590 



that have been inchided in it are inseparable from the latter 

 genus. Including the three new ones here described, six species 

 of Trigonopterus are now known from the Samoan Islands, and 

 •they may be distinguished by the characters given in the fol- 

 lowing key : 



1. (10). The apical portion of the elytra much produced backwards, 



the dorsal outline sloping gradually behind. 



2. (5). Prothorax finely 2:)unctate above; elytra almost impunctate on 



the disk. 



3. (4). Elytra with a transverse fascia at the base and an oblong 



fascia at the apex formed of snow-white hairs, and with two 

 distinct lines of punctures at the lateral margin; sides of 

 prothorax subparallel in the basal half aeneoniveus Frni. 



4. (3). Elytra entirely without white markings and with only one 



lateral row of punctures ; sides of prothorax convergent an- 

 teriorly throughout siibmetaUicus sp. n. 



5. (2). Prothorax coarsely punctate; elytra with regular rows of 



punctures throiighout. 



6. (7). Prothorax not constricted at the apex; 7th row of punctures 



on the elytra extending only from the apex to the middle. 

 liicolor sp. n. 



7. (6). Prothorax constricted at the apex; 7th row of punctures on 



the elytra extending nearly to the base. 



8. (9). Elytra with all nine rows of punctures more or less striate, 



and with an elongate spot of white scales on each side at 

 the apex binotatus sp. n. 



9. (8). Elytra with only the 1st and 2nd and 9th rows of punctui'es 



striate, and without white spots samoai^us Hell. 



10. (1). The apical portion of the elytra not produced backwards, the 

 dorsal outline abruptly declivous behind cribreUicoUis Frm. 



Trigonopterus submetallicus sp. n. 



Color uniform shiny black, purplish or bronze. 



Male and female. Head with distinct separated punctures, which 

 gradually disappear on the extreme vertex ; the forehead with much 

 coarser confluent punctures and short erect pale setae; a deep furrow 

 along the upper margin of each eye. Eostrum (male) with three well- 

 marked dorsal carinae extending nearly to the apex, and an additional 

 carina on each side forming the upper edge of the scrobe ; the surface 

 set with short suberect white setae placed transversely, except at the base 



