166 MR. M. JACOBY ON NEW [Mar. 2, 



6. Descriptions of new Species of Phytophagous Coleoptera. 

 By Martin Jacoby. 



[Eeceived February 18, 1880.] 

 (Plate XVIII.) 



Genus Mastostethus, Lac. 



1 . Mastostethus chontalensis, sp. nov. 



Oblong, parallel. Testaceous ; base of head, a transverse fascia on 

 the thorax, and two transverse bands on the elytra, one at the 

 base, the other behind the middle, black ; sides of the breast, a streak 

 at the upperside of the femora, and the tibiae black. 



Length 4| hoes. 



Hab. Chontales, Nicaragua. 



Base of head closely punctured near the eyes ; lower part of face 

 testaceous, very shining, deeply transversely grooved ; apex of jaws 

 black ; antennae light testaceous, the first three joints black, closely 

 pubescent. Thorax transverse, subquadrate, angles distinct, sides 

 slightly contracted near the base and apex ; surface widely, but di- 

 stinctly punctured, the entire disk occupied by a transverse black 

 band of rather irregular shape, thickened at each end. Scutellum 

 black, distinctly punctured. Elytra irregularly and deeply punctured ; 

 the base is occupied by a rather large black transverse band which 

 docs not quite touch the lateral margins, and is narrowed towards 

 the scutellum ; while another broader band is placed behind the 

 middle, the anterior margin of which is slightly sinuate. Underside 

 testaceous ; sides of breast, upper surface of the femora, and the 

 tibiae black. 



This species is closely allied to M. vicimis, Lac, but differs iu 

 several particulars as regards coloration, the principal difference con- 

 sisting in the want of the black extremity of the elytra. 



Collected by Mr. Belt. Iu the collection of Messrs. Godman and 

 Salvin. 



2. Mastostethus rogersi, sp. nov. 



Oblong. Dark nifous ; antennae black ; elytra testaceous, closely 

 punctured, a spot at the base and a broad band behind the middle 

 black. 



Length 4 lines. 



Hab. Cache, Costa Rica. 



Head with some spots on the vertex, closely punctured round the 

 eyes, with a short longitudinal fovea in the middle, entirely dark 

 rufous ; antennae black, the first four joints shining, the rest 

 closely pubescent. Thorax wider at the base than the apex ; the 

 angles rather blunt ; surface with a few distinct punctures. Scu- 

 tellum rufous, its apex black. Elytra wider at the base than the 

 thorax, deeply and irregularly punctured, testaceous ; the base of 



