Revision of Trechus 
61 
Butt, a prominent peak in the Nantahala Mountains. The only other 
Trechus species associated with T. a. howellae was T. barben , a pair of which 
was also taken at the Big Butt site. 
Trechus ( Microtrechus) talequah Barr 
Barr 1962: 82, Fig.^20. Type locality, Haw Knob, Monroe County, Ten- 
nessee; type deposited in USNM. 
Trechus talequah is a Unicoi Mountains vicar species to T. aduncus. 
Morphologically and geographically it is much farther removed from the 
subspecies of T . aduncus than they are from each other. It is smaller and 
flatter than T. aduncus , has deeply impressed elytral striae and a shorter 
apical groove. The aedeagus is shorter and straighter, but its form 
nevertheless suggests a close affinity with T. aduncus. The species coexists 
at Haw Knob (type locality) with T. luculentus unicoi and on Haoe Lead, 
Graham County, North Carolina, with T. haoe. Females and undissected 
males are easily separated from T. haoe by the depressed form and deep 
elytral striae. 
nebulosus group 
Trechus ( Microtrechus ) nebulosus Barr 
Barr 1962: 86, Fig. 21. Type locality, Mt. Kephart, Sevier County, Ten- 
nessee, and Swain County, North Carolina; type deposited in USNM. 
Trechus nebulosus is a species of medium size (3. 3-4.0 mm) with large 
eyes, the sides of the pronotum not sinuate, and the hind angles obtuse 
and slightly reflexed. It is abundant beneath wet, fluffy moss which car- 
pets north-facing cliffs along the crest of the Great Smoky Mountains 
from Clingmans Dome to Mt. Guyot, including the Mt. LeConte spur. In 
this region it coexists with three smaller species of Trechus (T. barben, T. 
bowlingi, T. uncifer) and with four other species of the nebulosus group ( T . 1. 
luculentus, T. valentinei, T. novaculosus , and T. verus). The only one of these 
species in the same size range and also having large eyes is T. luculentus , 
but in that species the sides of the pronotum are distinctly sinuate before 
the hind angles. Males of T. nebulosus are always easily determined if the 
aedeagus protrudes or is removed, because the tip of the right copulatory 
piece is large and twisted into the shape of a bird’s head. 
The lowest elevation at which I have collected T. nebulosus is about 4600 
feet (1400 m) from mossy boulders along Ramsay Prong, above the 
Cascades, in Sevier County, Tennessee, on the north side of the Smokies. 
At higher elevations it is the most common of the larger species in the 
moss carpet assemblage. 
