Yorkshire Naturalists at Tanfield. 



251 



Chloroperla grammatica, Hemerohius micans, Leptocerus ater- 

 rimus and Hydropsyche augustipennis ; not one species even 

 of these was at all plentiful. 



Arachnida. — Mr. Wm. Falconer writes : — The route fol- 

 lowed by the solitary arachnologist present led along the 

 north bank of the river to Tanfield Hall, and thence along the 

 south bank through Mickley and Hackfall Woods. The 

 nature of the ground varied considerably, and many methods 

 of collecting were resorted to, but time did not permit of a 

 thorough examination being made anywhere. Especially 

 was this to be regretted in the case of Hackfall, which furnished 

 not only the greater number, but also the more uncommon 

 spiders, and the Chthonius rayi L. Koch (lO examples), met 

 with during the day. These, with a few exceptions, notably 

 Philodrbmus dispar Walck and Metopobactrtis prominulus 

 Cambr., are common and widely distributed Yorkshire species, 

 but as the district investigated had not previously been worked 

 for its arachnida, they are given in extenso below — fifty species 

 of spiders, three harvestmen, and two pseudoscorpions. 



Harpactes hombergii Scop. 

 Oonops pulcher Tempi. 

 Clubiona recltisa Camb. 

 C. lutescens Westr. 

 C. comta C. L. Koch. 

 Zora maculata Bl. 

 Amatirobius fenestralis Stroem. 

 Coelotes atropos Walck. 

 Theridion sisy phium Clerck. 

 T. denticulatmn Walck. 

 T. p aliens Bl. 

 Pholcomma gihbitm Westr. 

 Phyllonethis liHeataC\erc]>L. and var. 



redimita Koch. 

 Robeytus lividus Bl. 

 Linyphia montana Clerck. 

 L. pelt at a Wid. 

 L. hortensis Sund. 

 L. clathrata Sund. 

 Labulla thoracica Wid. 

 Leptyphantes terricola C. L. Koch. 

 L. blackwallii Kulcz. 

 L. obscurus Bl. 

 L. pallidiis Bl. 

 Bathyphantes dorsalis Wid. 

 B. nigrinus Westr. 

 Poeciloneta globosa Wid. 

 Macrargus riifus Wid. 

 Oreonetides abnormis Bl. 



Microneta viaria Bl. 

 Maso sundevallii Westr. 

 Gongylidiimi rufipes Sund. 

 CEdothorax tubevosus Bl. 

 Lophomma herbigradum Bl, 

 Dicymbiiim nigrum Bl. 

 Neriene rubella Bl. 

 Diplocephalus latifrons Camb. 

 D. picinus Bl. 

 D. cristatus Bl. 

 Entelecara erythvopus Westr. 

 Pocadicnemis pumila Bl. 

 Metopobactrus prominulus Camb. 

 Walckenaera acuminata Bl. 

 Cornicularia cuspidata Bl. 

 Ero thoracica Wid. 

 Tetragnatha solandrii Scop. 

 Aleta segmentata Clerck. 

 AI. merianae Scop. 

 Nesticus cellulanus Clerck. 

 Philodromus dispar Walck. 

 Lycosa amentata Clerck. 



Liobunum rotundum Latr. 

 Platybunus triangularis Herbst. 

 Oligolophus morio Fabr. 



Chthonius rayi L. Koch. 

 Obisium muscorum Leach. 



MoLLUSCA. — -Mr. Wm. Cash, F.G.S., writes : — The search 

 for mollusca at Tanfield and Hackfall was not very successful, 

 the height of the Ure precluded much collecting therein. The 

 one or two small ponds and the ditches also proved disappoint- 

 ing. For some reason or another, and quite contrary to one's 



1912 Aug. I. 



