63 



the apex. Prosternum furnished with a transverse ridge. Sheaths of the 

 oviduct lanceolate. Legs slender. • . 



Dimensions. — Length, 1.4 inclies. 



United States (Walker). 



Walker places this species with doubt in Mesops, but the tricarinate 

 pronotuni certainly forbids it a place in that genus, notwithstanding the other 

 characters. I have, therefore, ventured to remove it to Opomala, although I 

 have seen no specimens. 



©. aptera, Scudd., Proc. Am. Ent. Soc, iP 305. 



Female. — Prolongation of the vertex equals the lengtli of the eye; sides 

 parallel; front rounded. Carinse of the pronotuni distinct, rather sharp. 

 Elytra slender, lanceolate, nearly abortive. Wings wanting. 



Color. — Head streaked with reddish testaceous and dull yellowish; 

 ujiper edge of the clypeus bordered with vvhitish; labrum and clypeus dotted 

 with fuscous; joints of the palpi blackish at base; antennae brown. Pro- 

 notuni, abdomen, and appendages brownish. 



Ditnensions. — Length, 1.4 inches ; antennse, 0.3 inch; posterior femora, 

 0.6 inch; elytra, 0.25 inch. 



Pennsylvania (Scudder). 



O. bra€hys»tera, '■ Scudd., Best. Jour. Nat. His., VII, 454. 



Vertex triangular; margins elevated ; a median carina. Face, with the 

 four caiinse distinct, divergent below, reaching the clypeus. Antennse scarcely 

 reaching the apex of the pronotuni. Sides and carinse of the pronotuni 

 parallel; posterior transverse impression distinct. Elytra about half as long 

 as the abdomen; wings very short. Abdomen slender, slightly keeled above. 

 Prosternal spine only a blunt protuberance. 



Color. — Brown; dotted faintly above with black. A faint dark stripe 

 extending from the lower border of each eye along the side of the pronotum. 

 Hind femora with a row of black dots on the upper edge; terminal lobe 



* This specific nfline has been used some two or three times in this genus. Acri- 

 (Uum brachi/pter^m, Haan (Ve.rz. Nat. Gesch. Ned. Ind. Bez. Ins., 1.50), has been trans- 

 ferred by Walker to this genus with this name, but Scudder's name, being the oldest, 

 talses precedence. I think Schaurn (?) has described a species from Madagascar under 

 this name, but I have no means of reference at present at hand to confirm this opinion 

 or ascertain the date. See also Gerst. Arch. Naturg., XXXV, 21G. 



