COLEOPTERA 411 



(17) Labroccnis qiiadrisigmxtiis, sp. nov. 



% Niger, parum convexus, pubescens, antennarum basi tibiisque rufis, tarsis sor- 

 didis ; elytris signatura post-basali maculaque ante-apicali testaceis. Long. 3I mm. 



Resembles L. jayiwi, but is readily distinguished by the obscure separation of the 

 basal lobe of the thora.\. We have onh" females. The upper surface has much setosity. 

 The punctuation is fine and rather indistinct, but is nevertheless a true, impressed 

 punctuation. Five specimens. 



Hab. Maui, Haleakala, 4000 — 5000 ft. v. 1896 (Perkins). 



(iS) Labroccrus sitjfiisus, sp. nov. 



$ Niger, pallido-setosus, parum convexus, antennarum basi, pedibus elytrisque 

 testaceis, his ad basin late ad suturam anguste nigris. Long. 3^^ — 3! mm. 



Distinguished from all the other species of this group by the yellow colour of the 

 elytni, in which respect it resembles L. obsolctits of the preceding group. The legs 

 ha\e both the tarsi and femora much infuscate and the club of the antenna is quite 

 black. There are some black hairs on the margins of the elytra. There is a fine, 

 rather distant punctuation on the upper surface, but on the elytra this is very indistinct 

 except at the base. Two specimens. 



Hab. Maui, Haleakala, 5000 ft. v. 1896 (Perkins). 



Akgocerus, gen. nov. 



^ Antennae clava magna oblonga, biarticulata, articulo ultimo praesertim grande, 

 articulis 3" — 9" minutis. Palpi maxillares breves, crassi. 



This genus is closely allied to Labroccrus, but with very different antennae in both 

 sexes : the terminal joint being elongate, the tenth joint large and coadapted with the 

 terminal one to form a two-jointed club, while the preceding joints are minute and 

 difficult to count. 



(i) Argocerns siviilaris, sp. nov. 



Sat convexus, niger, pubescentia sat elongata vestitus, elytris fasciis duabus pubes- 

 centiae pallidae discretis ; antennis articulis 9" et 10° testaceis, chiva biarticulata lusco- 

 nigra. Long. 2^ mm. 



This has a great similarity to Labroccrus vioercns. The upj)er surface is covered 

 with a dense, indefinite sculpture rendered more obscure by the clothing ot hairs; 

 the thoracic lobe is well developed. In the male the terminal joint oi the antenna 

 (Plate XHL fig. 16) is oblong, three times as long as broad, and the ninth joint is about 

 as long as broad, and almost as broad as the terminal joint, thus iorming a great 



