1902.] OF AMERICAN COLEOPTERA. 199 



depression below the base, punctured like the thorax and of the 

 same colour, the suture slightly infuscate ; below black, legs 

 testaceous, the posterior tibise deeply channelled at the apical 

 portion and also emarginate. 



Hah. La Plata. 



Of this very distinct species I possess two specimens ; in one of 

 these the basal joint of the antennae and the apex of the others is 

 more distinctly marked with fuscous. 



Systena brasiliensis, sp. n. 



Testaceous, the antennae (the basal joints excepted) black ; 

 thorax very minutely punctiired, the sides with or without a 

 black stripe ; elytra extremely finely and closely punctured, black, 

 the lateral and apical margins nari"owly testaceous ; abdomen 

 black. 



Length 5 millim. 



Head impunctate, testaceous or flavous, the frontal elevations 

 feebly raised, clypeus rather depressed anteriorly, scarcely separated 

 from the face ; antennae not extending to the middle of the elytra, 

 black, the lower fovu" joints testaceous below, the terminal five 

 joints distinctly shorter than the preceding ones ; thorax of 

 usual shape, the sides straight at the base, slightly rounded 

 anteriorly, the anterioi- angles obtuse, the basal sulcus shallow 

 but distinct, slightly sinuate, the surface with a few scarcely 

 perceptible punctures, testaceous, the sides with a narrow black 

 band ; scutellum black ; elytra with an obsolete depression below 

 the base, very closely and finely punctured, black, the lateral 

 margins narrowly and the apical one more broadly pale testaceous ; 

 below and the legs testaceous, the abdomen black, the posterior 

 femora black at the apex. 



Hah. St. Catharina, Espirito Santo, Brazil. 



There are six specimens of this distinct species before me, in 

 some of which the lateral thoracic stripe is more or less or 

 entirely obliterated. The species may be distinguished from 

 similarly coloured varieties of S. variahilis Jac, from Panama, by 

 the black abdomen, the shorter antennae, the more distinctly 

 marked thoracic sulcus, and the black apex of the posterior 

 femora. 



Systena abbreviata, sp. n. 



Below black, basal joints of the antennae fulvous, lower part of 

 the face flavous ; thorax finely punctured, testaceous, with a 

 transverse black band ; elytra minutely punctured, testaceous, a 

 subsutiiral and a sublateral stripe, abbreviated behind, black ; legs 

 testaceous. 



Length 5 millim. 



Head very finely wrinkled at the vertex, the latter piceous or 

 black, the lower portion flavous ; antennae piceous, the lower four 

 joints flavous, fourth joint longer than the third ; thorax twice 

 as broad as long, the sides feebly rounded before the middle, 



