ACARI 527 



tubercle in front of it, is missing in the var. cavernicola, and the 

 bristles at the top of the tarsus are very small and incon- 

 spicuous, much smaller, as a matter of fact, than in the female. 

 On the other hand, the distal third of the tarsus is demarca- 

 ted from the rest by a ring of weak cuticle, and is capable of 

 being telescoped into it ventrally as shown in figure 8, where 

 the top is bent downwards. 



Ambulacres (fig. 11). At the base of the peduncle, dorsally, 

 there is a pair of slender, tactile hairs, about half as long as 

 the peduncle. One pair of lanceolate, pointed, subunguinal 

 slips and a well developed subunguinal membrane, longer than 

 the claws. 



Female 



Epis t orna (fig. 12) difïering from that of the maie, the 

 cusps, especially the latéral ones, being narrower at the base 

 and more pointed at the top ; they are also longer than in 

 the maie, especially the latéral cusps, so that the médian mucro 

 is not twice as long as the latéral ones as in the maie. It agrées 

 more with var. monticola Berlese than with the main form 

 (compare Berlese 1906, pi. 14, fig. 11). 



Mandibles (fig. 13) slightly broader than in the main form, 

 and, although the number of teeth of the jaws is the same, the 

 configuration of the dental edge is différent. Lower jaw more 

 sharply curved near the top, its ventral edge almost straight 

 for the greater part of its length, while in the main form it 

 curves upwards in a long, even curve from a little beyond the 

 middle of the jaw ; top of upper jaw blunter and shorter. In 

 the main form the hindmost of the lower teeth is placed in 

 front of the middle of the free edge, in the var. cavernicola 

 exactly in the middle. Subterminal tooth of upper jaw very 

 small ; between the second and third tooth the edge rises to a 

 thin, semicircular blade, on a level with which pilusdentarius 

 is inserted ; between the fourth and fifth the edge is also raised, 

 and behind the fifth there is anarrow, anteriorlyrounded blade. 



