Revision of Trechus 
57 
ed, sides scarcely sinuate before angles. Externally 77 uncifer can usually 
be distinguished from 77 barben by the following combination of charac- 
ters: Color of body and appendages more contrasting; head, pronotum, 
and elytra dark piceous to black, appendages rather pale, testaceous, 
outer segments of antenna not darker than basal segments; femora 
slightly infuscated, and tibiae and tarsi paler. Pronotum sides convergent 
without trace of sinuation; hind angles obtuse. Eye small, its short 
diameter less than length of scape. 
I have collected 77 uncifer only under rocks in damp places, usually near 
seeps or small springs. It is apparently never abundant, with only one to 
four specimens occurring in the same spot where large numbers of 77 
luculentus or 77 valentinei are found. 
Trechus ( Microtrechus) satanicus Barr 
Barr 1962, Fig. 17. Type locality, Graveyard Fields, Haywood County, 
North Carolina; type deposited in USNM. 
Superficially similar to T. uncifer , this species is known only from the 
west end of Graveyard Fields near Devils Courthouse, in the Great 
Balsam Mountains. It has not been taken farther west in the Balsams, nor 
on Pisgah Ledge to the east, despite careful search. Trechus satanicus is 
notable for the comparatively great length of the aedeagus, 1.47-1.49 mm 
long, despite the small body size (length 3. 2-3. 5 mm). Within the uncifer 
group, T. uncifer and T. satanicus form a subgroup and may be vicar 
species. The remaining species, T. aduncus and T. talequah , form another 
subgroup. Although T. satanicus lies within the range of nominate aduncus , 
the two species have not been collected syntopically. 
Trechus ( Microtrechus ) aduncus aduncus Barr, new status 
Fig. 32 
Trechus ( Microtrechus ) aduncus Barr 1962:82. Type locality, Mt. Pisgah, 
Haywood County, North Carolina; type deposited in USNM. 
Trechus aduncus is a medium-small (3. 1-3.9 mm) species with eye 
diameter equal to or slightly less than the scape length, the pronotum 
0.65-0.70 times as long as wide, pronotum apex and base widths sub- 
equal, the sides not or very feebly sinuate just before the small, right or 
slightly obtuse hind angles, the elytra with three inner striae clearly im- 
pressed and one to three additional, feebly impressed outer striae. The 
aedeagus is moderately arcuate to strongly arcuate, the apex more or less 
produced and terminating in a hook. The two copulatory pieces, which 
are normally obscured by the spiny armature of the internal sac, are sim- 
ple, subequal, and have triangular apexes. 
