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near to tlie li|) of the tarsus; a hair, correspondent to this, is found on each side 

 just behind tlie bases of the claws in probably all species of Chelifer Geof. and 

 may be designated the terminal, lateral hair of the tarsus. It is in most forms 

 without much interest, but shows in "Lophochernes Sim." modifications, which are 

 valuable in the definition of many species in spite of sexual variations. This hair 

 is in Ch. Indiens n. sp. and Ch. navigator n. sp. strongly curved, almost broken, in 

 the middle with the pointed tip directed forwards in the fourth pair of legs; in 

 the first pair its curvature is less moderate ; it has a similar shape in Ch. subruber 

 Sim. and Ch. Hawaiiensis Sim., but in the latter we have the anterior hair more 

 slender and less distinctly curved than the posterior (cf. 21. pi. VII, figs. 1 d-e). 



The lateral terminal hairs of Ch. lampropsalis L. K., one of the species of 

 ''Lophochernes Sim.", in which they are most simple, show following modifications. 

 The anterior as well as the posterior hair of the fourth pair of legs are only slightly 

 curved upwards with the tip directed forwards and downwards, and are dorsally 

 near the tip provided with a tiny tooth, beyond which it is very slender and tapers 

 towards the point; the posterior (PI. Ill, fig. 5b, he) is more slender and less curved 

 than the anterior (fig. 5 b, hi). The posterior hair of the first pair of legs is in 

 both sexes fairly long and slender, and from the base moderately curved upwards, 

 but terminally beyond a small dorsal tooth distinctly curved downwards with the 

 tip directed upwards (fig. 5 a, /le); the anterior hair is in both sexes similar to the 

 hairs of the fourth pair, liut is more distinctly curved with the dorsal tooth more 

 prominent (hi). In Ch. lampropsalis sp. aff. the differentiation goes much farther, 

 for we have in this the posterior hair of the fourth pair of legs in both sexes as 

 well as that of the first pair in the female similar to the posterior hair of the 

 first pair of legs in the preceding species, being fairly long, slender and curved 

 with the terminal part curved downwards with the lip directed upwards beyond 

 the small dorsal tooth (fig. 6 e, he; 6h); the latter hair has in the male another 

 shape, being enlarged towards the end with a long median point and a small 

 dorsal and ventral tooth (fig. 6 f). The anterior hair is short, moderately curved 

 and with an almost obsolete dorsal tooth, which is completely wanting in the 

 fourth pair of legs in the male (fig. 6g; fig. 6 d, hi); the anterior hair of this pair 

 of legs is in the female very slender (fig. 6 e, hi). 



The posterior hair of the fourth pair has in the female of Ch. Mortensenii 

 n. sp. a form similar to that of the preceding species, but the portion beyond 

 the dorsal distinct tooth is almost semi-circular; this lower branch is in the 

 male more moderately curved (fig. 1 i, he) and in the first pair of legs in both 

 sexes almost straight. The anterior hair of the fourth pair of legs is slender 

 and curved moderately upwards with tip directed downwards beyond the small 

 dorsal tooth (fig. 1 i, hi), while it in the male appears almost broken; the 

 corresponding hair is in the first pair of legs shorter with more distinct tooth 

 (fig. Ih, yii). The terminal lateral hairs show in Ch. depressus CK. a similar struc- 

 ture, but the anterior hair of the fourth pair of legs is less suddenly broken, than 



