and Species o/'Gallerucinse. 421 



In the unique specimen in my collection the left antenna 

 is double from the eighth joint. 



Chthoneis hivittata. 



C. elongata, angustata, parallela, nigra, nitida, aiitennarum arti- 

 culis penultimis duobus flavo-albidis ; thorace laBvi, im[)uiictato, 

 trifoveolato, foveis diiabus transversim positis, magnis, profunde 

 impressis, unaque parva ante basin posita ; elytris confuse punc- 

 tatis, piceo-nigris, utrinque vitta lata basi et apice abbreviata, 

 flavo-alba. 



Long. 2 lin. 



Hah. Brazil, Constancia. 



Vertex smooth, impunctate ; encarpse subquadrate ; carina 

 narrow, wedge-shaped, its apex very acute ; eyes very large, 

 prominent ; antenna? equal to the body in length, the second 

 joint very short, the third still shorter than the second, piceous, 

 the fourth to the eighth very slightly compressed, obsoletely 

 dilated. Thorax rather broader than long ; sides straight and 

 parallel, slightly converging towards the apex, the anterior 

 angles thickened, obtuse ; upper surface transversely convex, 

 impressed with three fovese, one just in front of the base, small 

 and shallow, and two others, much larger and more deeply 

 excavated, placed transversely on the middle disk. 8cutellum 

 trigonate, its apex obtuse. Elytra broader than the thorax, 

 parallel, distinctly punctured, the interspaces granulose, sub- 

 rugulose. Claws acutely appendiculated. 



This species differs from the typical form of the genus by 

 the less dilated and less compressed intermediate joints of the 

 antennse and by the acutely appendiculated claws. 



Chthoneis albicollis. 



C subelongata, nigra, nitida, pedibus (tibiis apice tarsisque ex- 

 ceptis), thorace antcnnarumque articulis ultimis tribus albidis ; 

 thorace transverso, lievi ; elytris anguste oblongis, crebre et for- 

 titer punctatis, interspatiis rugulosis. 



Long. 2-3 lin. 



Hah. Brazil, Petropolis. Collected by Mr. J. Gray. 



Vertex smooth, impunctate ; encarpte transversely trigonate, 

 contiguous; carina narrowly wedge-shaped ; antennge longer 

 than the body, the second and third joints very short, equal, 

 the fourth to the eighth compressed and slightly dilated, the 

 ninth to the eleventh cylindrical, filiform, wliite, the extreme 

 apex of the terminal one black. Thorax more than twice as 

 broad as long ; sides slightly rounded; disk smooth, impunc- 

 tate, impressed on either side with a very shallow ill-defined 

 fovea, only visible when viewed obliquely. Elytra black, 



