2 42 ENTOMOLOGISK TIDSKRIFT ICI 7. 



found only on the fingers of the large chelae. The calicles 

 are well developed, but their opening is wide; the hairs are 

 extremely or very long. They have been found in all main 

 genera examined by me; they were mentioned — without 

 description — by Dahl in 1883 (^' P- 270), and in 1888 

 CronEBERG described them in a species of Chimes. 



In the Pt'dipalpi the trichobothria are found only on the 

 legs; they were discovered in this order by me in 1893 (H. 

 J. H. a, p. 155 and 175). In the suborder Uropygi, both in 

 Oxopoei and in Tartarides, they are only found at the end 

 of the tibia on all four pairs of walking legs, two calicles on 

 the first tibia, and a single calicle on each of the others 

 (Hansen & Sorensen c, p. 21). In the Amblypygi the 

 trichobothria are much more numerous and their arrangement 

 very different. The patella of each of the three posterior 

 pairs of legs has two long and very fine trichobothria protrud- 

 ing from well developed calicles, and a comparatively large 

 area of the integument around the opening of each calicle 

 is adorned in a peculiar way as if it were scaled. Further- 

 more the upper side of the metatarsus of the same legs has 

 on the proximal part some calicles, and towards the distal 

 end a number of calicles arranged in two short rows much di- 

 verging towards the end; on the upper side of the tibia is 

 found a single calicle near the apex (H.J. H.a. p. 155 — 156). 

 First pair of legs and the palps without trichobothria. 



In the order Palpigradi trichobothria are only found 

 on first pair of legs; all species examined by me have seven 

 such hairs on each of these legs distributed on sixth, seventh, 

 ninth and eleventh joint. They were discovered by GraSSI 

 in Koenenia viirabilis Grassi, who was inclined to interpret 

 them as auditory organs; later they have been mentioned 

 by Hansen & Sorensen [a, p. 231) and as occurring in 

 several species by HANSEN {Ik p. 205). 



In the Araneœ the »Hörhaare» — trichobothria — occur, 

 according to F. Dahl {b, p. 2—4) on the upper side of the 

 legs and the palps, but generally only on tibia, metatarsus, 

 and tarsus, and sometimes they at"e reduced or wanting on the 

 tarsus; in Pachygnatha and Tetragnatha trichobothria shall also 

 occur on the femora in two rows near their base. Dahl has sev- 



