78 



above mentioned secoud part of his valuable work on British 

 Oribatidae. 



My opiuion was changed, and I thought Notaspis lacustris (Michael) 

 was altogether different froin rny Eremaeus confervae (Schrank), but 

 being otherwise engaged at the time, I did not publish it. 



In July 1898 appeared Michaei/s Oribatidae, a number of Das 

 Tierreich. This induced me to revise my collection. The first part 

 of a New List of Dutch Acari appeared 5 September 1900 in the 

 Tijdschrift voor Entomologie, vol. 43, p. 150 — 171, in which I 

 poiuted out satisfactorily, I think, the necessity of admitting two 

 species, Eremaeus confervae (Schrank) and E. lacustris (Michael). 



In Michael's Oridatidae (Das Tierreich), p. 50, sub Notaspis 

 lacustris, I read not without surprise: »Oudemans identifies this 

 species with Acarus confervae Schrank, but does not give any 

 reason for doing so, except habitat." Now, this assertion is not 

 quite true. I described and drew a species which I considered 

 to be the same as Schrank's Acarus confervae, and expressed a 

 supposition that Michael's Notaspis lacustris were the same species. 

 Michael could immediately observe, in comparing my drawings and 

 description with his, that I had been mistaken, and that my species, 

 called by me Eremaeus confervae Schrank, was quite different from 

 his lacustris. Why then has he not adopted it in his Oribatidae 

 (Das Tierreich)? 



I repeat here, that my description and drawing of the pseudo- 

 stigmatic orgau, as given in vol. 39, p. 179, were wrong; I gave 

 a better description of it in vol. 43, p. 164. 



From Dr. A. R. Spoof of °Abo, Finland, I received 5 specimens 

 of the species in question. They are exceedingly light coloured. 

 They have all their pseudostigmatic organs. They have all the 

 lamellae and the pseudostigmata exactly as I have described and 

 figured them. But they differ from the Dutch specimens in having 

 long hairs on their abdomen. These hairs stand exactly on the 

 spots where I have delineated points in my figure (Tijdschr. v. 

 Entom. vol. 39, tab. 10, Fig. 2). It is remarkable that Dr. Spoof 

 found them in subsaline algae. 



