1901.] PHYTOPHAGOUS COLEOPTEHA. 159 



other more or less highly raised tubercles occupy the posterior 

 portion of the elytra, the intermediate spaces are sparingly but 

 rather deeply punctured, but anteriorly some slight ridges are seen 

 which connect partly some of the tubercles, the suture is finely 

 crenulate for two thirds its length ; the pygidium is of a much 

 more bright cupreous gloss than the rest of the surface and is 

 longitudinally sulcate near the margins, two small foveas are also 

 seen at the basal portion, the rest of the disc is sparingly punc- 

 tured and shining; the entire underside is closely and finely 

 foveolate-punctate, the legs extremely finely punctured and of the 

 same sombre cupreous colour. 



Hah. Argentine E,., Cordova. 



The acute and ridge-like elevations of the thorax, the absence 

 of elytral costas, and the metallic cupreous pygidium distinguish 

 this species from any other of similar coloration and size. 



Chlamts cltpeata, sp. n. (Plate XIV. fig. 6.) 



Fulvous ; thorax with the middle portion raised, rounded, the 

 surface rugosely reticulate, with four small black spots ; elytra 

 deeply punctured, the anterior half piceous, the rest fulvous, tbe 

 disc with the usual strongly raised ridges, without tubercles. 



Mas. Tbe head smooth and shining, the clypeus with a long 

 triangular spike at each side. 



Length 5 millim. 



Mas. Head entirely irapunctate, flavous, shining, the vertex 

 with two short pointed teeth, the clypeus with a long spike at each 

 side, which is strongly widened at the base ; antennae entirely 

 fulvous; thorax with the middle portion strongly raised, round, the 

 posterior portion with a short sulcus at the middle, the entire 

 surface finely reticulate-rugose, with four small black spots, two at 

 each side ; scutellum piceous, smooth ; elytra with two strongly 

 raised ridges near the suture, which are joined at the middle by a 

 short transverse ridge, two other short costse are placed at the 

 sides from the base to below the shoulders, the posterior portion 

 of the elytra is also furnished with some short transverse costas, 

 the interstices deeply punctured, the suture finely serrate through- 

 out ; the pygidium longitudinally strigose and finely punctured ; 

 the abdomen nearly similarly sculptured; the breast strongly 

 punctured. 



Hah. Brazil. (Collection British Museum and my own.) 



The male of this species differs from every other in the two large 

 spikes of the clypeus, which are entirely absent in the female; 

 there is otherwise no other difference of importance in the sexes ; 

 the entirely smooth, shining, and im punctate head ^is another 

 character of rare occurrence in members of this group. 



Chlamts boliviana, sp. n. (Plate XIV. fig, 2.) 



riavous or fulvous, the base of the head, a spot at the anterior 

 part of the thorax, and the legs black, the middle portion of 

 the thorax feebly raised ; elytra foveolate-punctate, the anterior 



