274 Scientific Proceedings, Royal Dublin Society. 
Famity.—EKNTOMOBRYIDAE. 
Isotoma fimetaria (Linn.). 
A few examples of this delicate species occurred at Cape Flora 
(19th August, 1896, and 14th July, 1897) and Cape Gertrude 
(27th June, 1897). It is doubtless a widely distributed form, as 
it occurs in Greenland, Siberia (7), Finland (5), Sweden (7), 
Scotland (1), northern Germany (4a), and Bohemia (5). 
Isotoma bidenticulata, Tullb. 
Judging by the present collection, this seems by far the 
commonest and most dominant springtail of Franz-Josef Land. 
It occurred at Cape Flora (21st May, 30th June, 11th and 14th 
July, 1897), in Windy Gully, Miers Channel (25th August, 1896), 
and on pools by Carpenter’s Rock (16th August, 1896). At the 
last-named locality, as also at Cape Flora (in June), an enormous 
number of specimens were collected. The species is already 
known from Greenland (7), Spitzbergen (4c), Novaya Zemlya (7), 
northern Siberia (Cape Chelyuskin), and the mountains of 
Scandinavia (5). 
Isotoma brevicauda, sp. NOV. 
Length 1:7mm. Antenne as long as head, the fourth seg- 
ment twice as long as the third, and half as long again as the 
second (figs. 12, 13), post-antennal organ shortly ovate (fig. 13), 
fore-feet with two (fig. 14), middle and hind-feet with three 
(fig. 15) tenent hairs; both large and small claws toothed on 
inner margin; tip of abdomen with slender feathered bristles 
(fig. 16); spring short, manubrium not projecting beyond last 
abdominal segment ; dens, one and a-quarter times length of third 
abdominal segment (fig. 12); mucro with four teeth (figs. 17, 
18); colour, deep blue-violet, except legs, distal part of dens, and 
third and fourth antennal segments, which are pale yellow. 
Six specimens of this springtail occurred at Cape Gertrude, 
27th June, 1897. 
