578 PHYTOPHAGOUS COLEOPTERA FROM MADAGASCAR. [NoV, 1, 



following elongate, gradually diminishing in length ; thorax trans- 

 verse, short, the sides nearly straight ; elytra irregularly punctured, 

 their epipleurse very narrow, entirely disappearing below the middle ; 

 legs slender ; all the tibise with a spine, the first joint of the pos- 

 terior tarsi as long as the following three joints together ; claws 

 appendiculate ; prosternum invisible between the coxse, the anterior 

 coxal cavities open. 



The insect for which this genus is proposed has the general 

 appearance of the species forming the genus Mimastra, from which 

 it is distinguished by the mucronate tibise; the narrow epipleuriE, 

 invisible below the middle, and the spines on all the tibise separate 

 the genus from Luperus. 



MiMASTROIDES MADAGASCARIENSIS, n. Sp. (Plate XXXIX. 



%. 11.) 



Obscure testaceous, the base of the head, the labrum, antennae, 

 the upperside of the femora, and the tibiie and tarsi black ; thorax 

 and elytra testaceous, closely semi-rugosely punctured. 



Length 3 lines. 



Head finely and sparingly punctured on the vertex, the basal 

 portion blackish, the frontal elevations small but distinct, the clypeus 

 triangular, raised, yellowish ; lahrum and palpi black ; eyes very 

 large ; antennae about half the length of the body, black, the first 

 joint elongate, thickened at the apex, the second one short, the third 

 and fourth slender, equal, the apical joints shorter ; thorax twice as 

 broad as long, the sides straight, the anterior angles thickened and 

 slightly oblique, the posterior angles in shape of a small tubercle, 

 the surface flat, closely punctured, the interstices slightly rugose ; 

 scutellum obscure piceous, broad ; elytra without basal depression, 

 punctured like the thorax, obscure testaceous ; breast slightly darker, 

 the upper portion of the femora, the tibite, and tarsi black ; the apex 

 of the last abdominal segment triangularly emarginate. 



Galerusoma, n. gen. 



Elongate, impubescent. He^d produced, eyes entire ; palpi slender ; 

 antennae filiform, the first joint very long and the longest; thorax 

 subquadrate, scarcely broader than long, the surface flat without 

 depression ; scutellum rather broad ; elytra wider at the base than 

 the thorax, elongate, irregularly punctured, their epipleurse narrow, 

 disappearing below the middle ; legs slender ; tibiae unarmed, the 

 first joint of the posterior tarsi as long as the following three joints 

 together ; claws bifid ; the anterior coxal cavities closed. 



This genus, in its elongate and slender shape, resembles somewhat 

 the genus Mimastra ; its principal distinguishing characters are the 

 very long and slender first joint of the antennae and the bifid claws, 

 which separate the genus also from Mimastroides. 



Galerusoma apicicorne, n. sp. 



Fulvous, the Ion er and the apical three joints of the antennae, the 

 tibiae, and tarsi black; thorax very minutely, elytra more strongly 

 and very closely and irregularly punctured. 



