BLACKBURN AND SHARP—On some New Species and Genera of Coleoptera. 198 
scarcely at all flattened, and the apical asperities (though not so large, yet) more 
numerous, and running in rows. From X. frigidus, mihi, it differs in form (being 
much wider), and in having the rows of punctures on the elytra (as in X. trun- 
catus and X. immaturus) placed in evident though not well defined striz. 
A single specimen was taken on Oahu, but the exact particulars of the capture have been lost. 
TSBs 
Xyleborus insularis, n. sp.—Rufescens, elytris piceo-rufis, antennis pedibusque 
testaceis, thorace anterius crebre rugoso, posterius levigato; elytris seriatim 
punctatis, apice oblique declivo tuberculis duobus conspicuis munito, ante eas 
tuberculis plurimis minoribus. Long. 38 m.m. 
Closely allied to X. truncatus, but rather larger, and with the apex of the elytra 
less abruptly truncate, and more conspicuously armed. The retuse portion has its 
surface a little uneven; and near the suture, just before the middle, there is on each 
side a rather large tubercle. Just before, and at the commencement of, the trunca- 
tion there are six or eight smaller tubercles, irregularly placed, and at the sides 
there are a few quite minute tubercles. 
Oahu and Kauai. 
Das: 
Xyleborus immaturus, n. sp.—Nitidus ; subcylindricus; ferrugineus, ore nigri- 
cante ; setulis sparsim vestitus ; prothorace antice asperato, postice subnitido sparsim 
subtilissime punctato; elytris subtiliter subseriatim punctatis, postice obscure 
declivibus, parte declivi asperula parva triseriatim ferenti. Long. 23—3 m.m. 
I have specimens of this insect from widely separated localities. They all have 
an immature appearance, but I think this is due only to the paleness of the colour. 
X. immaturus is allied to X. truncatus, Sh., but has the elytra much less abruptly 
sloped behind, with the apical portion hardly at all flattened. It is decidedly more 
setulose than X. truncatus, and the apical asperities are much more strongly 
developed, and are placed in three longitudinal series on each of the elytra. There 
are indications of some of the rows-of-punetures (which are very fine) being in 
obsolete striz. 
This species has occurred in dead branches of trees on the mountains of Oahu, at an elevation of 
about 2000 feet ; also on Hawaii. 
abs 15}, 
Xyleborus frigidus, n. sp.—Angustus; cylindricus; piceo-niger, prothorace 
refuscente, antennis pedibusque testaceis; setulis brevibus sparsim vestitus; pro- 
thorace antice asperato, postice subnitido obsolete punctato; elytris subnitidis 
subtilissime seriatim punctatis, postice obscure declivibus, parte declivi asperula 
minuta subaqualia triseriatim ferenti. Long. 2} m.m. 
2D 2 
