22 ARKIV FÖR ZOOLOGI. BAND 2. N:0 8. 



systematic character for this suborder, as in Amblypygi tliey 

 are found on other places, viz. on patella and metatarsiis of 

 the three posterior pairs of legs (Hansen, 1. c). 



Sensory hairs of totally different shape are found on the 

 tarsi — often also on the metatarsi — of the first pair of 

 legs. It is well known that these legs are useless for walking, 

 but evidently developed as organs of touch. In 1893 Hansen 

 (t. c.) pointed out the existence of very small, thick, clavate 

 hairs on about the most distal third of the strongly elongate 

 tarsus of the first pair of legs in Amblypygi; we are now able 

 to point out corresponding sensory hairs on the same tarsus 

 in all Uropygi. In Tartarides they are placed on the out er 

 (posterior) side of all six joints and besides on the upper and 

 the lower side, but their number is low, generally about three 

 on each joint; they (Pl. 2., fig. Id, s) are easily discernible 

 from common hairs, being very much thicker and somewhat 

 shorter than these; they are besides somewhat curved, with 

 the end blunt, vvhile their wall is thin and nearly vitreous. 

 In Oxopoei the sensory hairs are similarly distribiited on the 

 joints of the tarsus, and in Hypoctonus besides some hairs are 

 met with on the outer side of the di stal part of metatarsus, 

 but in this tribe the hairs are not only proportionately many 

 times smaller but even absolutely smaller than in Tartarides; 

 besides they are less curved and distally more slender, but 

 their end is yet blunt, and by their vitreous appearance they 

 form a contras t to the usual brownish hairs. 



In Schizomus Simonis the tarsus terminates in a very short 

 cylindrical rod which is much shorter than the surrounding 

 hairs ; in Oxopoei we found instead of the rod a kind of seta 

 which is as long as the surrounding ones. but considerably 

 thicker and somewhat curved. 



Finally we shall give a condensed description of the 

 enigmatic sensory organs known as »lyriform organs». We 

 undertook a detailed investigation of the occurrence of the 

 stripes or fissures in question on all parts of body and appen- 

 dages of a female Schizomus Simonis, but subsequently we 

 found that a full description of the situation of all the stri- 

 pes together with their direction and length must fill up 

 several pages and thus be disproportionately long as com- 

 pared with the importance of the matter. 



