220 Zoological Society. 



pale brownish colour ; in parts the scales are of a deep brown co- 

 lour, and in the middle is a longitudinal line, formed of whitish 

 scales ; besides the scales are some very minute, semierect, scattered 

 dusky hairs ; the sculpturing cannot well be seen, owing to the cover- 

 ing of scales, but the thorax appears to be very thickly though not 

 coarsely punctured. The elytra are oblong, about one-third broader 

 than the thorax ; the humeral angles are prominent and rounded ; 

 the sides nearly straight, and the apex rounded ; the surface is con- 

 vex, but somewhat depressed at the basal portion of the elytra ; punc- 

 tate-striated ; covered with pale brownish scales, having moreover 

 some very minute scattered spines ; the third and fifth interstices of 

 the striae on each elytron are slightly raised ; rather behind the middle 

 is an oblique deep brown patch, behind which the scales are white, 

 or nearly so ; a distinct angular tubercle is observable on each elytron, 

 at a short distance from the apex. The legs and antennae are brown, 

 and covered with minute palish hairs ; near the apex of each of the 

 femora is a whitish ring. 



In the collection ©f Mr. Bridges are several species of Curculionida 

 closely allied to Listroderes , but differing in having the antennae more 

 slender and elongated ; the club is very long, distinctly jointed, and 

 very slightly ^incrassated ; the legs are longer, and the body is covered 

 with minute hairs, or hair-like scales, whilst all the species of Listro- 

 deres examined by me have the body distinctly clothed with scales. 

 Moreover, in none of the insects under consideration do I find the 

 tubercles on the apical portion of the elytra, which are so common in 

 the Listroderes. Such differences, though readily seen, it is impossi- 

 ble to express by a generic term. I have determined to designate 

 this new genus by the name 



Adioristus*, nov. gen. 

 Antenna longae, tenues ; scapus ad apicem subincrassatus ; articuli 

 funiculi obconici, 1° longo ; clava elongata distincte triarticulata. 

 Rostrum capite fere duplo longius, crassiusculum, subarcuatum, ver- 

 sus apicem incrassatum, supra carinatum : mandibulae tenues paulo 

 elongatae. 

 Oculi subovati, subdepressi. 



Thorax transversus, pone oculos lobatus, supra subdepressus. 

 Elytra elongato-ovata, convexa, ad apicem rotundata. 

 Tarsi elongati, subtenues, subtus spongiosi. 



Adioristus punctulatus. Ad.niger,fusco-pilosus ; antennis, tibiis 

 tarsisque piceis ; rostro brevi, crasso, carinato ; thorace punctulato, 

 brevi subquadrato, antice angustiori, postice utrinque subemargi- 

 nato ; elytris oblongo-ovatis, convexis, punctato-striatis, interstitiis 

 alternatis maculis parvulis nigris atque albescentibus ornatis. 

 Long. corp. et rostri, 6^ — 8Jlin. ; lat. 2J — 3J lin. 

 Hab. Valleys of Petorca. 



The whole insect is covered with minute decumbent hairs, and 

 these are of an ashy-brown colour. The rostrum is stout, con- 

 siderably dilated at the apex, and about twice as long as the head ; 



* From dho^ioTos, undefined, &c. 



