March, 1S84.] 217 



ON SOME OENERA OF THE SUB-FAMILY ANCEOMENINI {PLATY- 

 NINI, HOEN) FROM THE HAWAIIAN ISLANDS. 



BY D. SHAEP, M.B. 



The Hawaiian members of this group show a great variety of 

 appearance, and must form several genera, which may be defined as 

 below : — 



Meteo MENUS (n. g.). 



This genus comprises the larger number of the Hawaiian species 

 hitherto placed in AncJiomenus, Colpodes, and Di/scolus, from whicli 

 it is distinguished by the total absence of systematic setas on the 

 pronotum. The elytra are margined at the base, and the scutellum 

 penetrates backwards between the margins, the fourth joint of the 

 tarsi may be either conspicuously bilobed or only slightly emarginate ; 

 the mesothoracic epimera ai'e short externally. The rather numerous 

 species agree satisfactorily in these characters, with, the exception of 

 Ayichomenus mysficus, Blackb., which has the scutellum smaller, and 

 scarcely penetrating between the basal margins of the elytra : this 

 species may, perhaps, be entitled to generic isolation, but the material 

 at my disposal does not enable me satisfactorily to examine into this. 



CoLPODiscTJS (n. g.). 



Elytra margined at base, scutellum scarcely penetrating between 

 the basal margins ; pronotum furnished with a single systematic seta, 

 placed close to the hind angle, mesothoracic epimera considerably pro- 

 longed externally ; anterior and middle tarsi bilobed, posterior either 

 bilobed {A. lucipetens, Blackb.) or slightly emai^ginate (Dyscolus tan- 

 talus, Blackb.). The existence of the thoi'acic seta in conjuction with 

 the scutellar structure, justifies the formation of this genus, though the 

 two species forming it are very discordant in appearance. 



Baetpeistus (n. g.). 



Stature large and robust, the after-body large and heavy ; elytra 

 margined at the base, scutellum dividing the margins ; pronotum with 

 a single systematic seta placed some little distance in front of the 

 hind margin ; mesothoracic epimera much prolonged externally ; all 

 the tarsi with the fourth joint emarginate, but not bilobed. ' The three 

 species of this genus form a sufficiently natural group ; one of them, 

 AncJiomenus Sharjpi, Blackb., forms, perhaps, the nearest approach of 

 the Hawaiian Carahidce to the great genera Ancliomenus and Colpodes, 

 from which it differs bj' the absence of the anterior systematic seta on 



