308 Mr. H. W. Bates on the Longicom Coleoptera 



XXXIV. — Contributions to an Insect Fauna of the Amazons Valley. 



Coleoptera : Longicornes. By H. W. Bates, Esq. 



[Continued from p. 182.] 



Genus Xylomimus, nov. gen. 



Body cylindrical, narrow. Head vertical, or slightly inclined 

 backwards ; muzzle moderately elongated ; sides rounded ; fore- 

 head very slightly convex ; eyes small, lower lobe nearly circular. 

 Antennse moderately distant at their bases, with inner side of 

 antenniferous tubercles prominent and angular; basal joint 

 dilated almost from the base, and forming a thick, oblong club, 

 with the lower edge slightly waved ; third joint one-third longer 

 than the first, and also thickened nearly from the base, continu- 

 ing of the same thickness to the apex, furnished on the under- 

 side with a fringe of long bristles ; fourth joint slender, shghtly 

 thickened in the middle, and about one-half the length of the 

 third ; fifth to seventh joints each about one-half the length of the 

 fourth, slender (rest wanting). Thorax cylindrical, longer than 

 broad, and deeply wrinkled transversely; lateral tubercles in- 

 conspicuous. Elytra linear, obtusely rounded at the apex, sur- 

 face free from excrescences ; pro- and raeso-sterna plane. Legs 

 very short, thighs clavate, tibise broad ; claw-joint of the tarsi 

 as long as the remaining joints taken together. 



The species on which this genus is founded presents, from its 

 shape and style of coloration, a striking resemblance to a frag- 

 ment of a slender decayed branch. 



Xylomimus haculus, n. sp. 



X. angustatus, cylindricus, thorace transversim crebre ruguloso ; 

 elytris stria impressa suturali, apice singulatim obtuse rotundatis ; 

 corpora supra bfunneo, lateribus obscure ochraceo ; elytris pone 

 medium fascia lata flexuosa brunnea ochraceo lineata ; antennis 

 brunneis, articulo quarto flavo. Long. .5| lin. S ? 

 Head dingy ochraceous, front uneven, punctured ; vertex and 

 occiput ample, brown, streaked with rusty ochreous ; antenni- 

 ferous tubercles slightly prominent on their inner sides, and 

 leaving a small semicircular notch between them. Antennse 

 with the first and third joints dark brown varied with ochreous, 

 bristly, fringe of the third also dark brown, fourth joint yellow, 

 fifth, sixth, and seventh rusty brown. Thorax cylindrical, sur- 

 face covered with numerous, irregular, transverse wrinkles; 

 lateral tubercles small, conical, dark brown in the middle, with 

 three indistinct rusty-brown vittse ; sides each with an ochreous 

 vitta, below which is a broader brown vitta. Elytra linear, 

 shoulders not prominent, apex of each obtusely rounded; surface 

 slightly uneven, plane towards the base and more convex beyond 



