CarPENTER—Collembola from Franz-Josef Land. 273 
and on rocks between Capes Gertrude and Barentz (21st March, 
1897). The species is recorded from Novaya Zemlya and 
northern Siberia (5, 7); specimens which Dr. C. Schaffer, of 
Hamburg, has most kindly sent me for comparison are from 
Spitzbergen. 
The examples of this species from Franz-Josef Land are 
characterised by a somewhat larger size (1:5 mm.) than that of the 
typical form, and by the whole body, except the legs and spring, 
being of a uniformly blue-black colour. I therefore propose to 
distinguish them as var. concolor. In typical A. dubius the 
pigment is in scattered patches. 
It seems advisable to give structural figures of this interesting 
and little-known form. The post-antennal organ (figs. 3, 4) is of 
an almost regular rosette-shape, consisting of five prominences 
surrounding a central circular one. The fore-foot (fig. 5) has two 
tenent hairs, the middle and hind-feet (fig. 6) three; the lamella 
of the small claw of the fore-foot is narrow. The mucro, seen 
from the side (fig. 9), has a narrow but distinct lamella, hardly 
noticeable in immature specimens (fig. 11). The hairs are of the 
type of A. purpurascens, Lubbock, a few long, curved bristles being 
mixed with the short ones (fig. 7); only on the last abdominal 
segment are the bristles straight. In the present variety (concolor) 
the curved bristles are less long and less numerous than in typical 
A. dubwus. 
This variety is, in some respects, intermediate between the 
typical form of A. dubius, Tullb., and A. Theelii, Tullb. (7). It 
agrees closely with the latter species in size and colour, but that 
insect has the anal papillee separated, and the spines straight. In 
the Franz-Josef Land form, as in typical A. dubiws, the papille 
arise close together (fig. 8), and the spines are curved (fig. 7). 
Achorutes longispinus, Tullb. 
This is evidently a common and widespread species; it 
occurred in numbers at Cape Flora (19th August, 1896, Ist July, 
1897) and on Bruce Island (23rd. May, 1897). First described 
from Novaya Zemlya (7), it has since been recorded from Spitz- 
bergen (4c), Scotland (1), and Buenos Aires (40). 
X 2 
