496 CANARIAN COLKOPTEEA. 



741. Gnathocerus comutus. 



Trogosita cornuta, Fab., Ent. Si/st. Suppl 51 (1798), 

 Uloma coruuta, BruUe, in Webb et Berth. {Col.) 70 (1838). 

 Cerandria cornuta, Wall., Ins. Mad. 490 (1854). 

 , Id, Cat. Mad. Col. 151 (1857). 



Habitat in Fuerteventura, Canaria, Teneriffa, Gomera et Hierro, in 

 domibus offieinisque pistoriis, ex alienis introductus. 



This insect will probably be found to occur pretty generally in gra- 

 naries and about bouses, being (like the TriboUum ferrugineuni) sub- 

 ject to constant introduction amongst fai'inaceous substances and 

 other articles of commerce. I have taken it in Fuerteventui'a, Grand 

 Canary, and Hierro ; and it was found in Teneriffe and Gomera by 

 Dr. Crotch. Being (as in Madeira) a mere importation from more 

 northern latitudes, it has but little significance in our present fauna. 



Genus 279. TRIBOLIUM. 

 MacLeay, Ann. Jainm. 47 (1825). 



742. TriboUum ferrugineum. 



Teiiobrio ferrugineus. Fab., ^ec. Ins. i. 324 (1781). 

 Triboliuin castaneum, MacLeay, Ami. Javan. 47 (1825). 



ferrugineum, Woll, Ins. Mad. 491 (1854). 



, Id., Cat. Mad. Col. 151 (1857). 



Habitat in Fuerteventura, Teneriffa et Gomera, certe introductura. 



Like the Gnatliocerus comutus, this insect is almost cosmopolitan, 

 being liable to introduction, in civilized coxuitries, amongst various 

 articles of food and commerce. Although occasionally abundant at 

 Madeira, it appears to be scarce at the Canaries, — Fuerteventura and 

 Teneriffe (in the latter of which it was likewise taken by the Barao 

 do Castello de Paiva) being the only islands in which I have myself 

 observed it. It was, however, captured by Dr. Crotch in Gomera ; 

 and in all probability it will be found to be universal, if searched for 

 in the warehouses and towns*. 



Genus 280. PSEUDOSTENE. 

 WoUaston, Ann. Nat. Hist. vii. 247 ( 1861). 



* In every diagnosis to wliich I have had access (including my own, in the 

 'Ins. Mad.') the sexes of Triholmm. arc regarded as jserfectly similar (externally) 

 infer se. But an accurate inspection has lately convinced me that such is not, in 

 reality, the case,- — one of them (which I presume to be the male) being not only 

 less opake and with its prothorax appreciably narrower behind, but having like- 

 wise its genffi just perceptibly more prominent and angular in front of either eye, 

 and its antennal club much less abrupt, or more gradually iovvneA (occasioned by 

 the subclaval joint, or joints, being wider). 



