156  Buackpurn and SHarp—On some New Species and Genera of Coleoptera. 
Besides the Hlateride described above, I possess fragments of a robust-looking 
insect belonging to the family, of about the same size as Itodacnus gracilis, Sh., 
having black elytra, on each of which there are a number of small yellow spots, 
arranged in three irregular transyerse fasciee. These fragments were dug out of 
the trunk of a species of Acacia, at an elevation of about 2000 feet on the moun- 
tains of Oahu. 
AU 18%, 
Iropacnus (noy. gen.). 
A new genus must be established for an insect allied to Corymbites, but 
with the lamina of the hind coxa strongly produced over the trochanter 
so as to form an angle, as in Eopenthes; from this later genus Itodacnus 
differs, by the front of the head being flat in the middle, so as to be continuous 
with the labrum, and by the elongate third joint of the antennz. The facies is 
that of many species of Athous. The prosternal sutures are scarcely impressed in 
front, and the prosternal process is without an angle on its lower face; the posterior 
portion of the mesosternal cavity is a little oblique, but does not differ much in 
direction from the anterior portion. The tarsi are elongate and slender, and 
linear, with simple claws; the hind foot is quite as long as the tibia, and its basal 
joint is elongate, nearly as long as the three following joints together. Corym- 
bites corruscus, Karsch, Berl. Ent. Zeit. xxv. p. 5, pl. 1. f£. 6, probably belongs to 
the genus. 
D.S. 
Itodacnus gracilis, n. sp.—Elongatus, parum convexus, fuscus, supra brunneus, 
prothorace obscuriore basi pallido, antennis pedibusque testaceis, tenuiter pubes- 
cens, sat nitidus; prothorace crebre sat fortiter punctato; elytris haud profunde 
striatis, striis punctatis ; interstitiis crebre punctatis. Long. 12m.m. (Plate Iv., 
f, 18:) 
Antenne slender, reaching farther back than the hind angles of the thorax ; 
second joint short, but not globular; third twice as long as second; fourth and 
following joints slender, not serrate internally ; terminal joints simple; head and 
prothorax darker in colour than the elytra, but the base of the thorax is a good 
deal paler ; its sides are not sinuate ; the apices of the elytra are not acuminate. 
I have a pair of this species before me; the antennz and legs of the male 
appear to be more elongate than those of the female, but in other respects the two 
agree. 
This species is found rarely by beating and sweeping on both the mountain ranges of Oahu, at an 
elevation of about 2000 feet. No. 821 of Mr. Blackburn. 
DRS: 
