378 



SUBANTARCTIC ISLANDS OF NEW ZEALAND. 



[Collemhola. 



bergen, Greenland, and California among the countries which it inhabits. In the 

 British Islands it may be found both in inland localities and beneath wrack on 

 the sea-coast. 



The accompanying figures of the eyes and jDost-antennal organ (A), foot (B), 

 extremity of the spring (C), and anal spines (D) show how closely the insects from 

 Macquarie Island agree in structure with European specimens of A. viaticus. In 

 colour the Macquarie Island springtails are of a deep blue-black. The constancy in 

 structural features over a range at once so extended and so discontinuous suggests 

 high antiquity for the species. 



AcHORUTES VIATICUS, Tullberg. 



A. Right ocelli and post -antennal organ, (x 350.) 



B. Extiemity of hind foot, showing claw, em])ndial appendix, &c. ( X 220.) 

 ^ C. Dens and mncro of spring, side view. ( X 200.) 



D. Anal papillfe and spines, doreal view, (x 220.) 



Genus Triacanthella, Schaeffer. 



The genus TriacanfheUa was established by Schaeffer (1897, ji. l-t) for a single 

 species, T. michaelseni, which he described from various localities in Tierra del Fuego. 

 Quite recently Wahlgren (1906, p. 7) has described another nearly allied species 

 {T. rosea) from the same district. It is gratifying to be able to add a third very 

 distinct member of this interesting genrs from such a distant subantarctic station 

 as Campbell Island. Triacnnfhurus (Willem, 1902, p. 5), with its single Patagonian 

 species, T. daixitus, is probably not distinct genericallv from Trincanthella (Borner, 

 1906). 



Triacanthella alba, sp. nov. (Plate XVIII, figs. 1-18.) 



Length. 2 mm. Eight ocelli on each side of the head, the 2 inner hinder ones 

 very small (fig. 2). Post-antennal organ rosette-shaped, with (usually) 4 elongate 

 processes (fig. 4), sometimes with 3 (fig. 2) or 5 (fig. 3). Foot (fig. 13) without tenent 

 hairs, its claw without teeth, its empodium with a vestigial appendix (" inferior 

 claw "). Spring (figs. 1, 16, 17) with manubrium twice as long as dentes and 

 mucrones, the dens and mucro being united into a rounded finger-shaped process 

 with granulated cuticle ; in some young insects the mucro its almout distinct from 

 the dens, and has a bluntly pointed tip (fig. 18). Colour whitish. 



Lncalitj/. — Campbell Island : Venus Cove, at high-water mark. Numerous speci- 

 mens, ISTovember, 1907. (Dr. Charles Chilton.) 



