1951] 
Straneo — American Pterostichini 
5 
margined at sides, evidently punctate at middle ; disc slightly 
convex, with median line rather deep but short. Elytra sub- 
rectangular (2.6 by 1.8 mm.) ; sides rounded just behind 
shoulders, thence parallel for % of length ; shoulders widely 
rounded; striae deep and well punctate; interstices moder- 
ately convex. Underside smooth; metepisterna twice as 
long as wide. Hind tarsi not carinate above; onychium 
glabrous beneath, nearly as long as the first segment. Aedea- 
gus as figured (Fig. 2). 
Holotype S (Museum of Comparative Zoology, Type No. 
28,438), allotype $ (in my collection), and one paratype 
(M.C.Z.) from Rio Frio (S. of Santa Marta), Prov. of Mag- 
dalena, Colombia; and 4 additional paratypes (M.C.Z. and 
my collection) from Aracataca (S. of Rio Frio). All speci- 
mens taken by P. J. Darlington. 
L. minimus is the smallest species of the genus. The 
small size and the color distinguish it at once. 
Sierrobius, n. gen. 
Not winged; glabrous. Head with clypeus bisetose; two 
supraorbital setae each side; supraorbital ridges regular; 
labrum transverse, 6-setose ; mandibles rather elongate, 
sharp, hooked at tip, the external scrobes without setae; 
mentum rather deeply incised, median tooth more or less 
prominent, excavated at apex, lightly incised in some 
species, truncate or rounded in others, lobes rounded at 
sides, apices of epilobes barely projecting as a short tooth 
on each side; ligula short, wide, apex bisetose; paraglossae 
narrow, membranous, with apical halves free; palpi with 
penultimate segments bisetose, the apical ones slightly at- 
tenuate and subtruncate at apex, apparently glabrous, but 
actually with a few very short, very thin setae; maxillae 
sharp, hooked at apex, inwardly fringed with bristles, outer 
lobe jointed; maxillary palpi with last segment fusiform; 
antennae rather short, pubescent from and including seg- 
ment 4. Prothorax with a setigerous pore near each basal 
angle and 1-3 such pores on each side in different species, in 
anterior half. Elytra with a basal margin, 9-striate, with a 
variable short scutellar stria between striae 1 and 2 and a 
setiferous puncture near base of 2; interstice 3 with 2-4 
