3i6 



NOTES ON THE SPIDERS OF NORTH YORKSHIRE. 



J. W. HESLOP HARRISON, D.Sc. 



The following notes may be regarded as a continuation of 

 those contained in my papers published in this Journal in 

 August, 1914, and January, 1915, and probably represent the 

 fruits of my last Arachnid hunts in the county, as I have now 

 left the Middlesbrough district. 



Dysdera crocata (C.L.K.). Sparingly, near Middlesbrough, and at 

 Yarm. I have very great doubts as to whether this spider has any real 

 claim to be considered a genuine native of the county. 



Agroeca brunnea (Bl.). Thinly distributed over all the Cleveland 

 Moors. 



Oxyptila praficola (Koch.). Two or three females in scattered localities 

 at the base of the Cleveland Hills, between Broughtoir and Stokesley. 



Tarentida andrenivora (Walck.). A few on Easby Moor. 



Lycosa agricola (Thor.). Common on the Yorkshire side of the Tees 

 near Middleton-in-Teesdale (vice-county 65). 



Lycosa nigriceps (Thor.). As previously, abundant everywhere in 

 Cleveland ; much scarcer on the heather not far from the locality recorded 

 for the previous species. 



Lycosa amentata (Clerck.). ) All very abundant on the Yorkshire side 



L. pullata (Clerck.). - of the Tees, near Middleton-in- 



L. higubris (Walck.). ) Teesdale. 



Theridion denticulatum (Walck.). Singly, under bark, near Middles- 

 brough. 



Ceratinella brevis (Wid.). Not uncommon near Middleton-in-Teesdale, 

 but in vice-county 65. 



Lophomma herbigraditni (Bl). With the preceding. 



Evavsia merens (Cb.). Abundant everywhere in Cleveland ; only 

 noticed here because I have recently seen it with Lasiits umbratus near 

 Great Ayton. I have now taken it with four species of ant, viz., Formica 

 fusca, Lasiiis niger, L. umbratus and Myrmeca rubra. 



Notioscopus sarcinatiis (Cb.). The SpJiagnuni having vanished in 

 the original station owing to drainage, the spider no longer exists there ; 

 nevertheless, it is as common as ever elsewhere on Eston Moor. Its other 

 habitats on the remoter moors are quite undisturbed. 



Hypselistes jacksonii (Cb.). Still common at Eston in spite of the 

 drastic drainage operations initiated there a year or two ago. It occurs 

 everywhere in the Juncus effitsus tufts which line the runner draining the 

 main central Eriophorum bog. I have also captured it whilst examining 

 Comarum pahtstre roots for Coccids. It is always to be found low down 

 in the plants. For two or three years the drainage seemed to affect it 

 considerably, but now that matters are stabilised, it has resumed and 

 maintains its usual numbers. Its congener, H. florens, has occurred 

 with it, but was originally found in boggy spots on the site of old jet 

 workings on the northern slopes of the hill at a height of over 550 feet. 



Maso sundevallii (Westr.). In a little wood near Middleton-in-Tees- 

 dale. (65), 



Hilaira uncata (Cb.). Very rare opposite Middleton, thereby con- 

 trasting greatly with its abundance throughout the Cleveland area. 



Leptyphantes lerricola (Koch.). Not really rare in the various woods 

 a few miles out from Middlesbrough, but far from being as plentiful as it 

 would be in similar spots in North Durham. 



Tetragnatha extensa (L.). In watery places, Yarm, Gunnergate, 

 Broughton. 



T. solandri (Scop.). Beaten from spruce in Marton Gill — is probably 

 not rare. 



Naturalist, 



