24 PROCEEDINGS OF THE NATIONAL MUSEUM vol.66 



at middle, the lateral carina broadly rounded, not sharply defined 

 on top, and extending from the base near posterior angle parallel 

 with the margin to near middle, then turning 'arcuately to the lateral 

 margin, with which it is obsoletely connected; surface coarsely and 

 densely rugose, the rugae more or less transverse on the disk, but 

 becoming more irregular toward the sides, finely and rather densely 

 punctate between the rugae, and sparsely clothed with recumbent 

 pubescence, which is short on the disk, but becoming longer, denser 

 and more yellowish toward the anterior 'angles. Scutellum not 

 transversely carinate, nor strongly acuminate at apex ; surface finely 

 and densely reticulate. Elytra as wide as pronotum at base; sides 

 par'allel and feebly sinuate for a short distance behind base, broadly 

 arcuately constricted near middle, feebly expanded at apical third, 

 then feebly attenuate to the apex, which is deeply arcuately emar- 

 ginate, obsoletely dentate, and each elytron terminating in a long 

 acute spine at the lateral margin ; sides of abdomen broadly exposed 

 above; disk feebly convex, and each elytron with a rather shallow, 

 broad basal depression, and a broad obsolete longitudinal depression 

 along the sutural margin, which is scarcely elevated posteriorly; 

 surface densely and coarsely imbricate-punctate at the sides, but the 

 punctuation becoming finer in the sutural depression. Abdomen 

 beneath densely, finely, but not deeply punctate, the punctures con- 

 nected transversely by obsolete striae on the bas'al segments, very 

 sparsely clothed with short inconspicuous hairs, and with a large 

 densely pubescent spot at the sides of the segments; intervals obso- 

 letely granulose; first segment convex at middle, and without any 

 median depression; last segment broadly rounded at apex; vertic'al 

 portion of the first and second segments densely clothed with yel- 

 lowish pubescence; pygidium without a median carina at apex. 

 Prosternum coarsely, densely rugose, densely, irregularly punctate, 

 and rather densely clothed with short recumbent cinereous hairs; 

 prosternal lobe bro'adly rounded in front, obsoletely emarginate at 

 middle, and strongly declivous; prosternal process nearly parallel 

 to behind the coxal cavities, then strongly attenuate to the apex, 

 which is rather acutely rounded. Femora not armed with teeth on 

 inner margin. Tibiae slender, the anterior pair feebly arcuate and 

 rather strongly mucronate at the apex. Posterior tarsi longer than 

 the tibiae, and the first joint slightly longer than the following three 

 joints united. Tarsal claws similar on all feet, cleft at middle, the 

 inner tooth broad, onl}^ one-half as long as the outer tooth, and not 

 turned inward. 



Length, 11 mm.; width, 2.5 mm. 



Type locality. — Kosario (Lake Rogagua), Bolivia. 



ry/^e.— Cat. No. 26975, U.S.N.M. 



