169 



DESCRIPTIONS OF SOME NEW SPECIES AND A NEW 

 GENUS OF CHRYSOMELID^ FROM SOUTH AMERICA. 



By Martin Jacoby. 



Mastostethus flavovittatus, sp. n. 



Reddish-fulvous ; the margins of the thorax and two curved 

 markings on the disc, flavous ; elytra closely and strongly punctured 

 and subrugose, fulvous, a narrow oblique stripe from the base to the 

 margin and another angulate stripe below the middle, flavous. Length 

 11 mill. 



Hab. Marcapata, Peru. 



Broad and subdepressed, entirely reddish-fulvous; the head closely 

 punctured near the eyes with a longitudinal central groove ; eyes 

 deeply notched ; antennae pale fulvous, extending to the base of the 

 elytra; the lower four joints shining, the rest opaque, pubescent; 

 thorax obliquely narrowed anteriorly, the sides straight, the surface 

 extremely finely punctured, fulvous, the margins and two semicircular 

 marks at the middle flavous ; elytra strongly and closely punctured 

 with traces of longitudinal raised lines, each elytron with a very 

 narrow flavous stripe, which extends from the scutellum to the middle 

 of the lateral margin, another stripe below the middle is of less oblique 

 direction and extends from the margin to the suture, upwards of which 

 it is angularly continued for a short distance ; under side and legs 

 fulvous ; the metasternum compressed and strongly raised. 



This handsome species is quite unlike any of its allies in 

 colouration and pattern. I have seen two similar specimens, 

 one of which I received from Herr Bang-Haas. 



Mastostethus peruensis, sp. n. 



Rufous ; the antennae, tibife, and tarsi black ; thorax with four 

 black spots; elytra closely punctured, black; a broad curved band 

 below the middle, flavous. Length H mill. 



Hab. Marcapata, Peru. 



Head finely and closely punctured, with a small black central spot, 

 the ground colour rufous ; antennae black ; thorax very finely punc- 

 tured, of usual shape, rufous, with four small black spots, placed 

 transversely, the outer ones near the posterior angles, the others at 

 the middle ; scutellum rufous ; elytra with a shallow depression near 

 the suture, very closely punctured, black, with a broad transverse 

 curved flavous band below the middle ; tibiiB and tarsi black. 



Of almost exactly similar colouration as M. Batesi, Baly, but 

 of broader shape, with a feeble sutural elytral depression, the 

 elytral band much broader, of equal width and concave, the head 

 with only a single small black spot. 



ENTOM. — JUNE, 1903. 



