ON NEW AND RARE BRITISH AKACHNIDA. 145 



The form of the caput and palpi will easily distinguish this 

 species from the three others of the genus as yet known to be 

 found in the British Islands. 



Two males were found on Lambay Island, Ireland, by Mr. 

 Denis E. Pack Beresford, 1906. The figure in the plate of the 

 female epigyne is from a Swiss example in my collection. The 

 species had not been before recorded as British. 



Araeoneus erratus, sp. n. PL B., Figs. 54-56. 



Araeoncus vaporariorum, Cambr.- F. O. P.-Cambr., Ann. and 

 Mag. N. H., Ser. 6, X., p. 395, 1892. Cf. O. P.-Cambridge.* 



This spider may be distinguished without difficulty from 

 Araeoncus (Erigone) vaporariorum, Cambr. (Proc. Zool. Soc., 

 Lond., 1875, p, 398, PI. 27, Fig 8), for which it was mistaken by 

 F. O. P.-Cambridge (I.e. supra), the hind-central eyes in this 

 latter being wide apart and far removed backwards from the 

 straight line of the lateral pairs, whereas in A. erratus they form 

 a nearly straight transverse line with the lateral pairs. 



An immature male found in a cellar at Cannock, Staffordshire, 

 by F. O. P.-Cambridge in June, 1891. 



Oxyptila seabrieula, Westr. PL B., Figs. 57-63. 



Thomisus scabriculus Westr. Cambr. Araneae Suecicae, p. 441. 



Adult male, length i \ lines. 



This very distinct and curious little spider, may. be easily 

 distinguished from all our, as yet known, British species by its 

 very robust form, short legs, and short strong spiny armatures, the 

 spines mostly short, strong, and clavate. 



Its general colour is a deep rich black-brown, mottled and 

 marked obscurely with reddish-brown on the cephalothorax, and 

 with a paler hue and some whitish markings on the abdomen ; 



* "List of British and Irish Spiders," p. 45, 



