338 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 117 



Distribution. — The higher mountain areas of western North 

 CaroUna and eastern Tennessee. Specimens have been examined 

 from the following localities : 



North Carolina: Haywood County: Heintooga Ridge, near Black 

 Camp Gap, 2cf , 19, June 18, 1953, T. Howell, M. J. Westfall, R. L. 

 Hoffman. Macon County: Highlands, IcT, July 13, 1949; IcT, 

 June 23, 1950, L. Hubricht; 29, June 2, 1954. 



Tennessee: Blount County: Mount Squires, on state line above 

 Cades Cove, 49, July 7, 1955, R. Highton and A. VanPelt. Sevier 

 County: Chimneys Camp Ground, Great Smoky Mountains National 

 Park, Ic^, July 29, 1949; Clingman's Dome, 4cf, 29, June 14, 1954, 

 H. E. and M. A. Evans; between Gatlinburg and Newfound Gap, 

 29, June 1960, J. G. Barker. 



These localities fall into two distinct areas: one centered in the 

 Great Smoky Mountains, the other at Highlands, N.C., about 35 

 miles to the southeast. Almost certainly B. deturkiana occurs in the 

 intervening area, but so far it has not been found despite repeated 

 collecting in the Balsam and Cowee ranges. There appears to be 

 no evident difference between specimens from the two regions. 



Gyalostethus, new genus 



Type species. — Boraria monticolens Chamberlin, 1951. 



Diagnosis. — A genus of small rhysodesmine xystodesmids char- 

 acterized by the following structural details: 



Body composed of head and 20 segments in both sexes; small, 

 robust, sexually dimorphic: W/L ratio about 22% in males, 23% in 

 females. Head proportionately large, smooth, with only clypeal 

 and labral setae; genae not impressed medially; antennae long and 

 slender, separated by a broad interantennal isthmus. 



Body segments smooth, polished, prozonites and metazonites 

 forming a perfectly flat surface dorsally, meeting at a suture line only, 

 no interzonal furrow. Paranota depressed, the posterior corners 

 produced from segment 6 to segment 19, the posterior edges deeply 

 concave; scapulorae entirely marginal; pores small, dorsolateral, in 

 elongate peritremata, the pore formula normal. 



Posterior segments of the usual form, segment 20 somewhat smaller 

 proportionately than usual for xystodesmids, hypoproct large, flat, 

 semicircular, without median apical projection. 



Legs widely separated, the anterior pair of each segment set farther 

 apart and higher up on sides than posterior pair, sternum of metazonite 



