Zoological Society. 219 



of a larger size, viz. total length 5^ lines, width 2| lin. ; those from 

 Maldonado being 4j lines in length and 1 J in width. 



Listroderes ROBusTus. Listr. breviter ovatus, niger, opacus, 

 fusco-squamosus, setosus ; antennis fuscescentibus ; rostro longi- 

 usculo, carinato, pilis minutis decumbentibus tecto ; thorace crebre 

 punctulato, brevi, vittd albd ornato, lateribus subrotundatis ; elytris 

 breviter ovatis, punctato-striatis, fascid albescente, ad latera inter- 

 ruptd, ornatis, singulaflm tuberculo subapicali instructis. 



Long. corp. et rostri, 4^ lin. ; lat. 2J lin. 



Hab. Coquimbo. 



In size and form this species may be compared to the Phytonomus 

 punctatus. Rostrum about twice as long as the head, covered with 

 minute decumbent brownish hairs, and with a longitudinal carina. 

 Thorax rather broader than long, very suddenly contracted in front, 

 and broadest near the fore-part ; the sides slightly rounded, or nearly 

 straight ; the posterior angles rounded, and the posterior margin in- 

 distinctly produced in the middle ; the surface very thickly punctured 

 and covered with pale brownish scales, and having interspersed mi- 

 nute hairs ; in parts the scales assume a deeper hue, and in the middle 

 is a whitish line. Elytra about one- third broader than the thorax, 

 convex, and of a short ovate form ; punctate- striated ; the interstices 

 obscurely punctured, and slightly convex; they are covered with 

 brownish scales, and have interspersed minute pale hairs ; rather 

 behind the middle is a broadish curved mark, which is obliterated on 

 the sides of the elytra ; and towards the apex is a small angular tu- 

 bercle. 



From the collection of Mr. Darwin. 



Listroderes apicalis. Listr. squamosus, fusco-albescens ; an- 

 tennis piceis ; rostro carind longitudinali fused ; capite notis dua- 

 bus fuscis antice convergeniibus ; thorace antice quam postice la' 

 tiore, ad latera fere recto, antice foved incurvatd, lined albd lon- 

 gitudinali ; elytris thorace duplo latioribus, punctato-striatis ; sin- 

 gulis notd nigrescente obliqud, ad apicem albescente, tuberculo di- 

 stincto subapicali. 

 Long. corp. et rostri, 3£ ; lat. 1 J lin. 

 Hab. Monte Video. 



This species is considerably less than the L. costirostris , being about 

 equal in size to the Phytonomus rumicis. The rostrum is rather slen- 

 der, nearly twice as long as the head, covered with minute decum- 

 bent hairs, which are of a whitish brown colour ; in the middle is a 

 longitudinal carina. The thorax is broader than long ; the broadest 

 part is considerably in front of the middle ; in front it becomes some- 

 what suddenly contracted ; the sides of the thorax converge from near 

 the anterior part towards the base, and are nearly parallel ; the pos- 

 terior margin is slightly rounded, being produced in the middle ; the 

 hinder angles are obtuse ; the upper surface of the thorax is nearly 

 plane, presenting scarcely any convexity, and in the fore-part is a 

 curved impression, the extremities of which lead up to the anterior 

 angles ; it is densely clothed with scales, and these are of a very 



