105 
widening from the front to the tips of the lateral spines, which 
are small, conical, and placed behind the middle. Abdomen in 
the male with the apical dorsal plate notched or entire ; ventral 
plate truncated and terminating in two stout teeth, like the 
dorsal plate of Probatius, In the female the apical abdominal 
segment is prolonged as a conical or short tubular sheath to the 
ovipositor, the dorsal plate tapering into a very sharp point, and 
in some species acutely carinated on its upper surface; the 
ventral plate is simply truncated in the female. Legs moderately 
short and stout ; thighs abruptly clavate ; tarsi short, even in 
the hind legs, much shorter than the tibise, but the first joint 
slender and longer than the two following taken together. 
This genus, although closely allied to Probatius, is distin- 
guished at once by the bidentation of the apex of the abdomen 
existing on the ventral instead of the dorsal plate; but this 
is seen in the males only, the females differing from the same 
sex in Probatius still more widely — namely, by having an ex- 
serted ovipositor and a prolonged pointed dorsal plate, instead of 
a bidentated one. 
1. Oxathres navicula, n. sp. 
O. ellipticus, rufescenti-fuscus vel obscure fuscus : thorace dorso 
coiivexo, Isevi, spinis lateralibus brevibus conicis mox pone medium 
sitis: elytris granulato-punctatis, lineis intermptis cinereis apice 
peroblique truncatis, angulis interioribus obtusis, externis sub- 
acutis. Long. 3| lin. d* $ . 
Head dusky. Antennae reddish, with a few short stiff hairs 
both above and beneath the joints, especially at their apices. 
Thorax convex, smooth, reddish brown, sometimes with a faint 
ashy vitta on each side, the lateral spines forming simply conical 
protuberances on the sides, a little behind the middle. Elytra 
strongly narrowed posteriorly in the d , more ovate in the 2 1 
obliquely and obtusely truncated at the tips ; surface with nu- 
merous punctures, each surmounted by a raised point, dull red- 
dish or dark brown, with scanty ashy pubescence arranged 
partly in interrupted lines. Body beneath and legs dull reddish 
brown or blackish, shining, scantily clothed with ashy pile ; legs 
hirsute; basal joint of the hind tarsi as long as the three re- 
maining joints taken together. 
d The apical abdominal segment in the d is greatly elongated, 
at least the ventral plate, with the angles of the apex acute ; the 
dorsal plate is much shorter and deeply notched. 
? The ovipositor projects beyond the tips of the elytra ; 
apical dorsal plate with raised margins and a sharp keel running 
into a prolonged point. 
Para and Santarem, on slender dead branches. 
M 
