66 THE ENTOMOLOGIST. 



thorax about one-half broader than long, narrowed anteriorly, the disc 

 very finely and sparingly punctured, black, the lateral and the pos- 

 terior margin narrowly flavous ; scutelluni black ; elytra rather strongly 

 punctured, tlavous, with two transverse black bands, the first placed 

 before the middle, rather narrow, not wider than the following flavous 

 space, its edges irregularly dentate ; the second band rather broader, 

 and nearly regular in outlines ; both bands do not quite extend to the 

 lateral margins ; the extreme apex likewise black ; under side flavous, 

 the sides of the breast with a small black spot, the anterior and inter- 

 mediate femora with a black streak above ; tibia? and tarsi entirely 

 black. 



Hah. Prov. Tucuman, Argentine Eepublic. 



Of this species I received two specimens from the La Plata 

 Museum. The insect is closely allied to M. 5-maciilattis, Lac, 

 but in that species the vertex of the head is fulvous, the basal 

 elytral band is wider and of more regular shape, and the apex of 

 the elytra is fulvous ; the under side also differs in coloration. 



Mastostethus nigricollis, sp. n. 



Black ; thorax impunctate, with an obscure fulvous spot at the 

 base ; elytra dark reddish fulvous, closely punctured. Length, 10 mill. 



Head black, shining, with the usual group of punctures near the 

 eyes; antennae with the lower four joints shining, black; thorax, 

 scarcely twice as broad as long, the angles very pointed, the disc 

 entu-ely impunctate, black, with a small obscure fulvous spot at the 

 middle of the base ; scutellum fulvous, with a few fine punctures ; 

 elytra rather closely and finely punctured, the punctures much finer 

 posteriorly, dark chestnut-brown ; under side and legs black ; the last 

 abdominal segment fulvous or partly so ; mesosternum strongly pro- 

 duced. 



Hah. Prov. Goyaz, Brazils. 



Closely allied to M. abdominalis, Klug, but the elytra dark 

 brown without black basal margin, the abdomen with the last 

 segment fulvous only, and the thorax with a fulvous spot, as well 

 as the scutellum entirely, of this colour ; two exactly similar 

 specimens are contained in my collection. 



Mastostethus balyi, sp. n. 



Testaceous ; the head with a longitudinal black band ; thorax with 

 a few minute punctures ; scutellum black ; elytra strongly and closely 

 punctured, the extreme sutural and lateral margins, a spot on the 

 shoulders and the extreme apex, black ; sides of the breast, the outer 

 margin of the tibias, and the posterior tarsi black. Length, 9 mill. 



Head testaceous, finely punctured near the eyes, the latter very 

 large, the indented portion black ; the middle of the vertex with a 

 broad and long longitudinal band, which consists almost of two parts, 

 joined at the middle ; labrum black ; antennae obscure flavous, the 

 lower joints with a black streak above ; thorax short and transverse, 

 the angles acute but scarcely produced, the posterior ones with a deep 



