of the Amazon Valley.. =. Av 
mesosternum being plane instead of tumid, and also in the style 
of coloration, although agreeing in general form as well as in the 
shape of the tarsi. The genus 7rypanidius is unknown in the 
-Amazons region. 
Atrypanius conspersus, Germar. 
Lamia conspersa, Germar, Ins. Spee. 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. ¢ Q. 
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 Prosatius (Dej. Cat.), Thomson. 
Thomson, Ciassif. des Cérambye. p. 16. 
Body elliptical. Antenne 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- 
minal dorsal plate truncate and bidentate in both sexes; corre- 
sponding ventral plate obtuse, and, in the females, slightly 
notched. Elytra setose, even, briefly truncated and generally 
spined at the apex. Legs moderate ; thighs clavate ; tarsi short ; 
basal joint of the hind foot about as long as the two following 
taken together. 
This is one of the best-defined and most homogeneous genera 
in the host of variable forms constituting the group Leiopodine. 
The character drawn from the apical abdominal segment is 
seen to be constant here, bringing together species agreeing 
in facies and many other points, but greatly diversified in colours 
and markings. 
- 1. Probatius Chryseis, un. sp. . 
-P. ellipticus : capite thoraceque auratis: elytris viridibus sericeis, 
nigro setosis, apice mucronatis ; abdomine testaceo-rufo. Long. 
5-6 lin. 5 Q. 
Head and thorax shagreened, of a rich golden colour shading 
into green with the play of light, naked. Antenne black, setose ; 
thoracic spines large, acute, pointing obliquely rearwards, and 
placed very near to the hind angles. FElytra of a breadth nearly 
equal to three-fourths their length, thence narrowing to the 
apex, which, in each elytron, is prolonged into an acute spine ; 
