60 
Thomas C. Barr, Jr. 
Measurements (in mm). — Holotype male: total length 3.84, head 0.84 
long X 0.74 wide, pronotum 0.68 long X 1.02 wide, elytra 2.17 long X 
1.55 wide, antenna 1.61 long. 
Distribution. — Known only from the type locality in the Cowee Moun- 
tains, North Carolina. 
Discussion. — The five specimens of T. a. coweensis were taken from 
beneath wet leaves alongside the road to the fire tower, just below the 
summit of Yellow Mountain at an approximate elevation of 5000 feet 
(1525 m). A single T. barben was collected at the same spot. This sub- 
species is geographically and morphologically a little closer to T. a. 
howellae, from the Nantahala Mountains farther west, than to either of the 
other two known subspecies of T. aduncus. The Cowees are separated from 
the Great Balsams by the valley of the Tuckasegee River and from the 
Nantahalas by the Little Tennessee River, thus there is every indication 
of complete extrinsic isolation of this taxon. 
Trechus ( Microtrechus) aduncus howellae , new subspecies 
Fig. 35 
Etymology . — Patronymic honoring Dr. Thelma Howell, director- 
emeritus of the Highlands Biological Station. 
Description. — Length 3. 3-3. 9, mean 3.7 mm. Elytra with at least five 
visible striae, inner three striae more deeply impressed. Aedeagus 0.87- 
0.88 mm long, very strongly and evenly arcuate in median lobe, which is 
thick, as in T. a. coweensis ; apex more evenly attenuate and terminal hook 
less reflexed than in T. a. aduncus , but not knob-like as in T. a. coweensis. 
Type series. — Holotype male (AMNH) and seven paratypes, east face of 
Big Butt, elevation 4800 feet (1460 m), Coweeta Hydrologic Laboratory, 
Macon County, North Carolina, 21 July 1970, T. C. Barr, Sr., T. C. Barr, 
Jr., and T. C. Barr, III. Two paratypes, same locality, 26 July 1969, T. C. 
Barr, Jr. 
Measurements (in mm). — Holotype male: total length 3.58, head 0.84 
long X 0.68 wide, pronotum 0.68 long X 0.96 wide, elytra 2.05 long X 
1.43 wide, antenna 1.61 long. 
Distribution. — Known only from the type locality, in a research area 
maintained by the United States Forest Service, in the Nantahala 
Mountains. 
Discussion. — The type series was collected from wet moss at the base of 
a vertical cliff face beside the Appalachian Trail on the east face of Big 
