of the Amazon Valleys. - 119 
Elytra with short but strongly elevated and crested centro-basal 
ridges, the space between the two being also elevated and clothed 
with a silky fulvous-brown pile; the sides in the middle have 
each a very large depression: the surface of the elytra is punc- 
tate-granulate in rows, one of which runs straight along the disk 
on each side, continuous with the centro-basal ridge ; others are 
diverted out of their course by the lateral excavations, within 
which the surface is extremely irregular; the disk near the 
suture is irregularly punctured ; towards the apex are some cle- 
vated lines; the disk is naked and shining: the colour is gene- 
rally nearly black, in some specimens silky brown of various 
shades ; there are also numerous very slender silvery-white lines, 
two of which, more conspicuous, oblique on the disk, form an 
inverted V. Body beneath and legs dark brown, covered with a 
slight pile, and varied with paler shades. Anterior femora 
dilated ; tibize curved and grooved on the inner side. Antenne 
capilliform. In the male the apical ventral segment is simple ; 
in the female it has a large deep transverse fovea near the apex. 
This species I met with at Para, at Obydos in Brazilian Guiana, 
and at Santarem ; it is found also at Cayenne. I have received 
it from M. Depuiset, of Paris, as M. ruficornis, var. I think 
there can be no doubt it is the Lamia antennator of Fabricius ; 
his description (somewhat better than the Fabrician descriptions 
usually are) seems to suit our insect sufficiently well. 1 have 
thought it better to give a more detailed description, for the 
sake of fixing the Fabrician name with more precision. The 
white lines are faint or wanting in some examples. 
2. Aithomerus rufescens, n. sp. 
4i. elongatus, tomentosus, brunneo-ferrugineus : elytris inzequalibus, 
basi elevatis, omnino brunneo-tomentosis: antennis pedibusque 
ferrugineis. Mas segmento ultimo ventrali apice fortiter bisinuato ; 
foemina latet. Long. 4 lin. 3. 
Head rufous brown. Thorax tuberculated asin . antennator, 
clothed with rusty-brown pile, faintly punctured. LElytra with 
short but strongly elevated and crested centro-basal ridges, the 
space between them being slightly elevated; the sides in the 
middle have each a very large depression; the surface of the 
elytra along the discal portion is impunctate, being clothed with 
pile, and there is no line of granulations in continuation of the 
centro-basal ridge: the strongly flexuous line along the disk is 
present, the lateral ones are broken and confused within the ex- 
cavation, as in 42. antennator ; the whole surface is rusty tomen- 
tose and opake ; there are indications of white lines in the same 
position as in the preceding Species. Body beneath, legs, and 
antenne ferruginous red. The apical ventral segment in the 
