TUÄGÄRDH, ACARI. 47 



small ; behiiid the 5**» one a low, rounded tiibercle ; the sense hair on a level with 

 the S""'! teeth. The lower jaw Avith 4 teeth, the 2"'^ and 4*^» of whieli are very sniall; 

 tlie 3'''^ is stroug. situated in the niiddle and directed backwards; elose behind the 

 S^fi is the 4*'\ the f lageil um is long and provided with numeious hairs. The maxil- 

 lary palps are very long and slender; the first Joint with a low, rounded tubercle, 

 on the internal side, near the base and provided with long hairs very close together, 

 ventrally in the middle; the second Joint with one straight bristle, subventrally and 

 distally on the inner side ; the S""'' Joint with two short bristles in a transverse row 

 interiorly and distally; one (the upper one) is shorter and chisel-shaped, the other 

 widens distally to an oblipue knife-shaped edge; 5*'^ Joint provided at the top, beside 

 the iisual bündle, with a hair of remarkable length. The maxillse. (PI. 2, fig. 24.) 

 The maxillary lobes situated close together near the niiddle ; they are pei'fectly straight 

 and attached with an oblique, very broad base, as broad as or even broader than 

 their own median edge ; the lateral, thickened edge is turned sharply upward in the 

 median half, so that it appears be a separate narrow plate attached to it. The 

 maxillary plates are narrow, lanceolate and hyalin slips, with smooth median and 

 finely fringed lateral edges. 



The styli are of a peculiar shape; they are pin-shaped, straight and exactly 

 as long as the maxillary lobes. but on their dorsal side near the base they have a 

 fine hyalin, slightly S-curved appendage. Tliere are 5 pairs of hypostomatic hairs 

 instead of the usual 4 ; one is placed far backward, two in a transverse row not far 

 behind the articulation of the palps ; of these the median pair is 3 times as long as 

 the other ; one very small, hyalin hair is inserted behind the articulation of the palps, 

 externalty.i The terminal pair is long and pointed and placed on a line with the 

 middle of the base of the maxillary lobes. 



The legs. Legs I of the typical shape, tarsi II provided with 8 large stout 

 thorns at the top, tarsi III with 3—4; tarsi IV with 2 siniilar thorns; basifemur IV 

 ventrally with a short tubercle. 



Kilimandjaro : I female. 



Pachyla^laps Berl. 



Pii('lijia»lai)s (Paclij'la'laijs) castaiieus n. sp. 



(PL 2, figs. 29 * 32. PI. 3, figs. 3, 20, 26 * 27.) 



Male. Length 1,2« mm. Width l,uii mm. 



Colour deep chestnut-brown. 



Texture. Sternal and ventri-anal shields scaly. 



The dorsal side is covered by a single shield, which leaves unprotected a 

 narrow, marginal strip of soft, white skin in the posterior half. The dorsal shield; 

 the lateral edges of the anterior half and the front end strongly chitinous and curved 

 downwards so as to become visible even on ventral view. The Shoulders very broad, 

 the sides falling off abruptly towards the front end, whicli is provided with a pair 

 of short, stoiit bristles; the hairs small, scattered. 



