58 
Thomas C. Barr, Jr. 
Figs. 32-35. Aedeagi of Trechus species, left lateral view: 32. T. aduncus aduncus Barr, Bear- 
pen Gap, North Carolina. 33. T. aduncus toxawayi, new subspecies, Toxaway Mountain, 
North Carolina. 34. T. aduncus coweensis, new subspecies, Yellow Mountain, North Carolina. 
35. T. aduncus howellae , new subspecies, Big Butt, North Carolina. 
Nominate aduncus , which has only one elytral stria beyond the inner 
three and an aedeagus as in Figure 32, occurs along the crest of the Great 
Balsam Mountains, from Richland Balsam eastward to Mt. Pisgah, in 
Haywood, Transylvania, Buncombe, and Jackson counties, North 
Carolina. I have collected it at Mt. Pisgah, Buck Spring, Devils 
Courthouse, Bearpen Gap, Spot Knob, and Richland Balsam, at eleva- 
tions ranging between 4600 and 6000 feet (1400 and 1800 m). Its usual 
habitat is wet moss in contact with a rock surface, and it is sympatric and 
syntopic at various localities with other Trechus species: T. barberi, T. van- 
dykei pisgahensis, T. schwarzi schwarzi , and T. rosenbergi. The type (and only 
known) locality for T. satamcus lies near the middle of the range of T. a. 
aduncus , but the two species have not yet been collected at the same spot. 
Four subspecies of T. aduncus are recognized in the present paper. All 
are probably extrinsically isolated populations which have diverged re- 
cently, and they are treated as a polytypic species to emphasize their close 
relationship. Intergrades between the subspecies have not been found, 
and (except possibly for nominate aduncus and toxawayi ) are unlikely to be 
found because of the existence of low gaps between the ranges of the 
subspecies. 
