OXACIS. 153 
punctuation of the thorax and elytra, the latter with very dense fine silky pubescence.. 
The claws are toothed at the base as in O. lucana. The right mandible is armed on 
the inner upper side near the tip with a small tooth, as in O. dorsalis, Lec. In one 
example the vitte of the elytra are only separated by a narrow indistinct stripe. 
In the National Collection there is an example of a species very closely allied to 
this, but differing from it in having simple claws; it is from Pensacola and may be 
referable to O. teniata, Lec. 
( Rackotes) 
5. Oxacis mandibularis. (Tab. VII. fig. 10, 2.) 
Elongate, opaque, clothed with very fine short ashy pubescence ; the head and prothorax pale testaceous, the 
latter with a large patch on the middle of the disc, and the sides at the middle narrowly, infuscate; the 
elytra fuscous, with a discoidal stripe (starting from the middle of the base and gradually narrowing) 
and the suture testaceous. Head deeply sunk into the prothorax, finely and rather thickly punctured, 
sparsely so in front, the epistoma smooth, the eyes and the apical portion of the mandibles black, the latter 
largely developed (when closed, projecting far beyond the sides and apex of the labrum) and simple; 
antennex testaceous, joint 3 about as long as 1, 11 very feebly emarginate at the middle; prothorax about 
as long as broad, broader than the head, the sides rounded in front and converging from a little before the 
apex to the base, the disc flattened in the middle behind, and with a large oblique depression on each side 
anteriorly and traces of a smooth central line, the surface densely and finely punctured ; elytra punctured 
like the prothorax and without raised lines; beneath testaceous, densely and finely punctured ; legs 
testaceous, the claws toothed at the base. . 
Length 73 millim. (2.) 
Hab. Mexico, Presidio (Forrer). 
One example only of this distinct species was obtained. Closely allied to O. lucana 
and O. holosericea; but differing from these in the more largely developed mandibles 
and in having the head more deeply sunk into the thorax (much as in the European 
genus Probosca), the latter wider in front and broadest just before the apex. ‘The 
punctuation of the thorax and elytra is much finer than in 0. lucana, but a little 
coarser and less dense than in O. holosericea. The right mandible is not toothed on 
the inner upper side near the tip. The head is more deeply sunk into the thorax than 
in any of the allied forms. The last joint of the maxillary palpi is triangular, its inner 
and apical sides about equal in length. 
Alloxacts 
6. Oxacis pleuralis. — 
Probosca pleuralis, Lec. New Species Col. p. 166°. 
Hab. Nortu America, Florida 1.—Mexico (coll. F. Bates), Vera Cruz (Hége). 
This species, according to the description, would appear to be allied to 0. dorsalis; 
but to differ from it in the toothed claws, and in the elytra having only a submarginal 
fuscous vitta. ‘Three examples collected by Herr Hoge at Vera Cruz and another from 
Mexico in Mr. F. Bates’s collection differ thus from O. dorsalis, and they are very 
probably conspecific with Probosca pleuralis, Lec. ‘These Mexican specimens may also be 
distinguished from O. dorsalis by having the eleventh joint of the antenne unemarginate, 
BIOL. CENTR.-AMER., Coleopt., Vol. LV. Pt. 2, January 1890. xy 
