Mr. H. W. Bates on the Longicorns of the Amazon Valley. 275 



are lacunae occur in the form of large regular vessels, but slightly 

 anastomotic, or otherwise they constitute a network with ana- 

 stomoses more or less numerous and meshes in considerable 

 though varying number and regularity of arrangement. Lastly, 

 the reservoirs may be nothing more than irregular cavities pro- 

 duced by laceration. 



XXVII. — Contributions to an Insect Fauna of the Amazon Valley. 

 CoLEOPTERA : LoNGicoRNEs. By H. W. Bates, Esq. 



[Continued from p. 109.] 



Genus Lophopceum, nov. gen. 



Head, antennae, and general shape of the body as in Alcidion. 

 The thorax differs from that and the allied genera in being 

 armed near the centre of each side with an acute tubercle or 

 spine. The surface of the thorax is generally smooth on the 

 disk, but is in some species slightly uneven. The elytra are 

 subtrigonal in shape and depressed as in Alcidion ; the shoulders 

 are moderately prominent, and in most species a lateral carina 

 extends thence towards the apex, but, as in Alcidion, this be- 

 comes very obtuse or almost obliterated in some of the species. 

 The apex of the elytra is more or less truncated and spined, and 

 the centro-basal ridges are always prominent, although uncon- 

 nected posteriorly with a dorsal carina, the disk of the elytra 

 being always even. The ovipositor is not exserted in the females, 

 nor is the apical segment of the abdomen produced. The thighs 

 are thickly and abruptly clavate, and the tarsi very moderate 

 in length. 



1. Lophopceum carinatulum, n. sp. 



L. curtulum, minus depressum, postice rotundato-attenuatum, fusco- 

 ferrugineum, nigro-fusco maculatum : elytris lateribus hand cari- 

 natis, carina centrobasali parum elevata nigro setosa, disco plagis 

 tomentosis ochraceis variegate. Long. 3|- Tin. 



Head rusty brown. Antennae rust -coloured, base of each 

 joint (from the third) paler; the basal joint somewhat evenly 

 clavate, the upper side being convex, and the lower scarcely 

 flexuous, but tubercled at the apex. Thorax rusty brown, varied 

 with dingy ochreous ; the lateral spine quite central and acute. 

 Elytra less depressed than in allied species, and attenuated 

 curvilinearly to the apex, which is briefly and obliquely trun- 

 cated, and without acute angles to the truncation : there is no 

 lateral carina, and the centro-basal ridge is only moderately 

 raised, but is crested with black hairs ; the surface is thickly 

 punctured, except near the apex, and is without raised lines or 



