1870] 119 
Crown, posterior margin angulate emarginate. 
Ocelli 3. 
Scutellum with five longitudinal keels. 
Genus 1.—OLIARUS, Stal. 
Crown, posterior margin concave. 
Ocelli 2. 
Scutellum with three longitudinal keels. 
Genus 2.—CIXIUS, Lat. 
Genus 1.—Oriarvs, Stal. 
Head: crown frequently longer than broad, widest at the base, deeply concave, and 
with a more or less distinct middle keel, frequently not reaching to the convex 
anterior margin; forehead small, composed of two triangular pieces separated 
by a middle keel. Face dilated, with three longitudinal keels, lateral margins 
rounded. Clypeus large, separated from the face by an angular suture, and 
with a distinct middle keel. Ocelli 3, placed as follows, viz.:—two close to 
the margin of the face near the lower margin of the eyes, and one at the apex 
of the middle keel of the face. 
Thorax: pronotum very small; posterior margin deeply angulate in the middle and 
rounded off towards the posterior angles; central keel very short, side keels 
semi-circular, generally just beyond the posterior margin of the eyes, and 
running parallel with them. Scutelluwm with five longitudinal keels. 
Elytra without bands or spots. 
A.—Crown longer than broad ........... 1. pallidus. 
B.—Crown transverse... ................06+0.2. leporinus. 
A.—Crown longer than broad. 
Species 1.—OLIARUS PALLIDUS. 
Flata pallida, H. Schf., D. I., 154, 4. 
Pentastiridius pallens, Kirschb., Cicad., 45, 9 (1868). 
Elytra transparent, pale yellowish, nerves pale brownish-yellow, 
minutely, but somewhat indistinctly, granulated. 
Head black; crown longer than broad, marginal keels brownish-yellow, middle 
keel black, rather indistinct, not reaching to the anterior margin. Face and 
clypeus keels brownish-yellow. Antenne, 2nd joint brown. 
Thoraw: pronotum black, keels and posterior margin yellow or yellowish-white. 
Scutellum black, side margins and apex narrowly brown; keels black, or 
sometimes piceous, the 2nd and 4th keels slightly diverge for about two-thirds 
their length from the base, where they then contract towards the apex. 
Elytra transparent, very pale yellowish, nerves minutely but somewhat in- 
distinctly granulated, pale brownish-yellow as far as the transverse nerves, 
from thence to the apex brown; marginal nerve not granulated, but round 
the apex, on the inside, narrowly margined with brown; the cuneate patch 
adjoining the anterior margin more or less brown interiorly. Wings clear and 
