182 THE ENTOMOLOGIST. 



DESCRIPTIONS OF SOME NEW SPECIES AND A NEW 

 GENUS OF CHRYSOMELID^ FROM SOUTH AMERICA. 



By Martin Jacoby. 



(Continued from p. 170.) 



Megalopus brasiliensis, sp. n. 

 Black, closely pubescent ; head finely rugose ; thorax closely 

 punctured, the sides dark brown, the disc piceous ; elytra dark chest- 

 nut-brown, shining, the base strongly raised, the apex pubescent ; 

 legs black. Length 7 mill. 



Hab. St. Catarina. 



Short and subquadrate ; the head finely rugose, black ; antennae 

 entirely black ; thorax transversely subquadrate, with a transverse 

 anterior and posterior groove, the surface finely punctured, with a 

 narrow central longitudinal ridge, nearly black, the sides dark brown, 

 clothed with long black pubescence like the head ; scutellum broad, 

 brownish, pubescent ; elytra with the basal portion raised into high 

 round callosities ; the shoulders acutely raised, the surface of a shining 

 dark chestnut brown, sparingly punctured near the base, the apical 

 portion likewise raised and more closely covered with black hairs, 

 forming a small tomentose patch on each elytron ; under side and legs 

 likewise covered with long black and grey hairs ; posterior femora 

 incrassate, their tibiae straight. 



Of this species I possess a single female specimen only. The 

 insect is closely allied to M. pilipes Lac, but differs in its short 

 and subquadrate shape and the colour of the elytra and that of 

 the legs, which are entirely black. 



Megalopus thoracica, sp. n. 

 Short and narrowly elongate, flavous ; antennae (the basal joint 

 excepted) black ; head at the vertex and a transverse band between the 

 eyes blackish ; thorax closely and distinctly punctured, a band at each 

 side, and a triangular spot at the middle, black; elytra finely pubescent, 

 the sides obscure fuscous. Length 7 mill. 



Hah. Jalahy, Prov. Goyaz, Brazils. 



This species is so closely allied to M. hrevipennis in every 

 respect, that I am somewhat doubtful as to its specific distinc- 

 tion, but the different sculpture of the thorax seems to suggest 

 another species ; but this is the only difference, and sufficient to 

 distinguish it for the present. In M. hrevipennis the thorax is 

 finely and closely rugose, punctate, and opaque. In the present 

 insect it is shining, the punctures are larger and distinctly 

 separated, and instead of an M-shaped mark there is a triangular 

 central patch and a narrow band at each side ; the suture at the 

 middle has also a small fuscous spot. I have also received two 

 female specimens from the same locality which agree entirely in 

 structural details, but not in colouration, as the thorax is black, 

 with the sides and two small oblique streaks flavous ; the last 



