TRÄGÄRDH, ACARI. 51 



the othcr species of tlie gemis. It is triangiilar, with sliglitly concave edges and 

 Square, truncated toi). '^^'^ edges are provided with fiue sliarp teeth, arranged in 

 groups of two and thi'ce. The top is divided into 4—5 irregulär lobes, each of which 

 is divided again into 3—4 long narrow teeth. 



The mandibles are stout (PI. 3, fig. 24). 



The chela is short and high, only a Jittle longer than it is high at the basis, 

 and with very broad condylus. The jaws are of nearly equal width. 



The Upper jaw is a little longer than the lower one, with slightly concave 

 Upper edge, curved strongly at the tip, and beside the terminal tooth provided with 

 one Sharp, backwardly directed tooth closely in front of the niiddle of the jaw; be- 

 tween the two teeth there is a low, blunt tubercle at the back of which the sense 

 hair is inserted. The lower jaw with two sharp, backwardly directed teeth opposite 

 to those of the upper jaw; the anterior edge of the posterior one is raised as to act 

 against the tubercle of the upper jaw. Calcar mandibuli very long, attaining more 

 than the double length of the chela, slightly S-curved and perpendicular. It tapers 

 toAvards the tip and seenis to be excavated on the inner side ; the groove continues 

 along the inner side of the jaw close to its dorsal margin as far as to the condylus 

 and seems here to indicate, where the calcar is fused with the jaw. The calcar is 

 supported at its basis by the ventral edge of the jaw projecting as a high ridge with 

 rounded front end. It has on the outer side, close to the margin of the ridge, a small 

 tubercle. 



The hypostoma (PL 2, fig. 31). 



Between the coxse of the maxillary palps there is a longitudinal groove. In 

 tliis we observe 7 transverse, forwardly curved rows of very minute, tooth-shaped 

 appendages. In front of the first row the inner (median) edges of the coxse are free, 

 slightly convex and with the anterior angles projecting. Of the four usual pairs of 

 hypostomatic hairs, three, which are long and pointcd, are inserted close together far 

 forward, two in a transverse row on a level with the base of the palps and one near 

 the median margin of the base of the maxillary lobes. The posterior pair is inserted 

 nearly in the centre. The maxillary lobes (PL 2, fig. 31) are of a peculiar shape 

 in so far as that they are provided with a thin appendage at the median side of the 

 basis. The lobes themselves are of the typical, well-known horn-shape and strongly 

 chitinous; they are long, narrow and curved and project beyond the first free Joint 

 of the palps with \a of their length. The appendages arrise from the basal part of 

 the median edge of the lobes and from along the ventral side of their basis, exactly 

 where the articulation is. They attain exactly the length of the lobes; the proxi- 

 mal half is of even width throughout and its median edge is thickened, curved down- 

 wards as to become nearly vertical, and set off from the rest by a small incision. 

 In front of this the appendage narrows like a neck and widens again to a thin, 

 hyalin and fin-shaped blade. This very remarkable structure resembles to a certain ex- 

 tent the structure which I have rescently described in twogeneraof myriopodophilousAn- 



