CANABIAN COLEOPTERA. 133 



227. Silvanus surinamensis. 



Dermestes surinamensis, Linn., Syst. Nat. i. 2. 565 (1767). 

 Anobium frunientarium, Fab., Mant. Ins. i. 39 (1787). 

 Dermestes 6-dentatus, Fah., Ent. Syst. i. 232 (1792). 

 Silvanus surinamensis, Steph., III. Brit. Ent. iii. 104 (1830). 



, Woll, Ins. Mad. 167 (1854). 



, Id., Cat. Mad. Col. 54 (1857). 



Habitat in Lanzarota, Fuerteventura, Canaria, Palraa et Hiei'ro, in 

 domibus, granariis et sub recremento farris circa basin acervorum 

 tritici sparso, certe introductus. 



This almost cosmopolitan insect has clearly been naturalized in 

 these islands through the medium of commerce, in like manner as it 

 has at Madeii-a. There can be no doubt that it is universal throughout 

 the archipelago ; nevertheless I happen hitherto to have observed it 

 only in Lanzarote, Fuerteventura, Grand Canary, Palma, and Hierro 

 (in the last of which it was also found by Mr. Gray). It is often 

 common about houses and granaries, but abounds more particularly 

 beneath the refuse around the base of corn- stacks ; in which situation 

 I have captured it in profusion at Haria, in the north of Lanzarote. 



228. Silvanus nubigena. 



S. angusto-elongatus, subconvexus, fusco-niger, dense flavescenti- 

 cinereo-pubescens ; capite prothoraceque rugose punctatis, hoc 

 sequah, angusto, subcylindrico, postice vix angustiore, ad latera 

 subrecto et distinete crenulato, angulis ipsis posticis obtusis sed 

 argute determinatis, penicillatis ; elytris rugose et dense seriatim 

 punctatis, versus humeros interdum paulo fuscescentioribus ; fe- 

 moribus piceis, antennis, tibiis tarsisque piceo-ferrugineis. — Long, 

 corp. lin. 1-1^. 



Silvanus nubigena, WoU., Ann. Nat. Hist. (3rd series) xi. 217 (1863). 



Habitat in editioribus aridis Teneriffae, inter lapillos ramulosque 

 emortuos sub arbusculis Spartii nnbigence humi jacentibus, velocis- 

 sime currens, necnon fere ad 9000' s. m. ascendens. 



In its general fades, colour, clothing, and outline, no less than in 

 its unfoveolated pro thorax and almost unclavated antennae, the pre- 

 sent very interesting and truly indigenous Silvanus has much in 

 common with the European S. elongatus ; nevertheless when closely 

 inspected it will be seen to differ in many respects from that insect. 

 Thus, apart from all other characters, it may immediately be known 

 from it by its much slenderer tarsi, the antepenultimate joint of 

 which is scarcely at aU dilated or bilobed. In minor respects it is 

 altogether a little smaller and narrower than the S. elongatus, its 

 coloui' (especially of the limbs) is considerably browner (its shoulders 



