62 LIST OF DUTCH ACARÜ. 



The fact is striking, indeed. Wiiat may have been the reason 

 that the Scandinavians de Geer , Linné and his discipels denied 

 Müller's paper? Because iie was a Dane? 



Müller does not mention in his work about Hydrachnids the 

 title of his Enumeration of the water mites of 1769. I have in 

 vain searchetl for this title in bibliographical works , either in works 

 on Acari, or in monographs on Hydrachnids. 



5. In 1830 Perty found a species of mite, to which he gave 

 the name of Phthlracarus contraotUls. He made several drawings 

 of it and sent them to his entomological friends. It was not before 

 the year 1841 , that he published his finding in his work entitled 

 Allgemeine Naturgeschichte als philosophische und Humanitätswissen- 

 schaft für Naturforscher, etc. 3d Vol. p. 874. His mite was very 

 curious^ and could not be placed into one of the genera known to 

 him; so he gave it the name, which I have already mentioned. 

 But Perty also made a group apart for his mite, which he called 

 the family of Phfhlracarea. As he did not publish the drawings-, 

 Claparède asked him for them and should like to publish tbern. 

 Claparède immediately recognised the mite to be a kind of Hop- 

 lophora , hut as he did not know any HoplopJiura with three claws, 

 he doubted of the correctness of Perty's observation, and declared 

 PhtJùracarhs to be a synonym of iloplophora Koch. Now since 

 Berlese refound a llojjiuphora with tree claws, the genus P/^/^Am'üï- 

 canis of Perty must be rehabilitated , and the name Tr'dia which 

 Berlese gave to his tridactyle HoplopJiora is only a synonym of 

 Phtlùracarus Perty. -- As to the name Phthlracarea , I am of 

 the opinion , that , since the group of Orlbatei is divided into some 

 smaller groups , the one of which contains the genera Hoplophora 

 Koch and Phthlracarus Perty (= Tritla Berlese), the name 

 Phthlracarea must be kept for this group, and that there is no 

 reason to give to this group another name, viz: lioplopiiorlnae. 



6. — The name Hoplophora Koch, 1836, cannot be kept, as 

 Perty used this name already in 1830 for Orthoptera, and Germar 

 in 1833 for hlemlpUra. 



7. The name Notaspis Herm., 1804, is synonymie OriLates Latr. 



