% 
117 
/ rm 
Genus Epirgponota. 
Erireponota nugosa. pip. atra, opaca: capite rugoso ; thorace 
lato plusquam longo, postice angustiore, depresso superne: rugis 
valde irregularibus, illis apud marginem eateriorem plerimque lon- 
gitudinalibus, illis apud discum feré transversis, et utringue costd 
majore sublongitudinali definitis ; elytris subovatis undatim rugis 
pleriimque transversis, et utringue costd apud discum valdé ele- 
vatd, deindé alterd minus elevatd inter illam et carinam lateralem. 
Long. corp. 83 lin.; lat. 33 lin. ; vel, long. 114; lat. 53. 
Hab. Petorca? 
The whole upper surface of this insect is covered with well-marked 
irregular ruge ; these are for the most part longitudinal in their di- 
rection: on the clypeus, and there is a transverse indentation marking 
the posterior boundary of this part: a little behind the line of the 
eyes is a somewhat irregular transverse ridge, and in the middle, be- 
tween this ridge and the transverse groove just mentioned, is a short 
longitudinal ridge. The labrum is rugosely punctured. The thorax 
is very nearly twice as broad as long; its anterior and posterior 
margins are nearly straight, excepting near the lateral angles, which 
are produced. Besides the ordinary ruge on the thorax, there are 
two large longitudinal and slightly curved ridges, situated one on 
each side, nearly midway between the mesial line and the outer 
margin; and on each elytron is a strongly elevated costa or ridge, 
extending from the base very nearly to the apex, and running nearly 
parallel with the lateral keel of the elytron, on the mesial line of 
which they are placed. The spaces between these coste is some- 
what concave, and so is the interstice of the costa and the lateral 
keel of the elytron, which is crenulated or irregularly indented. ‘The 
mentum is very coarsely punctured, and the punctures are confluent. 
The under side of the head is punctured, and there are numerous 
coarse punctures on the prosternum between the legs. The basal 
segments of the abdomen have small longitudinal sulci beneath. 
Besides the great difference in size and form indicated by the di- 
mensions, there occurs sometimes a difference in the sculpturing of 
the thorax and elytra, which I could scarcely have believed to exist 
in the same species had I not had an opportunity of examining many 
specimens. .In a specimen before me, the ruge on the head, tho- 
rax and elytra are much less distinct than in the individuals from 
which the above description is taken ; and this is combined with a 
convexity of the elytra (which are almost always concave between 
the two dorsal coste and also between these coste and the lateral 
keel), giving a very different aspect to the specimen under consi- 
deration. 
In having the thorax distinctly contracted behind, and in the more 
truly moniliform structure of the antennz, the present imsect ap- 
proaches more nearly to Callyntra than to Epipedonota, but the ter- 
minal joint of the antenne is decidedly smaller than the rest. I have 
before me specimens of the Callyntra multicostata and Call. vicina 
(which I scarcely think a distinct species), and do not find so marked 
