128 Thomas C. Barr, Jr. 



1.05 wide, pronotum 1.25 long X 1.39 wide, elytra 3.60 long X 2.17 

 wide, antenna 4.43 long, aedeagus 1.12 long. 



Distribution. — Described on a total of nine specimens from the type 

 locality and Bryant Edmonds Cave, 1.7 km southwest of Beckton at the 

 head of Greens Creek, Barren County, Kentucky. Although Ban and 

 Crowley (1981) demonstrated what appears to be substantial clinal vari- 

 ation in P. pubescens, this relatively uncommon southwestern geogra- 

 phic race hybridizes with nominate pubescens in Beckton Cave, 1.0 km 

 northwest of Beckton, Barren County. 



Trechus (Trechus) caliginis, new species 

 Fig. 11 



Etymology. — Latin caliginis, "of mist or fog." 



Diagnosis. — A large species of the hydropicus group in which the 

 aedeagal apex is simply attenuate, not knobbed; pronotum margins 

 broadly reflexed, hind angles blunt and obtuse; closest to T. roanicus 

 Barr but differing in pronotal characters and more strongly impressed 

 elytral striae. 



Description. — Length 3.9-4.2, mean 4.0 ± 0.1 mm (N = 5). Dark 

 castaneous to reddish castaneous; legs, mouthparts, and basal antennal 

 segments slightly paler. Eye diameter subequal to scape length. Prono- 

 tum 0.7 as long as wide, base 0.8 maximum width; reflexed margin 

 unusually wide, sides convergent without trace of sinuosity to blunt, 

 obtuse hind angles. Elytra very convex, 1.33 longer than wide, 5 striae 

 present, moderately impressed but intervals either flat or very feebly 

 convex. Aedeagus of holotype 0.52 mm long, basal bulb small and 

 deflexed at right angle to slender, very straight median lobe, which is 

 gradually attenuate and feebly reflexed at apex; left copulatory piece 

 slender, rod-like, about 0.6 as long as right piece, which is hemicylindri- 

 cal and bears small, irregular scallops on dorsal margin near bluntly 

 rounded apex; parameres slender, weakly arcuate, with 3 long apical setae. 



Type series. — Holotype male (American Museum of Natural His- 

 tory) and one male paratype, Camp Creek Bald, just below summit, 

 elevation about 1460 m, Greene Co., Tennessee/ Madison Co., North 

 Carolina (Greystone 7)4' Quadrangle), 9 August 1983, T. C. Barr, Jr., T. 

 C. Barr III; three female paratypes, same locality, 21 August 1960, T. C. 

 Barr, Jr., M. C. Bowling. Measurements of holotype (mm): total length 

 3.96, head 0.73 long X 0.70 wide, pronotum 0.70 long X 1.01 wide, 

 elytra 2.30 long X 1.71 wide, antenna 2.11 long, aedeagus 0.52 long. 



Distribution. — At present known only from the type locality in the 

 Bald Mountains between Greeneville, Tennessee, and Asheville, North 

 Carolina, this species will key out near T. roanicus in my key to Appa- 

 lachian Trechus (Barr 1979a); all other species of the hydropicus group 

 possess a more or less knobbed aedeagal apex. 



