HISTOEY OF LTTEBATFRE. 17 



liypopial stage in the genus Glycyphngus. This subject 

 also is fully dealt with in the chapter on development, 

 so that only the names of Megnin's highly interesting 

 papers are given here. 



Dr. P. Kramer, of Magdeburg, who has contributed 

 so largely to our knowledge of the Acarina, wrote his 

 first paper which need be mentioned here in 1876;* it 

 was a collection of various short studies, many of them 

 very interesting, upon the Acarina. It contained the 

 first attempt to form a separate genus to receive the 

 creatures now known as Histiostoma. Kramer, how- 

 ever, in this paper called the genus Phyllostoma, a name 

 which was pre-occupied, and which he subsequently 

 altered to Histiostoma. Kramer apparently at the time 

 supposed himself to be not only the founder of the new 

 genus, but also the discoverer of the creature, having 

 overlooked Megnin's prior paper above referred to. 

 Kramer in this paper also makes a useful comparison 

 of the mouth -parts of his new genus with those of 

 Cheyletus, Tyroglyphus, and other Acarina ; he also 

 criticises Claparede's contention that Hypopus was the 

 male of Tyrogtyphw, and correctly concludes that the 

 contention was erroneous. 



In 1880 Kramer published a paper f the name of 

 which implied that it was upon the immature stages of. 

 GtycypJiagus. The paper contains useful information 

 relative to the coition and larval and nymph al develop- 

 ment of the creature which the author was observing ; 

 but that creature was not really a Glycyphagus, and was 

 not ever considered to be one by any other writer known 

 to me ; it was the Acarus now known as Garpoglyphus 

 anonymus. Kramer was not quite right as to the 

 mode of coition, and had apparently not seen my own 

 paper of the previous year, in which the mode of coition 

 in Glycyphagus is correctly given. 



* " Zur Naturgeschichte der Milben " in 'Arch. Naturg.,' Heft 1, 

 p. 36. 



t " Ueber die post-einbryonale Entwicklung bei der MilbeDgattung 



Glyciphagus," in ' Arch. Naturg.,' 1880, pp. 102110. 

 2 



