DESCRIPTIONS OF NEW SPECIES OF MASTOSTETHUS. 67 



fovea, the surface testaceous, extremely minutely and remotely punc- 

 tured ; scutellum black ; elytra very slightly narrowed posteriorly, 

 testaceous, closely impressed with deep and dark punctures, the mar- 

 gins very narrowly and a triangular spot on the shoulders black ; at 

 the apex this colour is slightly widened ; under side and legs flavous, 

 the sides of the breast black, femora darker fulvous, the posterior ones 

 incrassate, the outer margin of the tibife and tarsi black. 



Hah. Upper Amazons. 



MaSTOSTETHUS BOLIVIANUS, Sp. D. 



Flavous ; a central band at the head, the disc of the thorax, and 

 the breast and legs, black ; elytra finely punctured, flavous, a broad 

 longitudinal band occupying the entire disc and abbreviated at the apex 

 black. Length, 7 mill. 



Head with the usual punctures near the eyes, pale fulvous, the 

 base, a longitudinal central band, and the space in front of the eyes 

 black, the clypeus and the labrum with another transverse black spot, 

 the indented portion of the eyes and the palpi fulvous ; antennae black, 

 the basal joint flavous below ; thorax twice as broad as long, the pos- 

 terior angles acutely pointed, the disc nearly impunctate, black, the 

 sides narrowly flavous ; scutellum black ; elytra somewhat remotely 

 and finely punctured, each with a broad longitudinal black band, 

 pointed at the apex, obliquely rounded anteriorly ; this band leaves the 

 extreme lateral and satural margin, as well as a narrow space round 

 the scutellum, of the flavous ground colour ; the apex of the elytra in 

 shape of a triangular patch remain likewise flavous ; under side black, 

 the apex of the anterior femora and the base of the abdominal segments 

 are flavous ; the tibife are strongly curved. 



Hah. Bolivia. 



In its system of coloration this species resembles somewhat 

 M. ephippiger, Mann., but in that species the elytral black band 

 is of quite a different shape, strongly narrowed at the shoulders, 

 and constricted at the middle, the whole base of the head is 

 black, and the entire abdomen is flavous. 



Mastostethus quadriplagiatus, sp. n. 



Fulvous ; the head with one, the thorax with two spots and the 

 sides black ; elytra closely punctured, the extreme sutural and lateral 

 margins, a triangular spot at the base, and a transverse one at the 

 middle black. Length, 8 mill. 



Head closely punctured near the eyes, fulvous, with a black spot 

 between the latter parts ; first joint of the antennit) fulvous, with a 

 black spot above, the other jomts wanting ; thorax about twice as 

 broad as long, the lateral margins slightly concave, the angles acnte, 

 the disc with a few scarcely perceptible punctures, fulvous, the sides 

 with a slightly curved black band near the lateral margins, the middle 

 of the disc with two black spots ; scutellum impunctate, fulvous ; elytra 

 closely and finely punctured, fulvous, the extreme sutural and lateral 

 margins black, the middle of the base with a triangular black spot, the 

 disc with a short transverse band at the middle, not extending to either 



