65 
compared with the elytra ; disk very uneven, the depressed parts 
coarsely punctured, the lateral tubercles prominent ; colour sooty. 
Elytra elongate* ovate, the broadest part being about two-thirds 
their length, the tip not perceptibly truncate; their surface is 
thickly punctured, and is furnished with a few small tubercles 
or ridges crested with hairs, as in the allied species ; the colour 
is sooty, with a few spots of white pile on the disk, sometimes 
forming a patch" near the apex. Beneath grey ; legs sooty, 
varied with grey ; base of the thighs pallid. 
Taken on slender dry twigs, in the suburbs of Santarem. 
Group LeiopodiruB, 
Genus Amniscus (Bej. Cat.). 
Besides the species taken to form the genus Leptostylus, the 
vague group standing in collections under the yet uncharacterized 
name of AmniscuSy Dejean, comprises others which might con- 
veniently bear this title, as they differ in many respects from 
the types of Leptostylus, These have an elongated and sub- 
depressed form, with the basal joint of the posterior tarsi equal 
to the two following united. They form a connecting link be- 
tween Leptostylus and Alcidioriy differing from the latter in having 
the elytra oblong without prominent shoulders, instead of the 
triangular form, broad and elevated at the base, which so well 
distinguishes Alcidion, The thorax is tubercular on the disk, 
as in Leptostylus, and its sides are simply prominent in the 
middle, without acute or spiniform lateral tubercles. The elytra 
are briefly truncated or rounded at the apex. The thighs are 
abruptly clavate. In the only species which I have been able 
to examine closely, the apical segment of the abdomen is conical 
and somewhat produced in both sexes ; but in the male both 
dorsal and ventral segments are truncated or slightly emarginated 
at the tip, whilst in the female the dorsal segment is obtusely 
pointed. 
Alcidion polyrhaphoides of White (Cat. Long. Col. Brit. Mus. 
p. 394, pi. 10. f. 6) may be cited as the type of the genus Am- 
niscus as here defined. In this and the species I have to de- 
scribe the basal joint of the antennae is abruptly clavate near the 
tip ; but it is doubtful whether this will prove to be a generic 
character, as some species of Alcidion also have the same feature, 
whilst their nearest allied species have the joint of the same 
shape as the generality of the Acanthocinitse. The joint, al- 
though abruptly clavate, is of the same relative length as in the 
rest of the allied genera, and it presents also, near the tip on 
the underside, the small dentiform process which is characteristic 
of the subtribe. 
I 
