1901.] PHYTOPHAGOUS COLBOPTERA.. 157 



In coloration this species resembles somewhat C. ruhicimda 

 KoU. and allied forms, but may be known at once by the broad 

 discoidal purplish space below the scutellum ; the entirely flavous 

 antennae, the tubercles at each side at the top of the thoracic 

 elevation and its two dai'k fasciae, the design of the elytra, and, 

 most characteristic of all, the highly flavous ridges of the elytra 

 which connect their tubercles will separate the species from any 

 other. I may further add that in regard to the above ridges, those 

 most prominent run from the shoulders to below the middle, 

 where a small tubercle is placed at the sides and near the suture 

 in a transverse line, the rest of the tubercles are situated near the 

 apex at the base. There are four specimens before me, which 

 scarcely show any variation. 



Chlamts beasiliensis, sp. n. 



Flavous below, above obscure dark greenish, opaque ; thorax 

 closely and finely punctured, the posterior portion strongly raised, 

 deeply sulcate ; elytra finely and very remotely punctured, without 

 tubercles, the usual ridges distinct, transversely connected at and 

 below the middle, the intermediate spaces depressed ; legs flavous, 

 spotted with black. 



Length 4 millim. 



Head distinctly but finely punctured at the vertex, flat, the 

 emarginate portion of the eyes and the labrum and palpi flavous ; 

 antennae with the fifth and following joints transversely dilated, 

 blackish, the lower five joints flavous, the second and the following 

 three joints small ; thorax strongly raised at the middle, the 

 elevated portion sulcate at the top, the sides of the elevation 

 in shape of obsolete ridges, when viewed sideways, closely punctured 

 like the rest of the surface, the interstices not raised nor reticulate, 

 of an opaque blackish-green colour ; scutellum impunctate ; elytra 

 constricted below the shoulders, the suture finely serrate through- 

 out, each elytron with a short longitudinal ridge near the suture, 

 another one from the middle of the base to the apex, where it 

 curves round towards the lateral margin, and a third ridge from 

 the shoulder to the middle, where it joins the second one, other 

 short transverse ridges connect the longitudinal ones before and 

 below the middle, the interstices between them appear excavated 

 and are all sparingly punctured, the colour is that of the thorax ; 

 below bright flavous, the anterior femora and their tibiae with some 

 black spots ; pygidium flavous, obsoletely punctate. 



Hah. Rio Janeiro. 



This species is not difficult to recognize on account oE its 

 coloration, which would place it in Lacordaire's 5th group ; it 

 quite differs, however, in structural characters, as the antennae are 

 only transversely dilated from the sixth joint onwards, and there 

 are no tubercles visible at the elytra, only ridges. 



Chlamts insulaeis, sp. n. 



Pale flavous, the punctures piceous, thorax with the posterior 



