256 (dr. a. C. OtTDEMANS) LIST OF DUTCH ACARI. 



49. Proctophyllodes sp. 



On Circus ruf us , Utrecht, 11. 



Pterodectes Rob. 1868. 



50. Pterodectes cylindricus Rob. 



On Porzana porzana, Sneek, 5. 



(P t e r c 1 u s Haller , 1878.) 



51. (^Pterocolus) corv'mus Kogh. 



On Corvus comix, Sneek, 1. 

 On Porzana porzana , Sneek , 5. 



52. {Pterocolus) corv'mus var. 



On Sturnus vulgaris, Utrecht, 5. 



On Plectrophanes nivalis, Utrecht, 11. 



53. {Pterocolus) orti/gometrae Can, 



On Corvus corone , Sneek , 5. 



54. (Pterocolus) sp. — (an corvini var. ?) 



On Muscicapa grisola, Utrecht, 6. 



Alloptes Can. 1879. 



55. Alloptes hisetatus Haller. 



On Sterna Jdrundo , Sneek, 4. 



ANALGESEAE MÉGN. Tr. 1883. 



Dimorphus Haller 1878. 



56. Dimorphus bifidus Nitzsch (^ginglymurus Mégn.) 



On Thaumalaea pietà , The Hague , 1 , 



57. Dimorphus oscinum Mégn. (non Koch.) 



On Chlorospiza chloris, Utrecht, 6. 



58. Dimorphus asternalis Mégn. 



On Columha domestica, Utrecht, 4, 10. 



59. Dimorphus sp. 



On Aix sponsa, The Hague, 10. 



60. Dimorphus sp. 



On Cypselus apus , Utrecht, 5. 



