COLEOPTERA 125 



each side of the thorax from base to apex. In the $ (the only sex obtained), the dorsal 

 edges of the elytra are very evidently flattened for a considerable distance from the 

 base. The puncturation of the whole insect, allowing for the difference in size, does 

 not materially differ from that of R. stygins. 



Hab. Kauai Mountains (4000 ft.); i % taken. 



(6) Rhyncogonus molokaiensis, sp. nov. 



Niger, subnitidus, antennis pedibusque saepe rufescentibus. Caput circa basim 

 dense subtilius punctatum. Antennarum articulus tertius secundo vix brevior. Pro- 

 thorax dense (nee grosse) punctatus, macula utrinque ad basim pubescente ornatus. 

 Elytra subnitida, fere glabra. Long. 9*5 — 12 mm. 



Black, and somewhat shining, the legs and antennae more or less of an obscure 

 red colour. The head is closely and finely punctured at the base, the second joint of 

 the antennae subequal to, or rather longer than, the third. Thorax densely, but not 

 coarsely, punctured ; the punctures, however, are much larger and stronger than those 

 at the base of the head. There is a very distinct smooth median dorsal line extending 

 from base to apex, and a small spot of pale pubescence on each side at the base. The 

 elytra are not very dull, and are almost without pubescence, and the surface is slightly 

 roughened by delicate corrugations proceeding from the punctures. In both sexes the 

 two apical segments of the abdomen beneath are clothed with pubescence, which is 

 very dense on the apical one. The other segments have only very sparse and minute 

 hairs. In the ^ the apical segment is broad and truncate, in the $ narrow and some- 

 what pointed at the apex, as is usual throughout the genus. 



Hab. Molokai, mountains (3000 ft.) ; rare. 



(7) Rhyncogon7is ditbins, sp. nov. 



Niger, vix nitidus, elytris vix evidenter pubescentibus, Z praecedenti cognatissimus, 

 capite circa basim baud dense punctato, elytris magis corrugatis, distinguendus. ^. 

 Long, fere 10 mm. 



I have seen only a single Z of this species, which is closely allied to that of 

 R, violokaiensis, but apparently distinct. The front of the head (including the rostrum) 

 is by no means densely punctured, and at the base the punctures are larger and much 

 more sparing. The smooth dorsal line on the thorax is much more definite, and the 

 surface of the elytra less smooth, owing to the stronger corrugations. 



Hab. Molokai, Kalae (1700 ft.); i t taken. 



