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



versely, dark brown. Elytra moderately elongated^ wide at the 

 base, and narrowed thence towards the apex ; shoulders conically 

 produced, but apex of cone obtuse and not tuberculated ; surface 

 very roughly punctured near the base, more finely so towards 

 the middle, colour dark brown or blackish, thinly variegated 

 with greyish pile. Body beneath tawny brown ; abdomen in the 

 middle glossy blackish, and sides spotted with black. Legs 

 blackish, varied with tawny ; hind tibiae dilated near the apex ( ^ ). 

 Obydos, Lower Amazons. Similar in size and general figure 

 to H. Syrinx^ {Hesycha syrinx, Dj. Cat. and French collections), 

 but differing in the shape of the basal joint of antennae and in 

 the constricted thorax. 



Genus Jamesia, Jekel. 

 Jekel, Journal of Entomology, i. p. 259. 



This genus is distinguished from Hypselomus by the basal 

 joint of the antennae being very gradually thickened from the 

 base to the apex, not abruptly clavate, and by the third joint 

 being quite straight instead of crooked. The claw-joints of the 

 tarsi are quite as long as the three remaining joints taken to- 

 gether. The species have the same heavy figure and dull colours; 

 but the elytra are much more elongated, and less trigonal. The 

 genus is distinguished also by the large volume and subquadrate 

 form of the eyes. 



There seems to be scarcely sufficient difference to warrant the 

 separation of Jamesia from Clytemnestra (Thoms.)tj the larger 

 volume of the eyes being the only apparent definite character. 



* Hypselomus Syrinx. Subelongatus, brunneus vel nigricans, elytris 



utrinque vitta obscura obliqua pallidiore. Caput angustum, fronte 



impunctata ; tuberis antenniferis intus dente armatis. Antenna; cor- 



pore paulo longiores, articulis basi pallidioribus, articulo basali paulo 



incrassato. Thorax basi latus, antice angustatus, linea dorsali elevata. 



Elytra elongata, postice paulo attenuata, subtiliter punctata, brunnea, 



linea curvata mediana obscure fulva ; humeris prominulis, in carinam 



Isevem curvatam desinentibus. Corpus subtus fuscum. Pedes fusci, 



unicolores ; tibiis compressis. Long, '^^-b^ lin. $ $ . Hab, Rio 



Jaineiro. 



t Since the early part of the genus Hypselomus in this memoir was in 



print, I have found that Perty and Serville happen to have described the 



types of two distinct genera under the respective names of Hypsioma and 



Hypselomus. The latter genus is equivalent to Clytemnestra of Thomson, 



which therefore becomesja synonym. M. Thomson, in his later work, 



' Systema Cerambycidarum,' has adopted this change of nomenclature. 



The following rectification of synonymy is therefore necessary : — 



Gen. 1. Hypselomus, Perty, Delect. An. Art. Bras. 



z=Clytemnestra, Thomson, Class, des Cerambycides. 

 =Jamesia, Jekel, Thomson, Systema Cerambycid. (section). 

 Gen. 2. Hypsioma, Serville, Ann. Soc. Ent. Fr. iv. 



z=Hypselomus, Thorns. (Class, des Ceramb.) Bates {ut supra) 

 and authors, nee Perty. 



