80 A. e. OÜDKMANS, NOTES ON ACARI. 



clielopus-, I was in the opportunity to make a splendid series, 

 especially of the male (the heteromorphoiis one of Trouessart) 

 of which at least twelve different forms are arranged by me 

 in a row, differring in length of body and in thickness of the 

 4th pair of legs. But all these males are so-called 

 h e t e r o m o r p h u s ones. I also found l'^. within another 

 female a well developed embryo in an extremely thin membrane, 

 1 may thus say an egg without shell, 2o. larvae, 3o. proto- 

 nymphae, 4'\ deutonymphae and 5". adults (the so-called homoe- 

 omorphous males and anomalous females) of quite another 

 species. That this species is really the anomalous 

 series of Syringobia chelopus (sensu Trouessarti) and not 

 another one is proved by the drawings of Berlese (A c a r. M y r. 

 Sc or p. I tal. vol. 9, fase. 88, no. 2) made by him after the 

 same preparations! The species even is so quite different 

 from Sijrwgobia chelopus, that I felt compelled to create a new genus 

 for it: Fliitarcliusia (Entomologische Berichten, ?io. 19, p. 173). 

 Why now, you may ask, am I unwilling to adopt Mr. 

 Trouessakt's idea of the two series of stages belonging to each 

 other, and of parthenogenesis? Well, I will try to convince my 

 readers. Fi- stly then the two series are complete, both with 

 their own male. Secondly the so-called homoeomorphous male 

 of the so-called normal series, does not belong to it, but to 

 the so-called anomalous female, because they have the same 

 distribution of hairs, the same shape of fore-legs and the 

 same mandibles (enormous ones). Thirdly where one of the 

 two series — in fact the anomalous one — is the partheno- 

 genetic one, like in Branchipodiclae, Polyphemidae, Lynceidae, 

 Dap/miidae, Sididae, Cypridae, Coccidae Aphidae et Cynipndae, 

 this series has no mal e, so it must be partheuogenetic ! 

 and Fourthly the so-called anomalous deutonymphae really 

 are provided with a copulation-hole. This hole is really 

 postanal, not dorsal, however but ventral, hidden between a thin 

 membrane expanded between the two short abdominal lobes, 



