218 Zoological Society, 



face of the rostrum covered with distinct yellowish hairs. Head 

 thickly punctured, the punctures confluent, and with an impressed 

 point between the eyes. Thorax about one- third broader than long, 

 emarginated in front, nearly straight behind, but slightly indented in 

 the middle ; the broadest part of the thorax is about the anterior 

 third ; from this point it is contracted in width, both before and be- 

 hind, in nearly equal proportions ; the upper surface is nearly flat, 

 and very thickly and distinctly punctured ; the punctures more or 

 less confluent ; a faint dorsal ridge is sometimes perceptible ; small 

 spiny semierect hairs cover the thorax ; elytra moderately long, with 

 the humeral angles forming right angles; the apex rounded, the 

 width about one-fourth greater than that of the thorax ; the upper 

 surface moderately convex, covered with brown scales, and having 

 interspersed erect spiny hairs ; punctate- striated, the interstices very 

 finely shagreened ; the third, fifth, and the seventh from the suture, 

 raised ; a few black spots are irregularly scattered over the elytra, 

 and in some specimens are some whitish spots arranged in lines on 

 the apical portion of the elytra. 



From the collection of Mr. Bridges. 



Listroderes pilosus. Listr. niger, opacus, setosus, fusco-squa- 

 mosus ; antennis tarsisque fuscescentibus ; rostro indistinctissime 

 carinato ; thorace crebre punctato, subquadrato, lateribus subro- 

 tundatis ; elytris punctato -striatis. Capite, thorace, elytrisque 

 squamis fuscis atque nigrescentibus dense tectis. 



Long. corp. et rostri, 3^- lin. ; lat. lj lin. 



Hob. Valleys of Petorca. 



About equal in size to Sitonafusca. Rostrum a trifle longer than 

 the head, slightly rugose, and with a very indistinct longitudinal 

 carina. Head thickly punctured, the punctures confluent, and an 

 impressed line between the eyes. Thorax subquadrate, and some- 

 what depressed ; very thickly, but not coarsely punctured, the punc- 

 tures confluent ; the width greater than the length ; the sides nearly 

 straight and parallel, excepting near the base and apex of the thorax, 

 where the width is gradually contracted. Elytra but little wider 

 than the thorax, somewhat convex and elongated ; the humeral angles 

 rounded, and the apical portion rather attenuated, but with the tip 

 rounded ; the sides subparallel ; punctate- striated ; the punctures, of 

 moderate size, are rather close together ; the interstices of the striae 

 nearly flat, and apparently slightly rugose. 



The sculpturing of the rostrum, head, thorax and elytra is with 

 difficulty examined, all these parts being densely clothed with scales ; 

 these are chiefly of a brown colour, but in parts they are of a blackish 

 hue. On the thorax is an indistinct dusky line in the middle, and 

 one or two dusky patches at the sides ; the elytra are variegated with 

 deep and pale brown. 



From the collection of Mr. Bridges. 



Listroderes costirostris, Scho. Several specimens of this species 

 are contained in Mr. Darwin's collection, having been collected at 

 Maldonado; and there are, moreover, specimens collected at Co- 

 quimbo which present no distinguishing character, excepting in being 



