(dr. a. C. OUDEMANS). new list of dutch acari, II. 19 



Genital anJ ventri-anal shields re- 

 mote S. hlrsutus (G. L. Koch). 



Genital and ventri-anal shields tou- 

 ching S. plumosus Oudms. 



One long hair on each shoulder, 



4 ditto on posterior abdomen .S. vepallidus (G. L. Koch), 



Not such hairs present . . . .S. miiricatus (G. L. Koch). 



15. Laelaps C. L. Koch and Hypoaspis Can. 



See about these generic names my Isotes on Acari, IVth Series, 

 Tijdschr. (I. Ned, Dierk. Vereen, ser, 2, v. 8. p. ... 



16. Hypoaspis pavidus G. L. Koch. 



This species is somewhat broader than the form called K. claviger 

 by Berlese. The body is more triangular , with rounded edges and 

 rounded corners. The hairs on the body are cullrate, like crooked 

 knives, exactly like those of H. claviger Beri. Those on the legs, 

 however, are spines. All the details, both of S and 2, are the 

 same as in H. claviger Beri. 



Therefore I consider //. claviger Beri, as a simple variety or 

 southern form of H. pavidus G. L. Koch. 



17. Hypoaspis cossi (Ant. Dug.). 

 (With Plate 2, fig. 22—26). 



Synonyms : 



1760. Fou de la chenille du bois de saule, Lyonet, Traité anat. 

 chen. bois du saule, p. 13. 



1793. Läuse auf glatten Raupen, Kleemann, Beitr, z. Naturg. 

 p. 349. 



1829. Tov, de la chenille du hois de saule, Lyonet, in Mém. 

 Mus., 18, p. 277, t. 14 (6), f. 11, 12, 14. 



1832. Pou de la chenille du hois de saule, Lyonet, Rech. anat. 

 métam. diff. esp. Ins. p. 45, t, 6, f. 11, 12, 14. 



