HAXSEX AXD SOREXSEN, THE TARTARIDES. 5 



we emphasized characters of so higli importance, that the 

 distance of this order from the Tartarides — which it resemb- 

 les in the composition of the dorsal portion of cephalothorax 

 — is considerably greater than that between Amblypygi and 

 Araneae. Finally Cook's paper gives a tabular view of the 

 >>sub-classes» and orders of the Arachnida (Acari excepted), 

 but its quality is so poor that it scarcely deserves any mention 

 at all. We can not refrain from producing the remark that 

 rather freqiiently papers are published attempting to revo- 

 Jutionize the classification of on order or a class, but showing 

 too miich lack of real knowledge of literature or nature, too 

 much want of circumspection or real account of the numerous 

 structural features which ought to be taken into considera- 

 tion. But stich papers convey the impression that their 

 authors produce them essentially in order to establish new 

 denominations which generally are in reality superfluous or 

 sometimes even obnoxious. 



In the volume dealing with Arachnida (published 1900) 

 in .»The Fauna of British India, including Ceylon and Burma» 

 R. I. Pocock spends 5 pages (pp. 118 — 122) on the »suborder 

 Tartarides». He overlooked the dorsal plates of the first free 

 thoracic segment; besides we disagree as to some other of his 

 statements. He considers, correctly, Schizomus crassicaudatus 

 Cambr. to be the male and S. tenuicaudatus Cambr. to be the 

 female of the same species; furthermore he establishes a new 

 form, Trithyreiis suboculatiis, but it is, unfortunately, founded 

 only on a female specimen which certainly is not adult. 



III. External Structure of the Tartarides. 



As already mentioned, all forms seen by us or described 

 in the literature are so closely allied that at most two genera 

 can be maintained, and the difference between these is even so 

 slight, that the value of Trithyreus is only that of a subgenus. 

 We have dissected two specimens af our new species Schizo- 

 inus Simonis, as it is the main base of our text which yet 

 embraces the entire family. For there is no reason to suppose 

 that structural features (for instance the number of spirades 

 or essential points in the occurrence of lyriform organs) which 



