1951] 
Straneo — American Pterostichini 
3 
the prothorax by the two last segments. Prothorax mod- 
erately transverse (3.4 by 4.3 mm.), with sides strongly 
rounded and narrowed anteriorly (width of apex 2.3 mm.), 
only a little rounded and nearly straight towards base (4.1 
mm.), which is wider than base of elytra; anterior angles 
obtuse, rounded ; basal ones raised, nearly square, not 
dentate; basal impressions much longer than in any other 
species of the genus, reaching % 0 f the length of the pro- 
thorax, very deep ; lateral margin narrow, with the two usual 
punctures; base impunctate, strongly depressed, as is the 
whole disc. Elytra oblong-oval (9 by 5.7 mm.), convex, with 
the sides slightly rounded behind the shoulders and widest 
near middle; shoulders square, dentate; striae deep, impunc- 
tate; interstices very convex, the sixth and seventh a little 
raised near shoulders. Prosternum with a moderate longi- 
tudinal groove; prosternal process not margined; met- 
episterna short; ventral segments strongly sulcate across 
base and with deep depressions at sides ; anal segment with 
one fovea on each side in $ and two in $ . Aedeagus with 
apical blade rounded, without apical spine. 
Holotype $ and 2 $ $ paratypes from Rio Confuso, 
Paraguay (from Institut Fabre, through Prof. Porta), in 
my collection; allotype 2 from Villarica, Paraguay (Mu- 
seum of Comparative Zoology, Type No. 28,440). 
This new species is colored like T. superba and f estiva 
Tschit. but belongs to the group of depressicollis Dej., with 
the tip of the aedeagus simply rounded, without spine. It 
differs from every previously known species of the genus 
by the very long, strong basal impressions of the prothorax, 
which reach three fourths the length of the prothorax, while 
in the other species they do not exceed half the length. 
Oxycrepis parvula, n. sp. 
Black shining, with apex of elytra slightly brownish; 
antennae with segments 1-3 ferrugineous brown, 4-6 darker, 
7-11 wholly white; ventral segments brownish, iridescent; 
anal segment ferrugineous. Length 5.6 mm. ; width 2.2 mm. 
Head elongate; eyes wide, moderately convex, temples very 
short; frontal grooves deep, wide, short; antennae long. 
