200 [February, 



pedibus piceis plus minusve rufescentibus, rostra lato,rugoso-punctato ; antennis 

 robustis, rostro caplte prothoraceque conjunctis paulo brevioribus, funiculi 

 articulo secundo primo paulo longiore ; prothorace fortiter transverso, antice 

 fortiter angustato, parce nee fortiter punctato ; elytris haud striatis, seriatim 

 fortiter nee crebre punetatis, interstitiis parce subtilius punctatis ; subtus 

 abdominis parte anteriori minus fort iter punctata. Long. 4f — 5f mm. 



Ill bark ; near the crater " Kilauea," on Mauna Loa, Hawaii. 



The other described species whose elytra are not distinctly striated 

 are either of elongate form, or having the elytra of the peculiar build 

 which I have called " bisinuate ;" nivicola, the striation of whose elytra 

 is obscure in one sex, has totally different antennae. 



O. SFBSTRICTUM, Sp. UOV. 



Ovation, nitidum, nigro-aneum ad viridem accedens, antennic rufo-testaceis, 

 pedibus piceis plus minusve rufescentibus ; rostro fortiter punctato rugatoque ; 

 antennis rostro capite prothoraceque conjunctis paulo brevioribus, funiculi 

 art i cutis primo et secundo elongatis, hoc illo paulo longiore; prothorace trans- 

 verso antice angustato, parcius nee fortiter punctato ; elytris a latere fortiter 

 bisinuatis, confuse punctatis, aliquot punct is {quo? majora sunt cceteris) seriatim 

 dispositis ; subtus abdominis parte anteriori parce fortiter punctata. 



Long. 4|- — 5| mm. 



Various localities on Haleakala, Maui, up to 4000 feet, but not 

 taken commonly. 



I have had specimens of this insect for some time past separated 

 from the other species of the genus, and some doubtfully placed with 

 O. obscurus. The addition and examination of fresh specimens this 

 year have, however, led me to regard them all as appertaining to a single 

 somewhat variable species, some examples of which are narrower and 

 more elongate than others, while in some examples the punctuation 

 (especially on the under-side) tends to become extremely confused, and 

 even obscure. The distinctive features of the species appear to be, 

 rather long, stoutish antennae, with the basal two joints of the funiculus 

 elongate, the 2nd markedly more so than the 1st, and elytra con- 

 tracted about the middle, so that their outline is of two distinct curves. 

 It is allied to obscurum, but differs by its average superior size, 

 strongly sculptured rostrum, non-striate elytra, &c. 



Of this, and the preceding species, I have examples in which the 

 rows of punctures run into obscure striae near the apex, according to 

 a (probably sexual) peculiarity of the genus, previously referred to 

 bv me. 



