1891.] ASSOCIATION OF GAMASIDS WITH 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 diffi- 

 cult 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 merel)'^ 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 conse- 

 quently the mandibles cannot be retracted within the bodj'^, as those 

 of the Gamasidee usually can. The whole dorsal surface is set, at 

 nearly regular intervals, about 30 to the millimetre, with spiue- 

 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 Siilockirus 

 rovennensis of Canestrini. 



L^LAPS VACUA, n. sp. (Plate L. figs. 7-7 b.) 



2 d 



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 con- 

 siderably arched. 



Mandibles short, those of male (fig. 7 a) have the fixed arm of 

 the chela nearly straight for three quarters of its length, then sud- 

 denly bent downward so as to form a very large, straight, terminal 



