6 H. J. HANSEN. 



hothouses in Copenhagen ; eight new species have been 

 collected by two other Danish zoologists, viz. three by Dr. 

 F. Meinert in Algeria and Venezuela, and five species by Dr. 

 Th. Mortensen in Siam ; it may be added that it was the 

 arrival in 1900 of the fine collection secured by Dr. Mortensen 

 which induced me to study the Palpigradi, Pauropoda, and 

 Symphyla. On my request Dr. F. Silvestri kindly lent me a 

 good collection, especially all the animals described here 

 from the southern countries of South America ; furthermore, 

 specimens have been benevolently sent me by the Director, 

 Prof. E. Ray Laukester, from the British Museum, by Prof. 

 E. L. Bouvier from the Museum in Paris, by Prof. Max 

 Weber from the Museum in Amsterdam, by Mr. R. I. Pocock 

 (London), Mr. Carl Boruer (Marburg), and Prof. W. M. 

 Wheeler (Austin, Texas). I beg all these gentlemen to 

 accept my sincere thanks for their valuable aid. 



The collectors of Symphyla should put the animals in spirit 

 of about (jo per cent., and at most not exceeding 70 per cent. 

 When- the specimens are to be examined they must be put in 

 glycerine somewhat diluted with water on the object-glass, 

 and the glass-cover ought to be supported by a small wooden 

 wedge to prevent flattening of the specimens; I have described 

 my method in the paper on the Pauropoda ('Videnskab. 

 Meddelelser fra den Naturh. Forening iKjobenhavn' for 1901, 

 published March, 1902), and refer the readers to the chapter 

 in question (pp. 327, 328). The animals must be examined 

 both vertically from above and from the side, and it is often 

 necessary to use a comparatively high magnifying power 

 (200 to 500 times). The reol shape and relative length of the 

 claws are often difficult enough to observe, and in order to 

 produce correct drawings I have generally found it necessary 

 to cut off the left leg of the twelfth pair (if this Avas broken 

 the penultimate leg Avas chosen) and one of the first pair, if 

 this is well developed : often I also cut off the right leg of the 

 last pair to examine and draw the claws from the inner (the 

 posterior) side as those ol' the other leg. A glance on the 

 plates will show that of nearly all species I have drawn the 



