56 
Thomas C. Barr, Jr. 
angles, and the apical groove is longer and oblique to the suture. The 
aedeagus, 0.76-0.81 mm long, is a little larger than that of 77 barben; its 
apex is slender, slightly reflexed, and finely knobbed, the copulatory 
pieces are broader, and the parameres are conspicuously thicker and 
shorter. 
Trechus ( Microtrechus) subtilis Barr 
Barr 1962:80, Fig. 15. Type locality, Mt. Sterling, Haywood County, 
North Carolina; type deposited in USNM. 
This rare species is similar to 77 barberi , with which it is sympatric and 
syntopic. Only nine specimens are known, six of them from the slopes of 
Mt. Sterling in the eastern Great Smoky Mountains, and three from 
Jones Knob (^Junaluska Balsam) in the Plott Balsam Mountains; both 
localities are in Haywood County, North Carolina. In comparison with 
T. barberi, 77 subtilis is a little larger and more robust, with propor- 
tionately smaller eyes, slightly transverse head, more arcuate pronotum 
sides which are shallowly but distinctly sinuate before the right to slightly 
obtuse hind angles, proportionately wider elytra with five distinct 
longitudinal striae, and an oblique apical groove. The aedeagus, 0.85- 
0.92 mm long, is larger, more slender, and less arcuate than that of 77 
barberi , but shows the same general pattern. 
uncifer group 
Trechus ( Microtrechus ) uncifer Barr 
Barr 1962:80, Fig. 16. Type locality, Clingmans Dome, Sevier County, 
Tennessee; type deposited in USNM. 
This species is known only from the spruce-fir forests of the central 
Great Smoky Mountains and from Water Rock Knob, in the Plott 
Balsams, between altitudes of 5500 and 6500 feet (1675 and 2000 m). 
Males are immediately distinguished by the dense spines of the internal 
sac and the long, slender, produced, hooked aedeagal apex. In the 
Smokies, the only other species of Trechus in the same size range and same 
localities (Clingmans Dome, Mt. Buckley, Collins Gap, Mt. Collins, 
Sugarland Mountain) are T. barberi and T. bowlingi. Trechus bowlingi dif- 
fers from both T. uncifer and T. barberi in slightly smaller size (2. 6-2. 9 mm, 
mean 2.7 mm), evenly convex elytra not flattened on the central part of 
the disc, and certain pronotal characters: pronotum very transverse, 
nearly a half wider than long, marginal gutter broad and extending past 
hind angles onto sides of base, hind angles very obtuse and slightly round- 
