227 



Not less curious is the variety, of which I found only a nymph. 

 In stead of a bifurcate frout-hair before the crista, it is characterized 

 by a single hair. 



We may imagine thus the lost of this hair and eventually of 

 the whole crista, and we have a new species! 



12. Glycyphagus prunorum Hering. 



Type of the genus. 



4838 Glycyphagus prunorum ïïering, Kratzm., p. 619, t. 45, f. 16, 17. 



1847 Van Leeuwen, Verh. Schurft d. Dieren, p. 10. 



1867 Glyciphagus prunorum, Fumouze et Robin, in Journ. Anat. 



Physiol., p. 36 (sép.) 



1877 Murray, Econ. Entom., Apt., p. 277. 



1882 Glycyphagus prunorum Haller, in Jahresh. Ver. vaterl. Naturk. 



Württ., p. 297. 

 Though Mégnin identifies this species (Les parasites et les maladies 

 parasitaires, p. 139, 1880) with Gl. domesticus de Geer, and Canes- 

 trini (I Tiroglijidi, p. 19; 1888; and Prospetto dell' Acarofauna 

 ltalia?ia, v. 3, p. 383; 1888) with GL spinipes Koch (= cadaverum 

 Schrank), Michael (British Tyroglyphidae, v. 1, p. 246; 1901) 

 poiuts out that he is of quite another opinion, viz, that it is a 

 different species. I think Michael is right. His arguments are 

 indisputable. 



13. Glycyphagus hyalinus (C. L. Koch.) 



1841 Acarus hyalinus C. L. Koch, Deu. Cr. Myr. Ar., fase. 32, n° 19. 



1842 CL. Koch, Ueb. Arachn. Syst. v. 3. p. 120. 



1864 Kirchner, in Lotos, p. 76. 



1867 Glyciphagus hyalinus Fumouze et Robin, in Journ. Anat. 

 Physiol. p. 44 (sép.) 

 Though R. Canestrini (in G. Canestrini, Prospetto dell' Acaro- 

 fauna Italiana v. 2, p. 230; 1886) identifies this species, with 

 Ereynetes polymitus C. L. Koch, I coufess I cannot admit that 

 Koch should have delineated and described a copulation-tube, if 



