Mr. F. Walker’s Descriptions of Aphides. 269 
were now in flower at this place, but I saw nothing else of any 
interest. 
On the 28th of August I paid a visit to the north-west coast 
of Hoy, and found Drosera anglica in abundance, and Vaccinium 
uliginosum sparingly, and in the marshes above Rysay Schenus 
nigricans and Eleocharis multicaulis, both of which I also found 
in several places in the mainland. 
On the 31st Stachys ambigua was in flower at Kirkwall. Near 
Piggar, and in several other places round Swanbister, Anthemis 
nobilis occurs in plenty and apparently wild in one marshy 
field in particular, where it covers a large extent of ground, and 
is now at all events perfectly naturalized. 
At Swanbister there is a tract of low land called the “ Fidge,” 
which used to be overflowed by the sea at spring tides, but is 
now protected from this by a sea-wall built by Mr. Fortescue. 
Here there are a good many of the plants that are to be found 
in salt marshes, Salicornia herbacea, Cakile maritima, Alsine ma- 
ritima, Sagina maritima, Carex extensa, Eleocharis uniglumis, 
Ruppia rostellata, Potamogeton filiformis, Blysmus rufus, and one 
plant of Stenhammaria maritima. On the rocks called “ Bar- 
nory,” to the south of this, Ligusticum scoticum and the maritime 
form of Pyrethrum inodorum were seen ; both of these plants also 
occur in profusion in the island of Burray along with Svlene 
maritima. 
Avena fatua and strigosa are found in most of the turnip- 
fields, &e., and appear to be quite indigenous. Festuca ovina 
var. viviparais also common, and Radiola millegrana is to be seen 
in most of the moors. 
There are a few bushes of Populus tremula and Rosa villosa 
on the cliffs, on the east side of the Wauk-mill bay between Kirk- 
wall and Swanbister. 
These are all the plants which I met with that are worth 
noticing ; but on my next trip to Orkney I hope to be able to 
visit the north isles, which may perhaps add some others to the 
list, and make a trip to Orkney of sufficient interest to attract 
botanists more competent than myself to examine its flora. 
84 Great King Street, Edinburgh, Feb. 5th, 1850. 
XXVII.—Descriptions of Aphides. By Francis WALKER, F.L.S. 
[Continued from p. 28.] 
77. Aphis Mal, Fabricius. 
Aphis Mali, Faby. Ent. Syst. iv. 216; Syst. Rhyn. 298; 
Schrank, Faun. Boie. ii. 116; Gétze, Ent. Beit. 11. 317; Stew. 
