288 CANARIAN COLEOPTERA. 



Known from the A. xeramjieUmis by its more ovate outline, and 

 by the apex of its elytra being less drawn out, or produced ; by its 

 rather more variegated hue, the less rufescent colour of its darker 

 scales, and \>j its paler ones being spread over a larger portion of its 

 surface (including more or less of the basal region of its elytra) ; by 

 its interriipted ridges being a little more developed ; and by its post- 

 medial fascia not being produced forward (in a straight line) on 

 either side. Like that species, its surface is comparative?)/ free from 

 setiB, and its prothorax is but very slightly narrowed behind. The 

 two specimens from which the above characters have been compiled 

 were both taken in the sylvan districts of Teneriife — one of them at 

 Las Mercedes, and the other in the laurel-woods above Taganana. 



462. Acalles sigma, n. sp. 



A. squamis nigro-brunneis et (prajcipue) nigrescentibus densissime 

 tectus ; protliorace postice angustato (ad latera rotimdato), ante 

 medium leviter setoso-bituberculato ; elytris postice coarctatis, 

 apice obtusis, carinis interruptis nodulisque duobus pone medium, 

 omnibus setosis, instructis, pone medium fascia magna (postice in 

 medio fasciculo elongato suturali nigrescente terminata) necnon 

 ante medium utrinque macula parva albido-ornatis ; pedibus elon- 

 gatis, squamoso-variegatis. — Long. corp. lin. 2g. 



Habitat in lauretis editioribus Palmte, rarissimus. 



Judging from the two examples now before me, this Acalles is 

 rather larger than any of the other species here enumerated except 

 the argUlosus, ceonii, and vemicosus. They were both of them taken 

 in the laiirel-districts of Palma ; and the species seems to be remark- 

 able for the dark, or blackish-brown, scales with which it is densely 

 clothed, and for the very thick and almost snowy-white postmedial 

 fascia of its elytra, which (in addition to having their interrupted 

 ridges, or nodules, a good deal developed and setose) have likewise 

 a small spot of paler scales, on either side, before the middle. Its 

 elytra (which have an elongate sutural fascicle of darker setne ad- 

 joining the centre of the hinder edge of their fascia) have their punc- 

 tures large and deep, and the extreme apex of their constricted por- 

 tion obtuse. 



463. Acalles senilis, n. sp. 



A. squamis cinereis densissime nebulosus ; prothorace postice angus- 

 tato (ad latera valde rotundato), ante medium leviter setoso-bitu- 

 berculato ; elytris postice coarctatis, apice obtusis, carinis inter- 

 ruptis nodulisque duobus pone medium, omnibus setosis, instructis, 

 pone medium fascia vix albidiore (antice in medio sat argute ter- 

 minata, sed postice suffusa) ornatis ; pedibus breviusculis, squa- 

 moso-variegatis. — Long. Corp. lin. 2. 



