30 ARKIV FÖR ZOOLOGI. BAND 2. NIO 8. 



seen by earlier authors he considered them to be absent in 

 Schizomus and Triplomus (p. 250). In his analytical key to 

 the genera of the tribe the sole difference between Triplomus 

 and Huhhardia is that the former genus has »Cephalothorax 

 with transverse suture simple», while on Huhbardia one finds: 

 »Cephalothorax with a pair of narrowly triangulär chitinous 

 plates lying in the transverse suture»; the term »transverse 

 suture» is very ill-chosen, as it signifies the rather long trans- 

 verse membrane between the head and the thorax, and between 

 the thoracic segments. Thus the difference supposed by Cook 

 between Huhhardin and Triplomus [Trithyreus] does not exist 

 and the two genera are in reality identical. — It may be added 

 that these small plates of the first thoracic segment ha ve 

 been seen and interpreted correctly by Bernard in his paper 

 on the Solifugae^ In our paper on the Palpigradi we say on 

 the thorax in this order: »Both segments are entirely free, a 

 feature which, elsewhere, is only met with in Tartarides and 

 in Solifugce»; in Palpigradi and Solifugse the first tergite is 

 undivided. 



In Tartarides as in Oxopoei the abdomen consists of 

 twelve complete and well separated segments; the first seg- 

 ment in Tartarides was overlooked by Cambridge, Thore]! 

 and Kraepelin, while Cook (p. 250) has seen its tergite, but 

 he erroneously considers it as belonging »rather» to thorax 

 than to abdomen. We shall, for the rest, not enter into 

 further discussion of the literature dealing more or less with 

 the morphology of cephalothorax and abdomen in Uropygi, 

 as one of us (W. Sörensen) hopes soon to publish a more de- 

 tailed account of the morphology of the body in the Orders 

 of Arachnida. 



As stated above, a pseudonychium is found in all Uro- 

 pygi: in some Oxopoei it is shaped as a short, more or less 

 blunt process, in other forms as a small, curved, acute claw, 

 while in all Tartarides it is a small claw. Kraepelin says on 

 Oxopoei: »Endtarsen nur mit 2 Krallen», in contradistinction 



^ Bernard, H. M. : The comparative Morphology of the Galeodidse. 

 (Träns. Linn. Soc. London, 2 Ser., Vol. VI., Zoology, 1894—1897, p. 305 

 — 417). P. 308 he says: »Schizonotus is the only other Arachnid which, 

 like Galeodes, has retained free cephalothoracic segments, bnt it is not 

 easy to make ont the segmentation exac-tly. There are certainly two free 

 segments, and I should not be surprised if there ultimately prove, on 

 examination of favourable specimens, to be three, as in Galeodes.» 



