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Show 1891.] ASSOCIATION O F G A M A S I D S W I T H ANTS. 651 Colour light yellow-brown or bay. Texture fully chitinized, except as mentioned below; smooth but not polished; the whole of the dorsal plate is covered with very fine irregular reticulations, which are slightly longer in a direction across the body than in that from rostrum to posterior end; in the former direction they average about 35 to the millimetre. They are difficult to see. No other markings. Shape almost elliptical, rather more pointed posteriorly than anteriorly. The chitinized dorsal plate does not cover the whole of the body, but allows a considerable space of white flexible cuticle to be seen at the hinder end; this cuticle, if seen by a sufficient amplification, is found to be finely striated in a transverse direction. The mandibles of the male (figs. 6 a, b, c) are the remarkable feature of the species; the fixed arm of the chela is merely a very minute straight spike; the movable arm is a long, slender, round horn, not toothed, but doubly undulated, curving downward and across the body; thus the two movable arms cross, and consequently the mandibles cannot be retracted within the body, as those of the Gamasidae usually can. The whole dorsal surface is set, at nearly regular intervals, about 30 to the millimetre, with spine-like hairs, which gradually increase in length from the anterior to the posterior end of the body; those at the rear are more than twice as long as the anterior ones. Ventral surface of female as in L. cuneifer. Legs without apophyses, all terminated by claws and caruncles. Hab. Found in the nests of Camponotus herculeanus (probably race ligniperdus), near Innsbruck, Tyrol, but rare. The nearest ally of this species would seem to be the Stilochirus rovennensis of Canestrini. LCELAPS VACUA, n. sp. (Plate L. figs. 7-7 b.) 2 3 millim. millim. Length, about '53 '49 Greatest breadth, about *31 #29 Length of legs, 1st pair, about.. '44 '41 „ 2nd „ „ .. -32 -34 „ 3rd „ „ .. -29 -30 „ 4th „ „ .. -44 -41 Colour light yellow-brown or bay. Texture fully chitinized, smooth but not polished, divided into small, mostly almost hexagonal reticulations; no other markings. Shape rather shield-shape, sharply cut in front of shoulder, which is the broadest place; the width of the body diminishing towards the posterior end, particularly in the male. Dorsal surface considerably arched. Mandibles short, those of male (fig. 7 a) have tbe fixed arm of the chela nearly straight for three quarters of its length, then suddenly bent downward so as to form a very large, straight, terminal |