158  Buackpurn anp SHarp—On some New Species and Genera of Coleoptera. 
a little narrowed behind them; thorax quite twice as broad as long, slightly 
narrower than the elytra, very little narrowed behind; sides, base and front 
nearly straight, everywhere strongly margined, except that in the middle in front 
the margin becomes more indistinct; elytra short, but more than twice as long as 
the thorax, not coadapted at the suture, but becoming divergent from one another 
just behind the scutellum. 
Found in Mr. Blackburn’s house at Honolulu; single specimens at wide intervals of time. No. 851. 
DAS: 
Fam. PTINIDA. 
XYLETOBIUS. 
Xyletobius (?) insignis, n. sp.—Angustus ; dense subtilissime tomentosus ; capite 
nigro, ore prothoraceque rufis; elytris piceis testaceo-variegatis subtiliter striatis, 
striis plus minusye sinuatis; antennis (toto corpore vix brevioribus), palpis, pedi- 
busque rufis; oculis permagnis. Long. 5 m.m. 
This insect so closely resembles X. lineatus, Sh., in some respects that I feel a 
slight misgiving as to whether the characters that seem to distinguish it may not 
be sexual; in which case, however, it would have to be considered probable that 
all the remainder of the specimens taken by me in the genus are of the same sex. 
If this be not the case it would appear doubtful whether the insect can be referred 
to this genus at all. It differs from X, lineatus as follows:—It is very much 
larger ; the antenne are very long (scarcely shorter than the whole body), are 
entirely of a pale red colour and hardly serrated, the joints being very slender 
and elongate; the eyes are very large and convex, extending the whole length of 
the head, and being together (viewed from the front) considerably wider than the 
space between them; the head is obscurely tricarinated longitudinally ; the apical 
dilatation of the tarsi is less defined. Iam not able to discover any other characters 
on which to separate this insect from X. lineatus, Sh. 
A single specimen occurred near the crater ‘‘ Kilauea,” of the yoleano Mauna Loa, Hawaii, but the 
exact particulars of its capture have unfortunately been lost. Most probably it was obtained by beating 
the branches of trees. 
Mus 184, 
Xyletobius affinis, n. sp. — Niger, pube subtilissima cinerescente, vestitus; an- 
tennis elongatis tenuibus, articulis 3°-6™ intus serratis, 4° et 5° brevibus ; elytris 
leviter striatis, parum inzequalibus. Long. 3, antenn. 13 m.m. 
Antenne black, as long as the elytra; from the fifth to the eleventh joint each 
is a little narrower and longer than its predecessor, so that only the third and 
three or four following joints can be said to be serrate; the third, fourth and 
