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SOUTH ‘AMERICAN EUMOLPID®. 215 
finer at the base and middle than the sides; the elytra have a 
distinct though short depression, better defined in the 9 thang ; 
the carina in the latter gives the elytra a broad appearance, 
which is lacking in the other sex, and the punctuation is, as in 
many cases, very fine at the apex; in the ¢ the body below is 
- dull bluish black, sometimes tinged with metallic; the ? with 
the last abdominal segment compressed into a short carina ; the 
legs vary from rufous more or less coloured with cyaneous blue 
to nearly dull cyaneous bluish. 
The ¢ is shaped very much like the 2 of variabilis, Jac., 
except the antenne are not as short. The specimen upon which 
the small measure is based isa ¢ and almost wholly cyaneous 
blue below, and the carina is well marked almost to the shoulder, 
otherwise it seems the same. 
There are certain forms from Cachabe which I had originally 
separated as distinct, on account of the smaller size (5 mm.), 
less carinate elytra, which gives a somewhat different form, but 
for the present I put them all together. 
Alethaxius @nea, sp. Nov. 
Size of variabilis, Jac. ; elongate, parallel. Body below shining 
geneous, last abdominal segment rufous; above, shining, sneous 
bronze; head and thorax very lightly and finely punctate; elytra 
lightly punctate striate, the humeral interval obsoletely carinate- for 
the middle two-thirds of its length; legs rufous, the base and apex 
of femora brown, and tibia and tarsi more or less shaded with 
cyaneous brown. 
Type, ¢, Cachabé, low c., November, 1896 (Rosenberg). 
Length, 6°5 mm. 
Labrum and palpi yellow, jaws large and black, antenne 
slender, half the length of the body, yellow, most of the joints 
partly infuscate ; head convex, remotely punctate, thickly on the 
epistome, deeply transversely depressed, and with a longitudinal 
suleation running nearly to the back edge, but not very deep ; 
thorax convex, distinctly collared in front, and with a small wide 
fovea each side on the dise back of the middle; all the angles ~ 
prominent, sides strongly bisinuate, elytra noticeably transversely 
depressed, with somewhat raised scutellar area; the striate 
punctuation fine, but distinct to apex; 2 unknown. The smooth 
appearing bronze surface at once distinguishes this form. 
Alethaxius pallida, sp. nov. 
Elongate, parallel, shining, entirely castaneous yellow, or light 
brown; the apical joints of the antenne and jaws a little darker, eyes 
black ; head and thorax sparsely, finely and very remotely punctulate ; 
elytra finely striate punctate, the intervals faintly raised at the apex. 
Type, 2 ¢, Cachabé, low c., August, 1897 (Rosenberg). 
Length, 4 mm. 
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