198 KNTOMOLOGISK TIDSKRIFT I9OI. 



lieves that the thorax in Palpigradi and other orders of Arach- 

 nids consists of tliree se.iiments, and he promises to prove this 

 view in a subsecjuent more vohiminous paper on the structure of 

 Koenc7iia. The discussion of this (juestion 1 leave completely 

 to my colleague Dr. W. Sorensen who years ago announced a 

 treatise on the segments of the body in all orders of Arachnids. 

 I shall only add that I do not accept the feature mentioned by 

 Borner as an oblique suture on the carapace above the fourth 

 pair of appendages, a suture described as incomplete and which 

 > keineswegs das Segment des 4. Beinpaares ganz vom Carapax 

 trennt»; I consider tliis suture to be only a lateral folding of the 

 skin, originating, when present, from (juite other grounds than a 

 rudimentary segmental division. 



In his description of the abdomen I find but little of inter- 

 est. He correctly states that the lateral portion of some seg- 

 ments is without setœ. In the group of spine-like setc^e on the 

 ventral side of the fourth segment he counts five; we had written 

 six, and later on I had observed both numbers. But when he 

 applies the name »Sinnesborsten» both to these and to the well- 

 known seta; on the ventral protuberance of the sixth segment, I 

 disagree: he does not set forth any ground for the name, and I 

 have seen numerous shapes of sensory setœ in Arachnids and 

 elsewhere, but never any one of these forms, and they do no 

 look like sensory organs. 



In a foot-note to his description of the abdomen (p. 551) 

 he points out, that the animal described by Wheeler as A', mi- 

 rabilis is another species, which he even establishes as the type 

 of a new sub-genus; he names it ProkocncJiia Wheelcri. He has 

 not seen any specimen and refers only to Wheeler's description 

 and drawings. But the result is, and must be, ])artially erroneous: 

 he could not detect that the animal described by Wheeler as 

 the female is in reality the male, and that the specimen consi- 

 dered by Wheeler to be i)erhaps the male of K. viirabihs, 

 l)elongs to a third, very aberrant species. Of course I must 

 adopt the name Wheelcri for the one species \ but I suppress 



* After this jiapcr was written and after the plates were finished I re- 

 ceived a copy of a ]ia]>cr on this species. The author, Miss Ai'GUSTA Ru- 

 <;i<:ek. proposes also the name K. M'heeleri lor the species, but her paper being 



6 



