ANOBIAD^E. 223 



eyes than any of the other species, it is nevertheless only in the 

 male that they are perfectly enormous. And the same applies, in a 

 great measure, to the maxillary palpus ; for although the females 

 have the ultimate articulation almost simply securiform, I now per- 

 ceive that in the opposite sex it is slightly scooped out, though less 

 so than is the case in the species afterwards enumerated. It is 

 probable therefore that all the Xyletini hitherto detected in the 

 Atlantic islands, except perhaps the flavicollis, would fall under 

 Duval's genus Metholcus ; but inasmuch as I have just shown that 

 the main feature on which his group was made to rest (namely, the 

 excavation of the extreme apex of the maxillary palpi) is not only 

 a variable one (according to the species and sex), but that it is 

 sometimes so feebly pronounced as to be barely traceable, I believe 

 that Metholcus cannot stand as a distinct genus, though its charac- 

 ters, as secondary ones, may properly be made use of for sectional 

 purposes. 



I. Palpi maxillares articulo ultimo leviter securiformi, integro. 



630. Xyletinus flavicollis. 



Xyletinus flavicollis, WolL, Append huj. op. 34. 



Habitat Canarienses (Grow.), in caulibus Euphorlice canariensis a 

 DD. Crotch nuper deprehensus. 



A remarkable little Xyletinus which was detected by the Messrs. 

 Crotch in Gomera, during their late Canarian campaign. Having 

 been found only within the rotten stalks of the Euphorbia canariensis, 

 it is in all probability attached exclusively to that plant. 



II. Palpi maxillares articulo ultimo valde securiformi, sed ad 

 apicem internum plus minus oblique-excavato. [Genus Metholcus, 

 Duval.] 



631. Xyletinus latitans. 



Xyletinus latitans, Woll., Ann. Nat. Hist. vii. 14 (1861). 

 , Id., Cat. Can. Col. 246 (1864). 



Habitat Canarienses (Lanz., Fuert., Ten., Gom., Hierro), sub cortice 

 Euphorbiarum arido laxo praecipue latitans. 



Attached to the Euphorbias of the Canarian archipelago, where 

 indeed we may be pretty sure that it is universal. In fact it has 

 already been detected in every island of the Group except Grand 

 Canary and Palma, in both of which however it must doubtless 



