204 KNTOMOl.OGISK IIUSKKIKT 9OI. 



ved. But in spite of the deficiencies originating from these cau- 

 ses I believe that I can describe the six species so that they can 

 be distinguished with certainty from an\ form still to be disco- 

 vered, .^nd I believe that when — in a rather remote future 

 — the tropical and subtropical countries have been well explored 

 by able collectors, the number of species of the order Palpigradi 

 will amount to fifty or perhaps considerably more. 



The animals (of which always a portion should be put by 

 the collector into spirit at least not exceeding 65 %) are not 

 very easy to examine. I should advise Zoologists to lay them 

 in glycerine diluted with water on an object glass, and to intro- 

 duce a small, thin wooden wedge (cut for instance of the margin 

 of a match-box) under the middle of the back edge of the glass- 

 cover in order to prevent this from crushing or at least depres- 

 sing and deforming the animal. By moving the wedge forward 

 or backward the glass-cover is easily arranged so that it either 

 only touches the animal or presses it as much as desired, and when 

 the animal by the help of a hair is arranged in a direction at 

 right angles to the length of the object-glass, it can be rolled round 

 by slight pushing of the glass-cover to the left or to the right side 

 and thus become examined from all sides without damaging it. 



III. On some Structural Features and Characters. 



As almost nothing is known about S])ecific characters in this 

 order, and it is necessary for me to attempt to lay down a l)ase, 

 1 think it advisible first to consider the characters employed later 

 on in the description of the species in order to help future stu- 

 dents as much as possible. Thus we get a general view of a 

 series of structural features, and though this chapter is a rather 

 long one, I hope that it may render some service to the users 

 of the systematic descriptions of the species. — It may be added, 

 that practical reasons have induced me to apply the name palpi 

 to the second pair of appendages and the name legs to the four 

 posterior pairs. 



a. Sense-organs of the head. CiRASsi and later on Han- 

 .SEN and SoRKNSEN" have described peculiar sense-organs on the 



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