HYDRACHNIDS FROM THE ISLAND OF TIREE 163 



several species under the generic name Tiphys, neither 

 characterising the genus nor specifying a type. 1 In 1837 

 he substituted Acercus for Tiphys, which he thought pre- 

 occupied, but in this he was in error, as has since been shown ; 

 here he designated no type, but used T. sagulatus, a species 

 not since recognised, to illustrate the genus." 



At present I cannot say anything in support of either 

 of these opinions, as I have not yet been able to see the 

 descriptions and plates published by Koch from 1835 to 

 1841. However, the name Tiphys is used here, as I find 

 it convenient to follow the nomenclature of " Das Tierreich," 

 Lief. 13, 1901. 



Hydryphantes ruber, De Geer. This species along with 

 varietal forms has already been recorded for Scotland. I 

 found several specimens of it near Scarnish. Like Thyas, 

 Hydryphantes possesses a median eye accompanied by a 

 characteristic chitinous plate, but it differs from Thyas in 

 the absence of the dorsal chitinous plates with which the 

 latter is more or less equipped. 



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. 



THE present List is intended to be a basis for an account 

 of the High Alpine Flora of the British Isles. The 

 altitudinal range of British plants has not, in its varying 

 aspects, been studied with the fulness and scientific 

 method which have been brought to bear on the mountain- 

 plants of Central Europe. This is due to several causes. 

 The Flora of the Alps has always excited the interest of 



1 The italics are mine. 



