ACARI 589 



tooth ; dorsally, at the top, and separated from the terminal 

 tooth by a narrow, deep incision, there is a thin, fishtail-shaped 

 appendage, the dorsal edge of which is perfectly straight, t'or- 

 ming an unbroken line with the dorsal edge of the chela ; 

 the ventral edge is slightly concave. 



Hypostoma (fig. 112). Supposing the shape of the hypo- 

 stoma to be essentially the same in the nympha as in the 

 adults, and the remarkable congruity in ail essential détails 

 between that of my spécimens and that delineated by Ber- 

 LESE (1) seems to justify this supposition, B's drawing contains 

 several errors. Thus, the long hairs delineated by B. at the ante- 

 rior edge of the hypostoma are decidedly not hjrpostomatic 

 hairs, but in reality the so-called styli, thus hairs or appenda- 

 ges inserted dorsally, belowthe latéral edge of the épis to ma. 

 The anterior pair of hypostomatic hairs is inserted at the very 

 top of the hypostoma, and in B.'s drawing represented by 

 a pair of very small, scarcely visible Unes. In the nympha thèse 

 hairs are short, but comparatively stout and conical. If Ber- 

 LESE has thus drawn one pair too much, he has, by way of 

 compensation, overlooked the second pair, which may, however, 

 be excused on account of their minuteness. The second pair is 

 no longer than the first, but very slender, setiform and inser- 

 ted more laterally than the latter, on a level close behind 

 the base of the maxillarylobes. Thethird pair is very large, 

 as long as the maxillarylobes; the fourth pair far back, one 

 third the size of the third. 



Maxillary lobes of very peculiar shape, inserted so far at 

 the inner side of the hypostoma, that their base is covered 

 by it and, parallel with one another. They are not, as is usually 

 the case, more or less horn-shaped, with convex, latéral, con- 

 cave médian edges, but are shghtly S-shaped, swollen in the 

 basai third, tapering towards the middle, in front of which 



(1) B. does not tell us whether it is the h y p o s t o m a of m a 1 e or f e m a 1 e, or of a ii y ni p ha 

 From the fact that he has delineated the chela of an adult, a procédure which generaly nécessi- 

 tâtes a disection, we may, however, infen that the hypostoma is that ot an adult. 



