6 
Psyche 
[March 
punctures; inner plica present and well developed. Under- 
side glabrous ; prosternal process glabrous, margined at 
apex; metepisterna short, very little longer than wide; ab- 
dominal segments sulcate and with series of deep punctures 
across base. Legs normal except for the hind tibiae of one 
species ; protarsi of male with first 3 segments strongly di- 
lated, triangular; basal segments of tarsi glabrous on the 
upper side, not sulcate or carinate externally; segment 4 
not emarginate ; onychium with a few setae beneath ; claws 
smooth. Aedeagus with the apical blade characteristically 
modified in the different species. 
Genotype: Sierrobius smaragdinus Straneo (below) 
Sierrobius could be considered a subgenus of the great 
genus Pterostichus ( sensu lato) , but the five new species I 
refer to it are very homogeneous generically, though very 
different from each other, and from other previously known 
species, and I prefer to consider it a distinct genus, confined 
to the Sierra Nevada de Santa Marta, Colombia. 
Key to the Species of Sierrobius 
1 (8) Size over 8 mm. ; hind angles of prothorax more 
or less blunt. 
2 (3) Striae of elytra strongly but irregulary impres- 
sed ; lateral margin of pronotum in anterior half 
always with 2-3 setae; aedeagus as in Fig. 3 
smaragdinus n. sp. 
3 (2) Striae of elytra either strongly but regularly im- 
pressed, or faint; lateral margin of prothorax 
in anterior half usually with a single seta. 
4 (7) Elytra with all striae faint throughout, except 
that 2 and 3 are lightly impressed in one species 
and 7 is always rather deeply impressed; basal 
angles of prothorax wholly rounded. 
5 (6) Size smaller (12 mm.) ; striae 2 and 3 slightly 
but distinctly impressed; extremity of stria 7 
deeply and irregularly impressed, with two con- 
spicuous setiferous punctures; aedeagus with 
apex strongly asymmetrical (Fig. 4) . .bistriatus n. sp. 
