30 ANNALS OF SCOTTISH NATURAL HISTORY 



but he shows distinctly the thickened lower segments with their 

 serrulations and the flexor surface of the second segment (Johnston's 

 first segment) continued to a sharp point (not blunted as in H. 

 longipalpis\ and this, coupled with the general description and 

 particularly that of the skin " when highly magnified minutely 

 areolar," leads me to the conclusion that the species which Dr. 

 Johnston described in 1848 as Hydrachna na'ica, is no other than 

 the Nesaa reticulata which Kramer described in 1879 Hygrobates 

 reticulatus P. Kram. of later writers. 



This being so, the law of priority as set out in Article 25 of the 

 International Rules of Nomenclature comes into operation. The 

 name of the species must in future be Hygrobates naicus (Johnston), 

 with H. reticulatus P. Kram. as synonym. 



4 MEADOWBANK TERRACE, EDINBURGH. 



THE HIGH ALPINE FLORA OF BRITAIN. 



BEING A LIST OF THE FLOWERING PLANTS AND 

 FERNS FOUND AT A THOUSAND METRES AND 

 UPWARDS ON THE MOUNTAINS OF THE BRITISH 

 ISLES, WITH AUTHENTIC REFERENCES AND CRITI- 

 CAL NOTES. 



By FREDERIC N. WILLIAMS, F.L.S. 

 (Continued from p. 251, No. 68, Oct. 1908.) 



Fam. 1 8. CRUCIFLORACE^E. 



45. Draba rupestris, Aiton. In crevices on alpine rocks, up to 

 the summit of Ben Lawers (" Fl. Perthsh." 64). " Near the top and 

 on the summit of Ben Lawers" (R. Brown, 1793, in Herb. Brit.). 

 First found by James Dickson in 1789 on Ben Lawers ("Trans. 

 Linn. Soc." ii. 288 [1790]). On rocks near the summit of Ben 

 Lawers (G. Don). Summit of Ben Lawers (Wm. Christy, 1829, in 

 Herb. Brit.), and within 10-12 feet of the top (G. C. Druce). 

 Ben Dothaidh, above 915 m. very scarce (E. S. Marshall, 1893, in 

 Herb. Brit). Rocks at the summit of Cairn Gorm (Hook. " Fl. 

 Scotica," 1821, 197 ; Hook, et Arn. "Brit. Flora," ed. 8, 1860, 31). 



46. Draba incana, L. On alpine rocks in the Breadalbane 

 district from 518-1082 m. (" Fl. Perthsh." 65). "My specimens 

 were collected from Ben Lawers," (G. Don, fasc. viii. 1806, n. 187). 

 Descends to sea-level in Londonderry. ' 



