Revision of Appalachian Trechus 
(Coleoptera: Carabidae) 
Thomas C. Barr, Jr. 
School of Biological Sciences, 
University of Kentucky, Lexington, Kentucky 40506 
ABSTRACT . — Appalachian Trechus are arranged in 2 subgenera, 4 
species groups, and 28 species of which 6 species are polytypic. A new 
key to species and subspecies includes all 40 taxa in the genus known 
from Georgia, Kentucky, Maryland, North Carolina, South Carolina, 
Tennessee, Virginia, and West Virginia. Thirteen new taxa are 
described and illustrated: T. schwarzi scopulosus , new subspecies, North 
Carolina; T. schwarzi saludae, new subspecies, North Carolina; T. can- 
dy kei pisgahensis, new subspecies, North Carolina; T. haoe, new species, 
North Carolina and Tennessee; T. tusquitee, new species, North 
Carolina; T. valentinei, new species, North Carolina and Tennessee; T. 
stupkai , new species, Tennessee; T. luculentus umcoi , new subspecies, 
North Carolina and Tennessee; T. luculentus wayahensis , new subspecies, 
North Carolina; T. nantahalae , new species, North Carolina; T. aduncus 
toxawayi, new subspecies, North Carolina; T. aduncus coweensis, new sub- 
species, North Carolina, and T. aduncus howellae, new subspecies, North 
Carolina. New locality records are reported for 8 taxa. Trechus hydropicus 
is polytypic, with subspecies T. h. hydropicus (Horn), T. h. beutenmuellen 
Jeannel, T. h. avus Barr, and T. h. cams Barr. 
INTRODUCTION 
Species of Trechus are numerous and locally abundant in the southern 
Appalachian mountains (Unaka and Blue Ridge provinces) of western 
North Carolina, eastern Tennessee, and adjacent portions of Virginia, 
Georgia, and South Carolina. One species, T. cumberlandus Barr, occurs in 
the Cumberland plateau of Kentucky and Tennessee; T. tennesseensis Barr 
exists in caves in the Appalachian valley of east Tennessee, and T. 
hydropicus (Horn) ranges northward into easternmost Kentucky, western 
Virginia and Maryland, and eastern West Virginia. Five Appalachian 
species were recognized by Jeannel (1931) in his revision of North 
American Trechini, and previously I described an additional 18 species 
from the area (Barr 1962). 
Since 1962 many fresh collections have been made. Study of this 
material and comparison with my 1960 collections led to the present 
paper. Thirteen new taxa are described, bringing the total for the region 
to 40 taxa, which include 28 species, of which 6 are interpreted as 
polytypic. In contrast, there are only 12 known native species of Trechus in 
Brimleyana No. 2: 29-75. November 1979 
29 
