Bd. V: II) THE ACARI. 19 



The projection of T. villosns Trt. is developed into a large plate and covers 

 nearly the proximal half of the mandibles. 



Allthough both species bear a great resemblance in these respects }-et they 

 cannot be refered to the same genus on account of the entirely different shape 

 of the epirostral plate and structure of the cuticle and the céphalothorax being 

 distinctly separated from the abdomen in T. villosns. 



The genus Tectopenthalodes is most closely related to Stereotydeus Berl. & 

 Leon. [15, p. 14 — 15] described from South America, which has ho\\ever 5-jointed 

 palpi. 



8. Tectopenthalodes villosus Trt. 



1903. Penthaleus villosns Trouessart [ii, p. 6]. 

 (PI. I. figs. 9 & lo, PI. II, figs. 3, 4 & 7. text-fig. 31.) 



My specimens agree wholly with T.'s type specimens, which I have been able 

 to examine. 



The following additions and corrections are to be made in T.'s description. 



Texture. If the mite is macerated in caustic potash we notice that the exceed- 

 ingly minute velvet hairs are arranged in polygonal areas, divided by low, bare 

 ridges (PI. I, fig. 10). 



The epirostral plate which covers the base of the rostrum is three-lobated, 

 not bi-lobated as stated by Trouessart (PI. II, fig. 4); the plate is sculptured 

 by small, semi-spherical projections; the lateral lobes are subquadrangular with 

 fine hairy, slightly undulating edges; the median lobe is rounded and smooth, 

 only clothed with velvet hairs. At the base of the median lobe is a small trans- 

 verse oval area, where the cuticle is smooth; on this area a pair of small hairs is 

 situated. 



The maxillary palps (PI. II, fig. 7); the second joint is broader with more 

 convex dorsal edge than is shown in T.'s figure; the last joint is obliquely truncated 

 at the end; the posterior dorsal hair is, even in T.'s specimens, situated further 

 forward, at the middle of the joint, and the anterior dorsal hair of the 3rd joint is 

 situated close to the front edge of the joint. 



The mandibles (PI. II, fig. 3) bear a great resemblance to those of Halotydens 

 hydrodroimis Berl. & Trt [i. Fasc. LX. No 10. Tab. 32. fig. 3]; the lower jaw 

 of the chela with broad proximal half and narrow, curved and pointed end, the 

 dorsal edge without teeth. The upper jaw is flattened or even slightly concave 

 at the outer side, lanceolate; the ventral edge is convex and smooth; the dorsal 

 one with one tooth near the end; one curved hair, behind the chela, on the dorsal 

 side. 



