182 
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 tibise 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 antennse 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 antennse 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.) f, 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. Antennse cor- 
pore paulo longiores, articulis basi pallidioribus, articulo basali paulo 
incrassato. Thorax basi latus, antice angustatus, linea dorsali elevata. 
Elytra elongata, ]30stice paulo attenuata, subtiliter punctata, brunnea, 
linea curvata mediana obscure fulva ; humeris prominulis, in carinam 
laevem curvatam desinentibus. Corpus subtus fuscum. Pedes fusci, 
unicolores ; tibiis compressis. Long. 4|-5| lin. <? $ • Hab. Rio 
Jaineiro. 
t Since the early part of the genus Hypselomus in this memoir was in 
]>rint, 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, 
whieh therefore becomes a 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. 
= Clytemnestra, Thomson, Class, des Cerambycides. 
zzzJamesia, Jekel, Thomson, Systema Cerambyeid. (section). 
Gen. 2. Hypsioma, Serville, Ann. Soc. Ent. Fr. iv. 
=Hypselomus, Thoms. (Class, des C6’amb.) Bates {ut supra) 
and authors, nec Perty. 
