134 Proceedings of the Royal Physical Society. 
considerable activity, climbing away from the moisture condensed at the 
bottom of the tube, in which moisture one was nearly drowned. They made 
no attempt to feed upon the material offered to them, minute Enchytreeids 
and crushed cocoon of the Earthworm. They retired into the crevices of the 
decaying wood upon which they had been hatched. In this retirement the 
first moult took place, and the first nymph, white and slender, but larger 
than the larva, emerged in search of food. Not meeting with anything else 
to eat it attacked one of the larvae of its own species, which it reduced to 
an empty husk. It seemed to find this nourishing, as its outlines became 
more rounded, and it assumed a pinkish hue. 
| Vote.—A female Hugamasus immanis captured on 19th July 1912, oviposited 
the same day. Eggs have now been obtained, therefore, in three months, 
July, August and September | 
DIAGNOSIS OF THE SPECIES. 
Translated from A. Berlese, 1905, p. 179. 
Gamasus (Hugamasus) immanis, Berl., n. sp. (1903). 
(Spicilegia Zoolog. in “ Redia,” vol. i., n. 2, p. 262, 1903.) 
Colour, yellowish; male to some extent tinged with golden brown. Male 
with legs of the second pair slightly thickened ; femur (3) with a rather strong 
spur (which is) polliciform, incurved, acute at the apex (apical stridulatory 
radula) ; axillary process small, sharpened and subtruncate at the apex; genu (4) 
with a minute tuberculiform stridulatory process ; tibia (5) with a process similar 
and scarcely longer, very slightly produced anteriorly. Tarsus with two rather 
stout spines at the apex. Epistome broadly triangular, acute in front, with saw- 
like arrangement of small teeth at the sides. Chela with the movable digit 
scarcely hooked, with a rather large tooth in the middle of its dentarial margin, 
otherwise edentulous; with the calcar in close contact with the digit. Fixed 
digit extending beyond the movable one, not incurved at the apex, ending in 
two sharp teeth, behind the apex with saw-like undulations, but without a strong 
tooth in the middle of the dentarial margin. 
Female pyriform, stout; posterior dorsal shield almost of the form of an 
equilateral triangle, with undulate-rounded posterior margins, leaving a great 
part of the posterior dorsal surface uncovered. Epistome tapering to a subacute 
point, finely toothed at the sides and apex. Legs of the second pair with the 
extremity of the tarsi (6) armed with two spines as in the male. Epigynium 
elongate triangular, with undulate sides ; paragynia very narrow ; sternal angle 
not clearly marked ; endogynium subdiscoidal, simple; upper part of the uterine 
opening bordered with a single series of very small bristles. Chela larger than 
that of the male, with weak digits distinctly hooked ; movable digit with equal 
teeth on its inner edge; the fixed one with two teeth beneath its apex, and then 
(at the sensory bristle) almost entire, farther back armed with two rather strong 
teeth. 
A species of great size, the largest amongst its congeners. 
Male up to 2350 p in length ; 1300 » in breadth. 
Female up to 2700 » in length; 1750 » in breadth. 
Habitat,—Norway, Iceland. 
