101 
Genus Atrypanius, nov. gen. 
Body oblong- oval or elliptical, convex. Head with the front 
elongated; eyes oblong. Antennse not much longer than the 
body, and nearly naked. Thorax as in Trypanidius — namely, 
slightly uneven on the surface, widening from {he front to the 
tips of the lateral spines — which are short, conical, and acute, 
not curved posteriorly, and placed not much after the middle of 
the thorax. Elytra with centro-basal ridges not conspicuous ; 
obtuse at the tip, naked. Feet very stout ; thighs strongly 
clavate ; basal joint of the tarsi short, scarcely longer than the 
second. Mesosternum simple. Dorsal and ventral plates of the 
apical abdominal segment obtuse in the male : ovipositor in the 
female very short, scarcely apparent beyond the tips of the elytra, 
the dorsal plate broadly rounded at the tip, the ventral truncated. 
The present genus is founded on Lamia conspersa of Germar, 
a species which differs from all the allied genera, except Trypa- 
nidius, in the shortness of the basal joint of the tarsi. The ob- 
tuseness of the apical abdominal segment in both sexes, the 
shortness of the ovipositor in the female, and the elongation of 
the eyes and forehead, also distinguish it from most of the groups 
to which it is in other respects most nearly related. It differs 
from Trypanidius (besides the elongation of the eyes) in the 
mesosternum being plane instead of tumid, and also in the style 
of coloration, although agreeing in general form as well as in {he 
shape of the tarsi. The genus Trypanidius is unknown in the 
Amazons region. 
Atrypanius conspersus, Germar. 
Lamia conspersa, Germar, Ins. Spec. nov. p. 474. 
A. ellipticus, griseus, carneo nigroque conspersus : capite carneo-fulvo, 
fronte grisea : elytris plaga irregulari pone medium alteraque api- 
cali griseis nigro maculatis, apice breviter oblique truncatis. 
Long. 4-6 lin. S 2 • 
The species has a wide range, being found near Rio Janeiro, 
on the Upper Amazons, and in Mexico. I see no difference in 
specimens which I have compared from all these widely distant 
countries. 
Genus Probatius (Dej. Cat.), Thomson. 
Thomson, Classif. des Cerambyc. p. 16. 
Body elliptical. Antennse scarcely one and a half times the 
length of the body, furnished with short stiff hairs, some of 
which are arranged in whorls around the tips of the joints. 
Thorax slightly convex, its outline curvilinearly widening from 
the front to the tips of the lateral spines, which are placed near 
the hind angles ; ovipositor not produced in the females ; ter- 
