CANAKIAN COLEOPTEKA. 441 



had the surface of their elytra altogether a Httle more uneven ; but 

 the more or less maUeated sculpture is so variable that I attach but 

 slight importance to its development. 



The " var. /3," however, from Palma and Hierro may possibly be 

 the exponent of a nearly allied species (in which the elytra are still 

 more even, and a trifle more sparingly and finely punctulated) ; but 

 I believe that it is a mere insular state of the ohesus. 



673. Arthrodes byrrhoides, n. sp. 

 A. convexus, subopacus, A. inJJnto prima facie propinquans, sed patdo 

 minus convexus, prothorace ad latera minus rotundato et etiam evi- 

 dentius immarginato, elytris densius et multo subtilius granidatis 

 (granulis minutissimis, nisi oculo fortissimo armato observandis) et 

 plica humeraU distincta (nee obsoleta), parum incrassata. — Long, 

 corp. lin. 4|. 



Habitat Fuerteventuram, a meipso parce repertus. 



The two specimens from which the above diagnosis has been com- 

 piled were taken by myself in Fuerteventura, but I am not quite cer- 

 tain as to the precise locaUty. In their very convex body and com- 

 paratively uusculptured surface (the head and prothorax being most 

 minutely punctured, and the elytra, wliich are slightly malleated, 

 beset with infinitesimal, scarcely distinguishable, granules), they have 

 much the prima facie appearance of the A. injlattis ; nevertheless, 

 judging from the examples before me, the species would appear to be 

 rather smaller and less convex, and to have a conspicuous (though 

 short) humeral plica — which causes the extreme base of the elytra 

 to be a little wider than the extreme base of the prothorax. The 

 latter, also, is even stiU more decidedly immarginate ; and its elytral 

 granules are denser and (if possible) smaller stUl, being barely trace- 

 able even beneath a high magnifying power. Its humeral costa is 

 rather longer than in the obesiis, but not so long as in the members 

 of the following Section. 



674, Arthrodes laticoUis. 



A. praecedenti similis, sed nitidus, vix minus convexus, carina fron- 

 tal! magis elevata ; capite prothoraceque parcius minutissime punc- 

 tvdatis, hoc latiusculo, convexo, immarginato, ad angulos ipsissimos 

 posticos elytrorum basin sensim superante et ibidem sutura (inter 

 prothoracem et elytra) quasi in fissuram desiliente ; elytris multo 

 parcius minutissime granulatis (granulis aegerrime observandis), 

 paulo grossius sed parcius maUeatis, plica humerali crassiore (sc. 

 valde incrassata) sed, ut in iUo, brevissima. — Long. corp. Un, 4-4^. 



Erodius laticollis, BruUe, in Webb et Berth. {Col.) 63 (1838). 



Habitat Fuerteventuram, parum rarus. 



