174 FAUNA HAWAIIENSIS 



Xyleborus {X. confiisus). The greater number of the species of Xyleboriis and Hypo- 

 thenemus are true forest insects and are no doubt peculiar to the islands. Owing to the 

 extreme sexual differences exhibited by the species of Xylebortis it is impossible in most 

 cases to unite the sexes from a mere inspection of the specimens, so that it is probable 

 that some of the males described will prove to belong really to females described under 

 another name, and therefore the species will be less numerous than they appear to be. 

 So far as is at present known most of the species of this genus are restricted each one 

 to a single island, and of those with a wider distribution some I suspect are not truly 

 indigenous — X. iviniaturtis for example — and will prove to have been imported by man. 

 The species assigned to Hypothenenius are at present very imperfectly known, and 

 would appear to be rare insects, and it is doubtful whether, excluding H. erudiius, they 

 are true members of that genus. It may be remarked that in addition to the species 

 here enumerated a small Scolytid has been recendy imported into the islands, and is said 

 to be very injurious to certain fruit-trees in some localities, but I neglected to collect or 

 examine this insect. 



Tribe TOMICINI. 

 Xyleborus Eichh. 



( I ) Xyleboriis molokaieiisis, sp. nov. 



Elongatus, cylindricus, piceo-niger, setis aureis elongatis postice sparsim vestitus. 

 Elytra subopaca, sat distincte seriatim punctata, parte declivi juxta suturam utrinque 

 tuberculis minutissimis 2 vel 3, lineariter dispositis, munita. $. Long. 4' 25 mm. 



Distinguished by its large size and dull elytra, which bear on the apical declivous 

 portion two or three very minute tubercles on each side of and near to the suture, and 

 placed nearly in a line with one another. From the base of each of these tubercles 

 springs a long fine golden seta. Exterior to each of these series of tubercles may often 

 be detected one or two other excessively minute ones on either wing-case, and the 

 general surface of this posterior portion of the elytra under a very strong lens is 

 minutely asperulous. 



Hab. Molokai, above 4000 ft. In the wet decaying wood of Cheirodendron. 



(2) Xyleborus kmiaiensis, sp. nov, 



X. molokaiensi magnitudine et forma simillimus, elytrorum parte postica declivi 

 similariter tuberculis munita, sed colore testaceo vel rufo-testaceo, elytris sat evidenter 

 nitentibus distinguendus. %. Long. 4 mm. 



Hab. Kauai, Halemanu and above Waimea (4000 ft.). Four examples taken. 



