CANARIAN COLEOPTERA. 65 



nally characterized the species, I have taken it occasionally (both in 

 Teneriffe and Palma) very much darker, — its subapical fascia being, 

 as it were, suffused over the entire surface of the elytra. I have but 

 little doubt that it is the insect referred by M. Brulle to the Trechns 

 littoralis of Dejean (^. e. the T. longicornis of Sturm) . 



Genus 36. PERILEPTUS. 



Schaum, Nat. der Ins. Deutsch. i. 663 (1860). 



99. Perileptus nigritulus. 



P. omnino P. areolato similis, sed vix major et minus nitidus (oculo 

 fortissimo armato grossius, prsesertim in elytris, alutaceus), paulo 

 magis pubescens, capite postice dilute rufescentiore ; elytris (limbo 

 postico pallido exeepto) totis nigris, paulo magis parallelis, inter- 

 stitiis vix minus convexis ; antennis paulo longioribus, robusti- 

 oribiis. — Long. corp. lin. 1-1 3. 



Perileptus nigritidus, Woll.,Ann. Nat. Hist (3rd series) xi. 216 (1863). 



Habitat Teneriffam, inter lapillos per marginem paludis cujusdam 

 parvse prope urbem Sanctse Crucis sitae copiose captus. 



Had I possessed but a few specimens to judge from, I should 

 scarcely have ventured to regard the present Perileptus as more than 

 a dark variety of the European areolatus ; but since I have no less 

 than 93 from which to compile my diagnosis, in the whole of which 

 its small differential characters remain perfectly constant, I am in- 

 duced to believe that it is truly distinct from (however nearly aUied 

 to) that insect. It may be known from it by being (on the average) 

 a trifle larger and more pubescent, just perceptibly less shining, and 

 (under a high magnifying power) more coarsely alutaceous ; by its 

 elytra (except their extreme apical margin) being always entirely 

 darlc, a little more parallel at the sides, and with their interstices 

 somewhat less convex ; by its head being rufescent behind ; and by 

 its antennae being perhaps rather longer and more robust. It is 

 possible indeed that it may be but a geographical modification of the 

 areolatus ; nevertheless, with the above-mentioned small differences 

 constant in 93 examples, I think it would scarcely bo safe to treat 

 it as such. The only spot in which I have taken it, is by the edges 

 of a very small pool at the head of the Barranco Santo, close to S*^ 

 Cruz of Teneriffe, — where, in June 1858, 1 obtained it in the greatest 

 profusion, from beneath stones and shingle. 



