spe- 

 cies these are oblique and placed well forward. Antennae ensiform, prismatic 

 or flattened, about as long as the head and thorax. Pronotum short, cylindri- 

 cal ; lateral carinse obsolete ; median carina feeble. Anterior and middle 

 legs quite short ; posterior legs long and slender, the femora but slightly en- 

 larged at the base and slightly bent. Prosternum spined. Mesosternum and 

 metasternum usually more or less channeled. Elytra (when present) straight, 

 narrow, and usually shorter than the abdomen ; wings as long as the elytra. 

 Abdomen long and cylindrical. Sub-anal plate of the male elongate and 

 lanceolate. 



I have slightly modified Serville's generic description, which is controlled 

 too much by the position of the eyes. The short anterior and middle legs, 

 slender cylindrical body, and lanceolate sub-anal plate of the male should 

 separate such species from Opomala. By the slight modification here made, 

 this genus can receive those species which agree in every other respect save 

 the position of the eyes, and thus prevent the necessity of forming several 

 genera. 



M. wyomiu^en!i)i!!i, Thos., Proc. Acad. Nat. Sci. Phil., 1871. 

 Syn., Opomala wyomingensis, Thos., Geol. Siirv. Ter. 1871, 41G. 



Small, slender, and cylindrical ; elytra reaching the fifth abdominal seg- 

 ment; sub-anal plate of the male prolonged, lanceolate. Pale green, some- 

 times tinged with red, unspotted. 



Female. — Frontal cone elongate, pointed, flat above, scarcely margined ; 

 a shallow foveola each side under the lateral margin. Face very oblique, 

 quadricarinate ; carin^e sharp, divergent, reaching the clypeus. Eyes oblong- 

 ovate, situated near the antennae. Antennae ensiform, triquetrous. Pronotum 

 about as long as the head, truncate anteriorly and posteriorly, cylindrical. 

 Elytra narrow, lanceolate, reaching the fifth segment ; wings small, pellucid. 

 Abdomen cylindrical, elongate, sliglitly enlarged toward the ap^x ; upper cor- 

 niculi of the ovipositor scarcely exserted. Prosternal spine quite short and 

 blunt. Mesosternum slightly furrowed longitudinally on each side. 



