Revision of Trechus 
67 
under and among rocks in wet places near seeps and springs at altitudes 
above 5500 feet (1675 m). In such microhabitats it is often associated with 
77 valentinei, which was always more abundant, and rarely with 77 uncifer. 
The available specimens suggest a possible geographic cline in size, with 
total length increasing from Clingmans Dome along the crest to Mt. 
Kephart, then along the Boulevard across Anakeesta Ridge to Mt. 
LeConte. In the past three summers (1976, 1977, 1978) I have attempted 
to find intermediate populations (e.g., near Newfound Gap) but have 
been unable to do so. If the species is actually restricted to the very high 
elevations where it has thus far been taken, then one is faced with the 
alternative to a cline, that there are two genetically isolated populations 
less than 10 miles (16 km) apart. The only specimens known thus far from 
Mt. LeConte are those of Valentine, now in my private collection together 
with the series from Mt. Kephart and Anakeesta Ridge. In addition to 
Clingmans Dome the species has been taken on Mt. Buckley, Mt. Collins, 
and along the trail between Clingmans Dome and Andrews Bald; all 
specimens from these four localities fall into the 4.4-4. 8 mm size range. 
Trechus (Microtrechus) luculentus luculentus Barr, new status 
Figs. 13, 39 
Trechus ( Microtrechus ) luculentus Barr 1962:88. Type locality, Clingmans 
Dome, Swain County, North Carolina; type deposited in USNM. 
Trechus luculentus s. lat. is characterized by large eyes, their diameter 
equal to or greater than the length of the scape, and distinctly sinuate 
sides of the pronotum. The apex of the aedeagus is not produced; the dor- 
sal (right?) copulatory sclerite is large and scoop-shaped, and the ventral 
(left?) sclerite is a small, elongate-triangular spicule. Since collection of 
the type series in 1960, I have obtained specimens of T. luculentus from 
many other localities in the Great Smoky, Unicoi, and Nantahala moun- 
tains. Populations in the Unicois and Nantahalas differ subspecifically 
from Smoky Mountain T. luculentus. The nominate race is distinguished 
from the other subspecies by the combination of smaller hind angles of 
the pronotum, usually five longitudinal elytral striae, and the small 
aedeagus (length 0.63-0.73 mm). 
In the central Smokies, T. 1. luculentus has proven to be widely dis- 
tributed altitudinally, occurring under rocks or debris beside seeps and 
springs or near water in little ravines. Near the summit of Clingmans 
Dome it is found under rocks in little wet ravines and under broken drain 
tiles near the septic disposal field. Along Roaring Fork and in Greenbrier 
Cove it was taken from beneath leaves and sticks beside small tributary 
streams at elevations of 3000 feet (915 m) and 2900 feet (885 m), respec- 
