198 ]\Ir. D. Sharp's Confrihu(ion.<! to the 



shilling black, the wliolc of the middle part impunctatc, 

 a row of coarse jninctures at the back, two other coarse 

 punctures near the inner hind ano:le of the eye, and anotlier 

 on each side between the eyes, the sides behind the eyes 

 with finer punctures ; the under surface is also iinpunc- 

 tate, except at the sides. Thorax a little narrower than 

 the elytra, slio-htly narrowed behind, not twice as long as 

 broad; black, shining- and im])unctate, except a few punc- 

 tures near the front angles. Scutellum with four or five 

 coarse punctures. Elytra not quite so long as the thorax, 

 dark shining blue, rather coarsely punctured. Hind body 

 shining bhick, hind portion of the 6th and the whole of 

 the 7th segment dark reddish, sparingly punctured. Legs 

 pitchy black ; tarsi slender. 

 Ega ; one specimen. 



.'i. Linidius extremit.t, n. sp. Niger, nitidus, elytris 

 cyaneis fortiter punctatis, ano rufo-testaceo ; capite lato, 

 fere circulari, lateribus et vertice punctatis, utrinque pone 

 oculos punctis tribus majoribus. Long. corp. 7 lin. 



This insect so greatly resembles the L. tenviprs, that a 

 reiterated description is useless. In L. extrcmus the head 

 is broader, more curved at the sides, and so more cir- 

 cular in form ; the punctures at the side of the head are 

 more closely packed, and on each side, just liehind and 

 internal to the eye, are three larger punctmes, ])]aced near 

 to one another, so as to form a tnangle. The extreme 

 vertex, as in L. tenuipcs, bears s])ai'ing coarse punc- 

 tures. The basal portion of the mandibles is more slender 

 than in L. tenuipcs, and the legs and tarsi are even a little 

 more slender than in that species. 



Upper Amazons; a single individual found by Mr. Bates. 



Xantiiolixus. 



Under this generic name there arc at present ]ilaced 

 sometliing more than one hundred s])ecies, found in all 

 parts of the world. I enumerate here icn .Vmazoniau 

 species, seven of which are new; but I have no doubt the 

 species to be fjuiid in this rich valley are very much more 

 numerous than this. The genus at present contains a 

 number of very dilhivnt forms, some of which have been 

 considered by some authors as distinct genera, but have 

 not been generally received as such at ])resent. About 

 thirty species from South America have been as yet de- 



