146 Zoological Society. 



furrows, and here they are much less strongly marked. The lateral 

 keel in E. ebenina presents a nearly even line, but in E. Bonariensis 

 the keel is distinctly indented ; the sulci on the thorax are less 

 strongly marked and more numerous. 



Seven specimens of this species occur in Mr. Darwin's collection. 



Epipedonota lata. Epip. atra, nitida, lata ; capite punctis disper- 

 sis antice, apud medium sulco transverso, et postice sulcis panels 

 obliquis ; thorace sulcis, his obliquis, illis apud medium longitudi- 

 nalibus, illis margini proximis transversis, insculpto ; elytris con- 

 vexis costis latis paulb elevatis postice subobliteratis, spatio inter 

 costam secundam et carinam externam, sulcis profundis transversis 

 notato. 



Long. corp. 9| lin. ; lat. 6 lin. ; vel, long. 8f lin. ; lat. 5 lin. 



Hab. Port Desire. 



This species is larger and proportionally much broader than E. 

 ebenina. The thorax, in proportion to the size of the insect, is much 

 broader than in any other species of Epipedonota here described, the 

 width being nearly equal to two -thirds of the length of the elytra ; 

 whereas in E. affinis, which I have described as a shorter and broader 

 species than E. ebenina, the width of the thorax is scarcely more than 

 equal to half the length of the elytra. 



The head is punctured in front and has some waved transverse 

 grooves and ridges between the eyes. The thorax is about twice as 

 broad as long, emarginated in front nearly in the form of a segment of 

 a circle ; the lateral margins are rounded ; it is widest a little behind 

 the middle and narrowest in front ; the anterior and posterior angles 

 are acute ; the upper surface is nearly flat, but the lateral margins are 

 slightly reflected ; the anterior mesial portion is a little convex, and 

 the posterior mesial portion is sometimes slightly concave ; the whole 

 surface is covered with narrow grooves and ridges ; those on the dor- 

 sal part of the thorax are longitudinal but slightly irregular, towards 

 the sides they are oblique, diverging slightly behind, and a broadish 

 space at the sides is covered with sub -transverse grooves, these being 

 directed inwards and slightly upwards from the lateral margin. 

 The width of the elytra, as compared with the length, is as 4 to 5 ; 

 their upper surface is convex, excepting at the base, where they are 

 somewhat depressed : on each elytron are three longitudinal narrow 

 grooves, these are distinct and wavy at the base of the elytra ; the 

 first groove, or that nearest the suture, is obliterated on the hinder 

 half of the elytron ; the second is continued nearly to the apex, but 

 from the base it becomes gradually less distinct ; the third extends 

 to the apex, and forms as it were the outer boundary to the convex 

 portion of the elytra for the space between the last-mentioned line 

 and the lateral keel, which is nearly equal in width to one-third of 

 that of the elytron, is nearly flat, or even slightly concave in the 

 males ; on this space is a series of deep transverse indentations, lea- 

 ving convex interstices of a width corresponding to that of the grooves. 

 The two interspaces between the first, second and third striae of 

 each elytron are very broad and slightly convex ; and on the second 

 or outermost of these interspaces are a few oblique furrows, which are 

 not very distinct, and for the most part rather widely separated. Be- 



