Ì94 (DR. A. C. OUDEMANS). LIST OF DUTCH ACABI. 



6. Koch cites of the genus Dermacentor only Hungary , Banat , 

 France, Portugal, Greece and Penssylvania as localities, whilst 

 he does not mention on which animals these species were found. 

 Perrier seems to deny the occurrence of Dermacentor in France, 

 for he says (Traité de Zoologie p. 1117): le genre Dermacentor 

 est exotique. » Remarkable at all events is the fact that I have two 

 species of Dermacentor found on birds in Utrecht (see above n". 3 

 and 4). 



7. Two specimens of Ixodes, presented to me by Dr. A. W. M, 

 van Hasselt , and found by him near Wageningen , were undoubt- 

 edly the Acarus tristriatus of Panzer (Faun. Ins. Germ. Init. 

 59 , 24) ; after closer examination they were immediately recognized 

 as nymphae of Ixodes ricinus Linn. Therefore I have noted down 

 Acarus tristriatus Panz. as synonym to Ixodes ricinus Linn. 



8. Several specimens of an Ixodes found on a deer in Apeldoorn , 

 which with the naked eye and with a pocket magnifying glass 

 were determined as Ixodes fuscus Koch , were after closer examin- 

 ation with the microscope nothing but Ixodes ricinus Linn, There- 

 fore I have noted down Pediculus cervi of Redi (also cited by Linné 

 in his genus Pediculus together with a true Pediculus) d^nà Ixodes 

 fuscus Koch as synonyms to Ixodes ricinus Linn. 



9. Several specimens of an Ixodes found on the squirrel , and 

 determined as Ixodes sciuri Koch, were by closer examination 

 with the microscope nothing but larvae and nymphae of Ixodes 

 ricinus Linn, I therefore noted down Ixodes sciuri Koch as syn- 

 onym to Ixodes ricinus Linn. 



10. A Lacerta agilis, which carried several Ixodes in the arm- 

 pits of its fore-legs, was caught by Dr. R, Horst in Zeist, 

 brought home and set in spirits to enrich the collection of the 

 Zoological Museum in Utrecht. I examined the specimens; they 

 were all nymphae of Ixodes crenulatus Koch , which I consider to 

 be synonym to Ixodes hexagonus Leach, Ixodes autumnalis Leach , 

 and Ixodes erinacei Aud. — They were not determinable as Ixodes 

 lacertae of Pagenstecher, 



11. On the Hood sucking of the males. The males of Riciniae 



