222 Zoological Society. 



Long. corp. et rostri, 5 J lin. ; lat. 2^ lin. 



Hab. Valleys of Petorca. 



Rostrum about half as long again as the head, much dilated at the 

 apex, with three distinct carinae, and the two outer carina? converging 

 slightly towards the base of the rostrum ; between the carinae are 

 minute longitudinal rugae, but these are hidden by the numerous 

 small brownish hairs which cover this and other parts of the insect. 

 The head is thickly punctured, and there is a minute oblong depres- 

 sion between the eyes. The thorax is subquadrate, about one-fourth 

 broader than long ; the anterior margin is straight ; the sides are 

 slightly rounded, but nearly straight towards the hinder part of the 

 thorax ; the greatest width is at the anterior third ; the posterior 

 margin is straight, and the posterior angles are very nearly right 

 angles ; the upper surface is nearly flat, being but very slightly con- 

 vex, and thickly but rather finely punctured. The elytra are mode- 

 rately elongated, but little broader than the thorax, and moderately 

 convex above ; the sides are nearly parallel, being very little dilated in 

 the middle; the apical portion is rounded; they are punctate- stri- 

 ated, and the interstices are finely punctured; a series of small 

 blackish spots is observable on each of the striae ; on other parts the 

 very minute hairs which cover the elytra are brownish. 



Adioristus simplex. Ad. piceo-niger, pilis fuscescentibus tectus ; 

 antennis piceis ; rostro brevi, carinato, ad basin transversim im- 

 presso ; thorace rugoso-punctato, subcylindraceo, lateribus paulb 

 rotundatis ; elytris oblong o-ovatis, punctato-striatis, punctis ali- 

 quantb profundis, interstitiis fere planis et punctulatis. 



Long. corp. et rostri, 3 J lin. ; lat. If lin. 



Hab. Valleys of Petorca. 



A small species, about equal in size to Phyllobius alneti. The 

 rostrum short and stout, being but little longer than the head, is 

 furnished with a central carina and a carina on each side, which is 

 less distinct, and the space between these ridges has longitudinal 

 rugae, which are partially hidden by the scattered hairs which cover 

 this and all other parts of the body. The head is thickly punctured, 

 and the punctures are confluent ; a small oblong impression is ob- 

 servable between the eyes, and in front of the eyes is a transverse 

 depression, separating, as it were, the rostrum from the head. The 

 thorax is nearly cylindrical, broader than long, and slightly nar- 

 rower behind than near the fore-part ; the anterior and posterior 

 margins are straight ; the upper surface is thickly and rather coarsely 

 punctured, and the punctures are many of them confluent. The 

 elytra are of an elongated ovate form, convex, somewhat attenuated, 

 but rounded at the apex; punctate- striated, the punctures mode- 

 rately large and rather deep, and nearly joining each other; the 

 interspaces between the striae are nearly plane, indistinctly punc- 

 tured in parts and slightly rugose ; the minute but somewhat spiny 

 hairs which cover the elytra are not sufficiently abundant to hide 

 the sculpturing, and are semi-erect. 



A species of the present genus is contained in Mr. Darwin's col- 

 lection, which differs from either of the above : it is almost destitute 



