CANARIAN COLEOPTERA. 283 



From my having obtained but a single specimen, and that a fe- 

 male, of the present insect, and in like manner only a male of the 

 preceding one, I had at first irnagined, from their near resemblance 

 to each other, that they might perhaps be but the sexes of one spe- 

 cies ; nevertheless a closer examination shows an abundance of dif- 

 ferences which, I think, cannot possibly be sexual. Thus, the C. hes- 

 perus is rather the larger of the two ; its elytra are blacker, and less 

 rounded at the sides (being somewhat broader and more quadrate), 

 and have their striae more evidently pimctured ; and its limbs, parti- 

 cularly the antennae, are shorter and (although pale) of an obscurer 

 tint. My miique example was captured from amongst vegetation 

 on some wet rocks, at a high elevation, on the descent from the 

 Cumbre into the region of El Golfo, on the west of Hierro. 



From the fact of the C. Tiesperus and j^hytobioides having so strong 

 an affinity with the (nevertheless comparatively gigantic) lineato- 

 tessellatus of Madeira, and since the last insect appears to be attached 

 exclusively to the fohage of the flat Sempervivum patina, Lowe, which 

 studs the rocks in the damper spots of that island, I have little doubt 

 that both of these Canarian species wiU be found to have a similar 

 habit, and that they must consequently be searched for on the succu- 

 lent leaves of the Semperviva and Seda within the sylvan districts. 



Genus 190. ACALLES, 

 Schonherr, Cure. Disp. Meth. 295 (1826). 



In describing the following twelve species of Acalles I do not think 

 it necessary to give their sexual distinctions, which are the same (or 

 very nearly so) in all of them. In the males the rostrum is opake 

 and coarsely sculptured ; whilst in the females it is a trifle longer, 

 narrower, and more arcuate, as also more piceous and shining, and 

 much more lightly sculptured. 



457. Acalles argillosus. 



A. squamis argillosis et brunneo-albidis densissime nebulosus ; rostro 

 subrecto, ad basin ipsissimam minus conspicue exciso ; prothorace 

 postiee leviter angustato, ante medium setoso-bituberculato ; ely- 

 tris profunde punctato-striatis, postiee valde productis coarctatis, 

 ad apicem ipsissimum obtuse subbisinuato-truncatis, carinis inter- 

 ruptis nodulisque (praesertim post medium) instructis, ante apicem 

 fascia hastata pallidiore plus minus obscura ornatis ; tarsis latis, 

 valde squamosis. — Long. corj). lin. 3|^-4. 



Acalles argillosus, Schon., Gen. et Spec. Cure. iv. 327 (1837). 

 Tylodes scaber, Brulle, in Webb et Berth. (Col.) 72. pi. 1. f. 14 (1838), 



Habitat TenerifFam, intra canles Kleinic^ neriifolice?, DC, degens. 



