290 Yorkshire Naturalists at Hebaen Bridge. 
coxenus nitidulus, which associates with this ant, and which 
was found some years ago by the Rev. F. D. Morice in an 
adjoining valley. Apparently the woods and heaths of Hard- 
castle Crag and Crimsworth Dene are the only remaining 
localities for Formica rufa in the hilly portion of West York- 
shire. There is no doubt that it has disappeared from other 
localities within recent years, and in others again there is 
nothing but place names to indicate its former occurrence, 1.e., 
Pismire Clough. Other species of ants noted, chiefly under 
stones, were Myrmica rubra and Lasius niger. 
The following social bees were found frequenting heads of 
marsh thistle and the flowers of meadow sweet :—bombus 
agrorum, B. pratorum (very common), B. latreillellus (queen 
only), B. terrestris (common), B. terrestris var. virginalis, B. 
lapiaarius, B. lapponicus (worker only), Psithyrus vestalis. 
The social wasps seen were :— Vespa vulgaris, V. rufa, 
V. norvegica, V. sylvesins. 
Of the solitary bees the common species Halicius rubicundus 
and Andrena albicans only were captured. 
DipTERA.—Mr. Butterfield writes:—Among the larger 
Diptera, the undermentioned were determined :—Syrphus 
rvibesit, S. grossularia, Volucella pellucida, Sericomyia borealis, 
Enstalis pertinax. 
Mr. W. H. Burrell reports that a large proportion of the 
Birch seed that was seen was infested with the grub of Oligo- 
trophus betula. He is indebted for the identification of this 
species to Mr. G. H. Taylor of Leeds University. 
ARACHNIDA.—Mr. Falconer writes :—The following arach- 
nida were obtained as the result of three day visits paid at 
different times to the Hardcastle Crags valley, and one with 
Mr. Winter as my fellow worker to Crimsworth Dene, July 31st. 
The entries include 88 species of spiders, 7 harvestmen, one 
false scorpion and 10 mites. The rarer British species on the 
list are Hahnia pusilla C. L. Koch (Delamere Forest and Ripon), 
Onesinda minutissima Camb., Centromerus arcanus Camb., 
Macrargus firmus Camb., Sintula cornigera Bl., and Maro 
sp.ined. (the last also at Slaithwaite, but male not yet to hand). 
Of a few others the distributional range in the county still 
needs elucidating, Leptyphantes mengii Kulcz., Porrhomma 
montanum and P. pallidum Jacks, P. thorellit Herm., Enmidia 
bituberculata Wid. (records for W. Riding unaccountably few), 
Wideria cucullata C. L. Koch, etc. The Hahnia, Sintula, and 
W. cucullata were taken in Shackleton Wood, Centromerus 
arcanus, C. prudens, Macrargus firmus, Maro, at Hardcastle 
Crags, and Onesinda shaken from heather roots overhanging 
a wall at the Fishpond, Crimsworth Dene. 
In the list the species which occurred in both valleys are 
unmarked ; those only in the Hardcastle Crags Valley are 
Naturalist, 
