310 
ENTOMOLOGISCHE BERICHTEN. 
called Zwickia guentheri. The transverse slit is easily to 
recognize in individuals, cleaned and somewhat swollen 
by 1% caustic kali. Berlese in A. muscarum (Ac. Myr. 
Scorp. 11 a I. 39. 9) took thé anus for the genital aperture, 
and figures in A. fimetarius (1. c. 9. 7.) a longitudinal slit, 
that does not exist. Michael (Brit. Tyrogl. v. 1. p. 205) 
says: „The vulva is a mere longtudinal slit with protecting 
sclerites” that, in reality, do not exist. And of the species 
feronarium (called by him rostroserratus) : „The vulva is 
placed just posterior to the coxae of the fourth pair of 
legs. much further from the posterior margin; it is a 
mere slit, without chitinized labia, and is offen difficult to 
see”. Of the vulva of pyriforme „between the epimera of 
the third pair of legs”. And yet there existed already in 
1897 a drawing, representing a $ Anoetus, viz. in Berlese’s 
O rdo Cryptostigmata (Sarcoptidae), tab. XV, f. 6, 
where a tranverse slit on the right place is visible, without 
any explanation, however! 
A. 1. With line of demarcation between propodo- and 
hysterosoma. Anoetus Duj. 1842. 
A. 2. Without such line. Zwickia nov. gen. Type Anoetus 
guentheri OUDMS. 1916. Probably hereto also A. mus- 
carum L. 1758, which I have not had under examination. 
Arnhem. 
A. C. ÜUDEMANS. 
