342 



ARACHNOIDEA, 



CASE outlines were seen by M. Scheuten, especially when glycerine 

 was employed. In the upper part of the body particularly there 



Phytoptus, from Erineum rubigo 

 on lime tree leaves (Flexipalpus 

 tiliae of Scheuten). Copied 

 from his figure. 



Badly drawn. Tetranychus tiliae, erroneous'y sup- 

 posed by Scheuten to be the perfect form of ditto 

 (Flexipalpus tiliae of Scheuten). Copied from 

 his figure. 



is constantly a round clear space, which also occurs in the same 

 spot in the mite : then follow irregular roundings which, says he, 

 are certainly nutritive organs. But merely to assert this is no 

 proof, and the objections to Dujardin's statement are obviously 

 weak. He objects that it could not be transparent, because 

 Dujardin has described it as white and striated ; and yet he him- 

 self immediately, not only confirms the transparency, but describes 

 the very bodies that Dujardin saw. All who have seen these 

 creatures know that they are semi-transparent, and that you may 

 see the interior, as it were, through a milky glass. 



It is not irrelevant to the question to add that M. Scheuten 

 describes and figures another Gamasus under the name of Sannio 

 rubrioculus, both in what he calls its young and mature stages, 

 and that both the young and the old are furnished with eight 

 legs. From this and some other minor indications, it rather 

 seems to us that M. Scheuten had only taken up the study of the 

 Acaridae incidentally, and that his statements can hardly be 

 accepted as right interpretations of what he saw, without con- 

 firmation. 



Next, in 1864, Von Landois described from a new species 



