INSECTA MADERENSIA. 167 



males, and with tlieir penultimate articulation, in both males and females, scarcely 

 smaller than any of those which precede it. The Silvani are insects peculiarly 

 liable to dissemination over the world through the medium of commerce, feeding- 

 on sugar and other saccharine substances, — amongst which however (since they are 

 more particularly indigenous to tropical climates) they are, in northern latitudes, 

 more frequently perhaps to be found dead than alive. Some of the aberrant 

 members of the group (represented by the S. advena in Madeira) are less restricted 

 in theu- modes of life, occurring in various kinds of stores, and being partially 

 attached even to farinaceous preparations and grain, — like some of the true 

 Cryptopliagl. 



136. Silvanus Surinamensis. 



S. subparallelo-elongatus angustus fuscus opacus, capite prothoraceque crebre et profunde piinctatis, 

 illo maguo, hoc tricarinato et dentibus sex lateralibus utrinque armato, elytris profimde sub- 

 striato-puuctatis, interstitiis alternis leviter elevatis, anteunis minus clavatis, pedibus rufo- 

 picescentibus. 



Long. Corp. lin. l^-ly. 



Dermestes Surinamensis, Lum. Syst. Nat. i. 2. bQ5 (1767). 



Anohium frumentarium, Fab. Mant. Ins. i. 39 (1787). 



Ips fntmentaria, Oliv. Ent. ii. 18. 10 (1790). 



Dermestes Q-dentatus, Fab. Ent. Syst. i. 232 (1792). 



Silvanus Surinamemis, Stepli. III. Brit. Ent. iii. 104 (1830). 



frumentarius, Sturm, Beutsch. Fna, xxi. 90. tab. 388. f. A. (18.51). 



Habitat urbem Funchalensem, in domibus et mercatorum repositoriis, illuc saccharinis introductus. 



S. elongated and narrow, subparallel (being very slightly narrowed anteriorly), less depressed than 

 the S. dentatus, reddish-brown, exceedingly pubescent, and opake. Head and prothorax ven' 

 deeply and closely punctured : the former large, wide at its base, and with the sides sinuous and 

 considerably raised in front of the eyes, which are small : the latter narrow and elongated, almost 

 equally attenuated before and behind ; with a straight central ridge down the disk, and an 

 incurved one on either side ; the lateral edges armed, each, with six teeth, — those constituting 

 the anterior and posterior angles being very long and acute. Elytra deeply substriate-punctate, 

 and with the alternate interstices elevated. Antenna less clavated at their apex than those of 

 either of the following species, Leffs bright rufo-piceous. 



A universally imported insect (though, in northern latitudes, never, I believe, in 

 a living state), amongst sugar and other articles of commerce, tlu'oughout the 

 civilized world, — and of constant occurrence in Madeira, under such circumstances. 

 It may be known by its narrow, elongated outline, by its largely-developed head, 

 minute eyes, and tricostate prothorax, and by its antennae being less distinctly 

 clavated than those of the allied species. 



137. Silvanus dentatus. 

 * S. parallelo-elongatus depressus fuscus vix opacus, capite prothoraceque crebre sed minus profunde 



