8 ARKIV FÖR ZOOLOGI. BAND 2. NiO 8. 



AnteniiUi (Pl. 1., figs. le — Ih). — They are very similar 

 to those in Oxopoei. The first joint is much compressed. 

 considerably longer than deep, increasing somewhat in deptli 

 towards the end which is vertically cut off, but its lo^vey 

 portion is produced into a robust, conical process directed 

 downwards and somewhat forwards ; the anterior margin of this 

 process is serrate, with a large tooth at the base and the 

 terminal portion bent forwards. The second joint is articu- 

 lated at the upper angle of the end of the first joint; it is 

 claw-shaped, strong, yet rather slender, somewhat curved. 

 with a protruding angle on the lower side at some distance 

 from the acute apex; it is moved downwards to the terminal 

 margin of the first joint, reaching nearly the base of the 

 posterior margin of the above-named process. The distal portion 

 of the first joint is adorned with a number of hairs, most of 

 t hem rather long and nearly all phimose ', but some few 

 setse, inserted at the middle of the terminal margin, are 

 very remarkable (fig. Ig): their proximal half is cylindrical, 

 af ter this follows an oblong, plate-shaped expansion, while 

 the terminal portion is again setiform and besides plumose. 

 The second joint has on its inner side a most elegant equi]> 

 men t (fig. 1 h), viz., a long somewhat curved row of very 

 regularly arranged plumose hairs, and below this row a shorter 

 one of slender spines, sitting close together and forming a 

 comb. 



In Oxopoei the antennas are more robust, the first joint 

 proportionally a little shorter and of the same depth at both 

 ends; equipment with hairs on the distal portion of the first 

 joint and on the second joint is much richer than in Tarta- 

 rides. 



3Ioutli. — The maiidibles (maxillae auctorum) are of very 

 considerable size. Seen from below^ (fig. 1 c, g) each mandible 

 is directed forwards, from a narrower base widening towards 

 the anterior end; its lower surface is situated nearly in the 

 same plane as that of the sternum and the coxse of the wal- 

 king legs. The palp is inserted on its distal end, and inside 



^ The function of svich haivs, »blood-hairs», is no doubt to intercept the 

 blood of the prey when this has been cut to pieces. Hairs seiving this 

 purpose, generall}^ collected into dusters or brashes, are of frequent oecui - 

 rence in Arachnida, armed with powerful cutting or clipping antenna?, 

 suoh as Seorpiones, Pedipalpi and Kieinulei. 



