ISCHNOCERUS. 305 
Ill. ISCHNOCERUS. 
Ischnocerus, Schoenherr, Gen. Spec. Cure. v. p. 191 (1839) (type: infuscatus); Lac. Gen. Col. 
vii. p. 505 (1866). 
Meconemus, Labram and Imhoff, Gen. Cure. i. no. 40 (1842) (type: tuberculatus =infuscatus) . 
Range: South and Central America. 
$ 9. Rostrum more or less cylindrical, widened at apex, with a mesial carina on the upperside continued 
over the frons. Eye coarsely granulated, lateral, more or less distinctly longer than broad. Antenna 
very thin, with a broad club of three segments, 9 triangular, 10 transverse. Antebasal carina of pro- 
notum distant from base, flexed forward in an obtuse angle at the side, the lateral portion very oblique, 
not longitudinal, more or less curved, the posterior side being concave ; sub-basal carina thin, sometimes 
vestigial ; no basal lateral longitudinal carina. 
There is no other genus in the American fauna with which the present one could be 
confounded, except Dinocentrus, from Chili, which differs only slightly from Jschno- 
cerus, the antenna in the former being thicker, the antebasal carina of the prothorax 
more distant from the base, and the sub-basal carina having vanished altogether. The 
Ethiopian species which stand under Jschnocerus in the Munich Catalogue have no 
distinct mesial carina on the rostrum, their underlip is not quite so deeply divided as in 
the American insects, the eye is more finely granulated, and the antenna is less slender, 
the third segment, moreover, being obviously longer than the others. 
Four species are known from Central or South America, and five more are added 
here. 
a. Eye oblong; elytron with tubercles and tufts . . . . b. 
Eye oblong; elytron with black patch in middle of dise, no distinct 
tubercles. . . eee ee - oe. 6 « . « « Species No. 6. 
Eye practically round ; a white mesial line on head and pronotum . . Species No. 7. 
6. Longitudinal axis of eye shorter than the distance of eye from antenna, 
the rostrum being long, at least in the males; anterior edge of 
pronotum produced into a small but distinct tooth behind each eye . c. 
Distance of eye from antenna not surpassing length of eye; anterior 
edge of pronotum without tooth... 2. eee ee eee 
c. Carina of prothorax not interrupted in middle (or very narrowly) . . Species No. 1. 
Carina of prothorax rather widely interrupted in middle . . . . ~ Species No.2 
d. Pronotum not distinctly impressed on disc, with small mesial tuft . . Species No. 5. 
Pronotum distinctly impressed on disc, with large mesial tubercle, sides 
of impression alsoraised «6. ee 8 ee ee ee te 
e. Third interspace of elytron with four tu bercles. . . . . .. ff 
Third interspace of elytron with five tubercles, the second of which is 
small... . . . es «  [e@nescens, Jord. (1895); Paraguay and Brazil. | 
f. Third tubercle of third interspace of elytron only a little wider than the 
third interspace is before it . <; . : . Species No. 3. 
This tubercle twice as broad as the third interspace is before it, the third 
and fourth stripes of punctures curving laterad at the tubercle; derm 
of elytra strongly metallic . . 6 6 6 ee ee ee ee Species No. 4. 
