;J2 ARKIV FÖR ZOOLOGI. BAND 2. N:0 S. 



legs is still more elongate than in Uropygi and has yet the 

 patella developed as well as the following pairs. 3) Jn all 

 Uropygi one long tactile hair is inserted at the end of tibia 

 of the three posterior pairs of legs; at the end of that joint 

 of the first pair of walking legs interpreted by us as tibia 

 two similar tactile hairs are found. 4) The occurrence of the 

 lyriform organs on the first pair of legs as compared with 

 their occurrence on the three other pairs agrees with our 

 interpretation of the joints in the first pair. 



Our interpretation of the patellar and tibial parts of 

 the mandibular palps in Tartarides agrees with the descrip- 

 tions of Thorell, Kraepelin and Cook. The interpretations of 

 these parts and of the joints, beyond the femur, in the first 

 pair of walking legs in all Uropygi produced by Börner 

 (Sitzungs-Berichte d. Gesellsch. naturforsch. Freunde Berlin 

 1903, p. 308 — 309) are wrong and are mentioned here only 

 for the sake of completeness. 



In Oxopoei Thorell applies other merely descriptive de- 

 nominations - as humerus, brachium etc. — to the joints of 

 the palps; but these names, know^n from descriptions of Scor- 

 piones, can not be recommended; it must, however, be added 

 that Thorell in footnote 2 on p. 535 in the paper containing 

 his Tartarides discusses the equivalence of the joints of 

 the palps in Scorpiones, Chelonethi, Amblypygi and Oxopoei. 

 Kraepelin speaks of »Femur, Tibia und Hand» in the palps 

 of Oxopoei, being of the opinion that the patellar part is 

 wanting, but the articulation between the two joints named 

 by him »Tibia» and »Hand» shows that they ought to be 

 named pars patellaris and pars tibialis; the tarsus itself is 

 claw-shaped in this tribe. The difference as to the joints 

 between the palps in Oxopoei and Tartarides is confined to 

 the most distal portion of the appendage, being evidently 

 connected with the development of a chela in Oxopoei. Cook 

 has already critizised (1. c, p. 258) Kraepelin's interpretation 

 of the joints of the palps in Oxopoei, maintaining that the 

 patellar part in Tartarides is also found in Oxopoei. 



