78 A. e OÜDEMAXS, NOTES ON ACARI. 



Ill 1901 the first volume of British Tyroglyphidae 

 of the hand of the same author appeared, and, alas, though 

 several eases of breeding are described, of parthenogenesis there 

 is no question. Ever, when a female was bred from a nymph, 

 immediately a male was put into the cell. 



In Orihatidae and Tyroglyphidae males are very common, so 

 that in all probability parthenogenesis does not take place — 

 but this is only a supposition of mine. Proof is wanting 

 here. 



As far as I know it was not before the year 1894 that 

 Trouessart (Ann. S o c. E n t o m. France, Bulletin p. 

 CXVII) pleaded the parthenogenesis of Syringobia (a genus of the 

 »Ancdgesinae«). In the quills of Totanus calidris L. he found 

 nnmerous mites, and supposing that they were of the same 

 species, he thought to observe : P. eggs with shell, 

 2^. e ff 2 s without s h e 1 1 ; 3'^. n o r m a 1 1 a r v a e ; 4^. 

 anomalous larvae; 5°. normal nymphae; 6*^. 

 anomalous nymphae; 7". normal nubile fema- 

 les (= d e u t o n y m p h a e) ; 8". normal adult females; 

 9". anomalous f e_ males; 10". normal or h eter o- 

 morphous males; 11". anomalous or homeo 

 morhous males. 



Query: No anomalous nubile females or ano- 

 malous de u to nymphae? 



»C'est la présence de deux formes de femelles qui a d'abord 

 frappé mon attention ; les caractères propres à l'espèce sont 

 d'ailleurs conservés sur toutes les formes, de telle manière 

 qu'il est impossible de croire à l'existence de deux espèces 

 vivant côté à côté.« 



»La mue qui transforme la nymphe syringobiale en femelle 

 adulte est surtout très instructive au point de vue qui nous 

 occupe ici.« 



