128 A. C. OUDEMANS. ACARI. 



narrow, with sharply pointed extremities, a little excavate anteriorly to receive the tritoster- 

 num, provided with two hairs. Between the tritosternum and the throat there are two small 

 rounded pièces with serrate edges, visible by the transparency of the tritosternum. I hâve 

 delineated them as if they were on the ventral side of the tritosternum, which, however, is 

 not the case. Sterno-metasterno-ventral shield long, occupying the whole space between the 

 legs II, III and IV and a considérable part of the belly, narrowest between legs IV, grad- 

 ually becoming wider backward, posteriorly truncate, with scarcely rounded angles. The latéral 

 edges of the ventral part when lengthened backward do not unité with the latéral edges of 

 the large anal shield, for this shield is comparatively much wider in the présent species 

 than in the foregoing one. The sternal portion evidently is only the part before the génital 

 aperture, it bears the usual three pairs of sternal hairs. The metasternal portions evidently 

 are small, triangular, behind the génital aperture and between this aperture and the foveolae 

 pédales II; each bears its single hair. The remaining of the shield must be considered as the 

 ventral shield, which is enormously developed because of the génital shield having moved so far 

 forward. It shows an interior marking behind the génital aperture much more distinct than 

 in the foregoing species, consisting in two granulate or porate lozenge-shaped pièces, followed 

 by a smooth triangular part. It is provided with about 9 pairs of marginal hairs and a 

 single submedian pair in the posterior margin. Génital shield wholly protecting the génital 

 aperture, almost round-rhomboidal, wider than long, single, not double ; it shows, however, 

 two interior chitinous wavy lines, which simulate an opening or split between two valves ; 

 it is provided with two pairs of minute bristles. Anal shield more or less trapézoïdal, wider 

 than long, anteriorly straight, scarcely concave, sides convex, posteriorly very convex; ail 

 the angles rounded (ratio length to width = 100 : 154); provided with 6 pairs of hairs as 

 follows : one a little behind the anterior angles, one in the posterior angles, two flanking the 

 anus, and two in the posterior margin, of which the outer are much longer than the other 

 ones. Anus small, oval, shut by two valves, before the centre of the shield. The pedal shields 

 {circular chitinous rings around the foveolae pédales), the peritrematic shields and the enorm- 

 ously developed metapodial shields fused. The peritrematic shields narrow, only discernible 

 internally of the peritremata; behind the stigmata the démarcation of thèse shields and the 

 metapodial ones is discernible. The metapodial shields enormously developed, extending 

 backward till the level of the anus, extending forward, externally of the peritremata till the 

 level of the centre of foveolae pédales I; their internai edge concave, not parallel to the 

 external edges of the ventral and anal shields ; their external edges forming the edges of the 

 body; provided with a row of 8 marginal hairs, about 7 hairs between peritrema and latéral 

 edge, and about 10 metapodial hairs. Stigma rather large, on the usual place. Peritrema 

 long, extending forward beyond the camerostome, not becoming dorsal, rather wide, dark 

 brown coloured. 



Epistoma (Fig. 40) distinctly demarcate from the bases of the palps, smooth, without 

 any markings, anteriorly triangular with smooth scarcely convex edges, ending in a strong 

 chitinous mucro ; the free anterior part is interiorly provided with a crest. No styli! 



Mandibles short, when retracted not extending backward beyond the anterior edge of 

 the sternal shield. When we consider the sheath as a coxotrochanter, the fémur is short 

 and distinctly articulate with the so called chelae (see fig. 44); thèse chelae must represent 



