PHYTOPHAGOUS COLEOPTERA FROM MENTA WEI 139 



Hah. Si-Oban. 



I am obliged to separate this species from the rather nume- 

 rous forms having black elytra, of these, only those come into 

 consideration which have simple antennae in both sexes ; the 

 present insect is most nearly allied to A. Boisduvali, Baly but 

 that species is much larger and the elytra are very shining, in 

 A. apicipes they are dull and have no depression below the base, 

 both sexes are before me ; from the other species with black 

 elytra, the one before as diners in the fulvous labrum, the co- 

 lour of the tibiae and tarsi and in the but slightly depressed 

 median lobe of the last abdominal segment of the male, which 

 is deeply sulcate in several of the other species. 



19. Mimastra pallida, sp. n. — Pale testaceous, the terminal 

 joints of the antennae and the apex of the tibiae and the tarsi 

 more or less fuscous , thorax impunctate , transversely sulcate , 

 elytra finely and closely punctured. 



Length 2-3 lines. 



Head impunctate, not constricted behind the eyes, frontal tu- 

 bercles trigonate, contiguous with the carina, palpi long and 

 slender, antennae extending to the apex of the elytra in the 

 male, the lower three or four joints flavous, the rest fuscous, 

 second joint short, third one half longer, fourth joint as long as 

 the preceding three joints together and longer than the fifth, 

 thorax twice as broad as long, the sides very slightly rounded 

 at the middle, rather constricted at the base, anterior angles 

 rounded, the disc transversely sulcate at the sides, impunctate, 

 elytra closely and distinctly punctured, pale flavous, the interstices 

 here and there slightly wrinkled, underside and legs flavous, the 

 femora above and the tibiae below sometimes streaked with fuscous. 



Hab. Si-Oban, also Borneo (coll. Jacoby). 



This is one of the smaller species of the genus, most specimens 

 not attaining a larger size than 2 1 / 2 Paris lines, it is moreover 

 distinguished by the entirely flavous underside, and differs from 

 M. gracilis, Baly by the strong elytral punctuation. 



20. Haplosonyx ornatipennis, sp. n. — Flavous, antennae black, 

 the basal and the last joint flavous, thorax remotely punctured, 



