igir. Jackson. — A Spider new to Science. 31 



blunt, the exact arrangement seeming to vary in different 

 specimens. All bear hairs. The femur in the specimen 

 measured was .67 mm. long. 



The denticles on the femora of the first pair of legs are 

 not unlike those seen in E. Welchii, but those on the second 

 pair are almost or quite as large as those seen on the first, 

 instead of being very much smaller, as in the species now 

 described. The tibiae and their apophyses are very different 

 indeed from those of E. Welchii, as Mr. Cambridge's recent 

 figure shows, ^ and the palpal organs are quite dissimilar in 

 the two species, spinosa lacking the enormous dens medius, 

 and having the whole group of organs small and incon- 

 spicuous. The vulva of the female spinosa differs markedly 

 from those of all its congeners, and could not possibly be 

 mistaken for that of E. Welchii. 



Mr. R. Welch of Belfast obtained three males and two 

 females of this species near Bunbeg in County Donegal, 

 in September, 1908, These were probably obtained on the 

 Carrickfin peninsula, and not very far from the sea. I have 

 great pleasure in connecting Mr. Welch's name with this 

 fine and distinct species, especially as he has already added 

 E. capra Sim. to the fauna of the British Islands.^ 



I must thank Mr. Pack-Beresford for sending me the 

 specimens, and Mr. Cambridge and Professor Kulczynski 

 for having so kindly examined them. M, Simon also has 

 been good enough to send me French examples of E. spinosa 

 Camb., and Mr. Falconer has contributed some notes on the 

 English examples of that species, of which I only possess 

 the aforesaid continental specimens. 



Description of Plate i. 



Erigoiie ]Velihii (sp. nov.) 



1. Tarsus and palpal organs of right side from below. 



2. Right palpal tibia from above. 



3. Right patellar apophysis from the front — tibia amputated. 



4. Left palpus from outer side. 



5. Falx, and proximal joints of palpus and first two legs. Right side 



from outer aspect. 



6. Vulva from below. 



7. Vulva from below and in front. 



dm. = dens medius. dp. = dens posticus. 



1 Proc. Dorset Nat. Hist, and Aiitiq. Field Club, vol. xxx., 1909. 



2 Irish Naturalist, vol. xix., 1910, pp. 141-I45. 



