1. Arthrocorynus brachialis, sp. n. Black, variegated with fulvous, cinereous or white, and blackish scales, the whitish scales condensed into three patches at the base of the prothorax, and a broad, transverse, scutellar patch and a subapical fascia on the elytra; the vestiture of the under surface and legs sparser, the latter subannulate. Head densely, rugosely punctate, flattened or depressed between the eyes, which are separated by the width of the rostrum; rostrum curved, rugosely punctate, except along the smooth raised median line, which becomes cariniform at the base, very much smoother in some specimens of the female. Prothorax constricted and greatly narrowed in front, the sides subparallel at the base ; densely punctate and also carinate. Elytra subparallel towards the base, narrowing from before the middle, the scutellar region transversely depressed; seriate-punctate, the interstices conspicuously seriato-granulate, the alternate ones raised. Beneath coarsely punctate. Anterior femora obsoletely dentate, the anterior tibiae serrulate within, and the anterior tarsi with joints 1 and 2 strongly dilated on the outer side at the apex, in the male. Length 6-12, breadth 2.8-5.5 millim. (Male, Female) Hab. Mexico, Orizaba (Salle); Beitish Honduras (Blancaneaux); Guatemala, Panzos, Teleman, San Isidro, Las Mercedes, Pantaleon, Volcan de Atitlan (Champion). -Amazons (Mils. Brit.). Found in abundance on both the Atlantic and Pacific slopes of Guatemala on fallen timber, the specimens varying greatly in size and to some extent in the development of the anterior legs of the male. The asymmetrically dilated basal joints of the anterior tarsi in this sex, the transverse whitish patch at the base of the elytra, etc., distinguish the present species from the following one. In some of the females from Panzos and San Isidro the rostrum is almost smooth.