16 Proceedings of the Royal Irish Academy. 



black. Prince Charles Foreland (near Point Carmichael, Presh'n-ater Bay, 

 a dark green specimen amoug moss on the shingle of raised beach, at 40 feet 

 elevation, 4th July, 1921 ; a dark violet specimen at same locality on sand ; 

 two violet specimens at 1,300 feet level on Lordstair's Heights, 4th July, 

 1921 ; two violet specimens among Bryas octopekda and iinder stones on top 

 of low hill near coast, 10th July, 1921). Cape Boheman (a violet specimen 

 on plants among rocks on dry tundra, 12th Jiily, 1921). Gips Valley (a 

 violet specimen among stones and moss on a warm slope, near coast, 26th 

 June, 1921). Klaas Billen Bay (four dark green specimens among plants 

 and under shingle of raised beach near Bruce City, 11th August, 1921). 

 Bear Island (five dark olive green specimens at "Walrus Bay, loth June, 1921, 

 four dark violet under shaly stones on hill slope, and two green among moss 

 in dry gully at "Walrus Bay, 22nd June, 1921 ; fom- dark violet specimens 

 under stones by stream in gully in dolomite, "Walrus Bay, 22nd June, 1921 ; 

 two of same form on rocks by stream in Tetradium limestone, south centre 

 of island, 11th August, 1921 ; two blue-black specimens under stones near 

 Elassia Lake, south-west of island, 17th June, 1921. Skorikow (1900, p. 204) 

 records /. xiridis from Horn Sound towards the northern extremity of the 

 West Island. 



This spriugtail, one of the commonest members of the British and Irish 

 fauna, has a very wide range in the Arctic regions, Europe, and Xorth 

 America. 



Isotoma multisetis sp. nov. (figs. 1-5). 



Length, 2-5 mm. Feelers half as long again as head ; their segments as 

 7 : 12 : 13 : 14. Eight ocelli on each side : post-antennal organ elongate- 

 oval ; longer than diameter of front ocellus (fig. 2). Foot-claw and empodial 

 appendage (fig. 3) untoothed or with only a trace of teeth, ilucro of spring 

 (fig. 4) with three teeth (a terminal and two dorsal). All abdominal 

 segments (in some specimens the thoracic segments also) with long feathered 

 bristles (fig. 5) . 



Colour, yellowish, verging towards orange or olive-green, with dark 

 segmental margins. 



Locality, Bear Island. Types in Hope Museum, Oxford. 



This species, nearly allied to /. viridis Bourlet, may be distinguished by 

 the greater number of feathered bristles (which extend to the anterior 

 segments), the more elongate and relatively narrower post-antennal organ, 

 the absence of teeth on the foot-claws, the smaller size, and the apparently 

 constant coloration. The dark segmental margins and abundant bristly 

 covering enable the observer easUy to recognize insects of this species among 

 a nimiber of /. viridis. 



