1955] 
Valentine — Macrocephalus bidens 
99 
paniola; however, Olivier mentions nothing which might 
help to decide between them. The two are differentiated 
by the presence of a tarsal spine, long male antennae, and 
emarginate eyes in Toxonotus, while N eanthribus has no 
tarsal spine, short male antennae, and truncate eyes. Of 
these, the tarsal spine is not visible on the plates, but 
neither was it mentioned in the original description of 
the generitypic species of Toxonotus, T. fascicularis. As 
a matter of fact, it was not mentioned at all until 1866, 
thirty-three years after Schonherr’s description of fas- 
cicularis, and seventy-one years after the description of 
bidens. The antennae, as figured, could be those of Nean- 
thribus or a female Toxonotus, and the eyes are so poorly 
illustrated that it is difficult to be certain of their shape, 
although one gets the impression that they might be entire. 
Since there are no diagnostic generic criteria available, 
the only recourse is to attempt identification of the species 
bidens itself. The written description is again useless, but 
Olivier’s plate shows a unicolored brownish insect, with 
the exception of the pale declivity of the elytra, paler head, 
and slender, hairy, red legs. I know of no N eanthribus 
species which fits this description; however, a few weeks 
ago, I gave a manuscript name to a species of Toxonotus 
from Hispaniola which, at the time, I thought was un- 
described, and which matches this color scheme perfectly. 
I haven’t the slightest doubt that this species is, in reality, 
Olivier’s bidens, and it should therefore be known as Toxo- 
notus bidens (Olivier), new combination. 
In order to avoid any possibility of confusion, the fol- 
lowing review of Toxonotus is presented. 
Genus Toxonotus Lacordaire, 1866 
Toxonotus Lacordaire, 1866, Gen. Coleop. vol. 7, p. 575. 
Generitype: Anthribus fascicularis ‘Schonherr, 1833, by 
original designation and monotypy. 
As far as known, this is the only genus in the world 
fauna which has a long, slender spine on the dorsal, apical 
margin of all first tarsal segments. This spine extends 
half-way over the second segment, and is sometimes par- 
tially obscured by long pubescence. To my knowledge, 
there is only one other anthribid which ever has a spine 
