2o6 ENIOMOLOGISK TIDSKRIFT IQOI. 



hair of the same quality (his inter])retatioii of tliem as prol)al)ly 

 auditory organs is erroneous) on the inferior side of tlie fourth 

 joint (the patella), and this I have now seen on a leg situated in a 

 fortunate position. In four of in\ otlier species I have also 

 found seven tactile hairs on the same joints and inserted almost 

 on the same places as in A', iiiirabilis: the preservation of the 

 one species, A'. Grassii, was not good enough for an exact in- 

 quiry, but what 1 saw did not deviate from that in tlie other 

 species. 



1 shall now ])oint out the existence of otlier hairs or sete>i 

 which probably are sense-organs. On pi. 2 fig. 2 g is seen a 

 peculiar seta (s) originating towards the middle of the up])er side 

 of the metatarsus on the last pair of legs in K. Whcclcri. This 

 seta diverges but little from the upper margin of the leg, in its 

 whole length it is adorned with fine dots, which seem to be 

 exceedingly short liairs (the magnifying power of my microscope 

 is not high enough for an investigation); furtliermore it is hollow 

 quite out to the apex, which is obtuse. Judging from (unpul)- 

 lished) studies of hairs in other orders of Arachnids I believe this 

 seta to be an organ of sense. It exists in all the species but 

 is generally less thick than in A'. Whcclcri, and ist length pre- 

 sents good specific characters. In A. angiista it is exceedingly 

 long (pi. 3, fig. 3 h, s), inserted at a short distance from the 

 base of the metatarsus and reaching almost to the middle of tlie 

 last tarsal joint; in K. Whcclcri it overreaches but slightly the 

 metatarsus, and in K. mirabilis it reaches scarcely to the end 

 of this joint. — Several other hairs, especially on the tarsi and 

 metatarsi of the three posterior pairs of legs, are hollow through 

 most of their length, and the apex is turned sharply outwards, 

 but I am unable to decide if these may I)e sensory organs. 



On the posterior (exterior) side of the third metatarsal joint 

 in the first pair ol legs in K. Wheclcri 1 found a seta (pi. 2, 

 fig. 2 e, s), which is somewhat shorter than the longest hairs of 

 normal quality, but considerably tliicker than these, stifi" as a 

 spine, feebly curved and besides under rather high magnifying 

 power (600 times) showing a structure difierent from that of the 

 other hairs. This structure 1 have been unable to elucidate as 

 I could wisli, but it can be stated, tliat the seta is dotted witli 



14 



