62 
Thomas C. Barr, Jr. 
Trechus ( Microtrechus) balsamensis Barr 
Barr 1962:87, Fig. 24. Type locality, Water Rock Knob, Haywood- 
Jackson counties, North Carolina; type deposited in USNM. 
This species is known only from the type locality, at an elevation of 
6200 feet (1900 m) in the Plott Balsam Mountains. It occurs beneath 
moss carpets and in spruce-fir needle duff at the base of low cliffs on the 
north face of Water Rock Knob, in spruce-fir forest. It is syntopic with 77 
rosenbergi and 77 barben at the type locality. Both 77 uncifer and 77 subtilis 
have been taken in the Plott Balsams, but not at the Water Rock Knob 
locality. 
Trechus balsamensis resembles T. nebulosus in habitus and habitat select- 
ed. It is characterized by large eyes, pronotum sides feebly sinuate only in 
basal 0.05, hind angles small and approximately right, very feebly im- 
pressed elytral striae, only the inner two or three of which are present; 
aedeagus 0.93-1.05 mm long, of the same size and shape as that of T. 
nebulosus , but apex much broader in dorsal view, the right piece scoop- 
shaped, much larger than the left and without an apical twist. 
Trechus ( Microtrechus ) valentinei, new species 
Figs. 11, 36 
Trechus ( Microtrechus ) verus: Barr 1962 (in part). 
Etymology . — Patronymic honoring Dr. J. Manson Valentine for his 
early studies of North American trechines. 
Diagnosis . — Distinguished from other species of the nebulosus group by 
small eyes, broad pronotum base with acute hind angles, pale coloration; 
aedeagal apex attenuate and produced, finely knobbed, twisted to left; 
parameres broad and non-styliform. 
Description. — Length 3. 6-3. 9, mean 3.7 mm. Piceous, more or less pale, 
shining, form moderately robust and subconvex. Head slightly longer 
than wide; labrum shallowly emarginate; eyes small, their diameter 0.7 
scape length; antenna about 0.45 body length. Pronotum three-fourths as 
long as wide, conspicuously transverse; apex 0.9 times as wide as base 
and only 0.7 maximum width, which occurs in apical third; margins con- 
vergent behind, not sinuous; hind angles small, sharp, acute, laterally 
produced, base slightly lobed; basal foveae large and deep. Elytra 0.4 
longer than wide, disc subconvex, usually with five longitudinal striae, 
4th and 5th more shallowly impressed; apical groove short, joining 5th 
stria a short distance anterior to anterior apical puncture; scutellar stria 
very short, obsolescent; anterior discal at level of fourth umbilicate. 
