A. C. OUDEMANS, NOTES ON ACAKE. 79 



.-■■Si Ton examine la peau mince et transparente que cette 

 nymphe abandonne a la suite de cette transformation, o n 

 constate que cette jieau est totalement dépour- 

 vue de l'ou vertu re postanale qui correspond 

 à la poche c o p u 1 a t r i c e, et qui est toujours très visible 

 sur la 2^' nymphe normale ou femelle nubile, comme c'est la 

 règle chez les AnaUiesinae.« 



Consequently there is also an anomalous d e u t o- 

 n y m p h a not mentioned above ! 



Finally Trouessart results: 



»Nous sommes donc en présence de femelles qui se repro- 

 duisent sans fécondation, c'est à dire de femelles 

 p a r t h e n g é u é t i q u e s. « 



And he communicates his hypothetical idea how the different 

 forms of mites behave during the stay of the bird in its cold 

 native country, during the voyage of the bird and during its 

 residence in warmer regions. 



I have now proceeded to a point where I am obliged to 

 discuss the matter, but before doing so I must first tell my 

 readers that I am engaged in a revision of the known 

 Cheletidae and description of several new genera and species. 

 For this purpose I have prayed Mrrs. Michael, Poppe, 

 Trouessart and Berlkse to send me their collections for exami- 

 nation ; they courteously beared my pray. Mr. Trouessart also 

 put in my hands his preparations of Si/riìigophilus (a genus of 

 Cheletidae) caught by him on Totaiius calidris. These prepara- 

 tions contained also I may say the greater part of his collec- 

 tion of Syringobia chelopus, the mite in question. I am there- 

 fore sure that what I have observed, is examined on t h e 

 same individuals as those on which Mr. Trouessart 

 has based his communications about parthenogenesis, homoe- 

 omorphous males, etc. Really 1 found in these preparations 

 1". eggs with shell, 2 '. larvae, 3". protonymphae, 4°. deutonym- 

 phae, 5". adults (males and females) of the authentical Syringobia 



