DESCRIPTIONS OF NEW SPECIES OF MAST08TETHUS. 65 



at the middle and two spots at the sides black ; scutellum black ; 

 elytra finely and rather closely punctured, the base more strongly so, 

 black, with two transverse yellowish narrow bands, the edges of which 

 are irregularly notched, the first baud placed immediately before the 

 middle, the other of slightly concave shape near the apex ; under side 

 fulvous, the sides of the breast and an obscure oblique streak at the 

 sides of the mesosternum black, the latter strongly produced into a 

 conical point ; legs fulvous, the femora with black stripes above or 

 below, tibiae and tarsi entirely black. 



Hah. Peru. 



Almost identical in coloration with M. alternans, Lac, but 

 the elytral pale bands much narrower and irregular in outlines, 

 the basal margin not pale as in that species, and the elytral 

 punctuation finer. From M. trifasciatus, Lac, the species 

 differs in the markings of the head and thorax, also in the 

 absence of the basal elytral pale band. 



Mastostethus lacordairei, sp. n. 



Flavous ; the antennae, tibias, and tarsi black ; head with a black 

 band ; thorax very finely punctured, black, the margins flavous ; 

 elytra extremely closely and finely punctured, flavous, a broad trans- 

 verse band at the base (not extending to the basal margin) and another 

 one below the middle black. Length, 10 mill. 



Head strongly punctured at the vertex, the lower portion near the 

 eyes more finely and closely punctate, flavous, the upper portion with 

 a broad longitudinal band extending to the middle of the eyes ; antennaB 

 black, terminal joints broadly dilated ; thorax of usual shape, rather 

 closely and finely punctured, the disc black, the margins narrowly 

 flavous ; scutellum black ; elytra distinctly narrowed posteriorly, very 

 closely punctured, a broad transverse band at the base, narrowed 

 towards the suture, and not extending quite to the basal margin, and 

 another narrower band below the middle black ; under side and the 

 femora flavous ; the tibiae and tarsi, the anterior and intermediate 

 femora, with a black streak above ; mesosternum produced anteriorly. 



Hab. Peru. 



Closely allied to M. tibialis, Fab., but with the basal elytral 

 band extending right across the suture, the thorax with the 

 margins flavous only, the posterior band of the elytra placed 

 higher, not concave at its upper edge, the margins not black but 

 flavous. 



Mastostethus argentinensis, sp. n. 



Flavous ; the upper portion of the head, the disc of the thorax, 

 the scutellum, and the tibiae and tarsi black ; elytra strongly and 

 closely punctured, flavous, with a transverse band before, another 

 behind, the middle, and the extreme apex black. Length, 8 mill. 



Head closely and strongly punctured near the eyes, black, the 

 lower portion flavous, the two colours separated by a straight margin, 

 the space between the antennae impressed with a deep transverse 

 sulcus ; antennae black, the lower four joints shining, the rest opaque ; 



