82 A. e. OUDEMANS, XOTES ON ACAEl. 



d i c i d a e und S a r c o p t i d a e, 1899, p. 8 : »In manchen 

 Abteilungen kommt Parthenogenesis vor {Aìialytae)« safely 

 can be crossed. 



Now I am advanced to 1895 in which year Trouessart 

 publisher! in the American Naturalist, p. 682, an article 

 entitled: »Picobia viUof>a (Hancock) is Si/rittgophilus bipecti/iatus 

 (Heller)". 



The proper subject does not matter us ; I will only 

 transcribe the passages concerning another so-called case of 

 parthenogenesis. 



(p. 683): »1 must add that, from my observations, the form 

 named Si/ìnìujophlliiK is not adult and represents only the 

 i^i/rinijolnal and partite nO(jeiietu' form of a species of Chei/lelus 

 described by Dr. S. A. Poppe (from Vegesack) under the 

 name of' Chei/ietus nnnieri which is found also in the quills 

 of the feathers of the birds enumerated priviously, feeding 

 on the Sarcoptides {Analijesinae) which live there habitually." 



»It is not possible to find any diflferential sexual character 

 between the two forms distinguished by Mr. Hancock as male 

 and female." 



»In the interior of the quill, the 'Sijrlnr/ophUi feed, accor- 

 ding to the manner of the Anahjesinae, on the marrow (or 

 pith) of the feathers. The transformation into adult Cìieìjletus 

 takes place likely out of the quill, which explains why the 

 syringobial form is found, but rarely, in the plumage, 

 outwardly to the feathers, as in the case observed by Mr. 

 Hancock." 



Again in 1899 Mr. Tuoikssart published a memoir entitled : 

 »Les acariens et les insectes du tuyau des plumes; la 

 parthénogenèse syringobiale." It appeared in the »Volume 

 jubilaire" published at the occasion of the fifty-years' existence 

 of the Société Biologique de Paris. I will pass silently all 

 the passages and phrases in which Mr. Troi'essaiit again 



