165 



Scorpions. 



An abstract of M. L. Dufour's memoir ou the anatomy of the Scorpionidoe, has ap- 

 peared in the Ann.Sci. Nat. 3rd ser. xv. 



A memoir by M. Duvernoy on the generative organs of the scorpion, was read be- 

 fore the Academie des Sciences on the 7th of October, 1850. 



Mites. 



The species of mites infesting sugar, cheese, meal, and the human body (the itch 

 insect), have been described and illustrated in the ' Pharmaceutical Journal,' Vol. x. 

 No. 8). 



The fact of a species of Acaridae (Argas reflexus) living nearly two years and a 

 quarter without food, is stated by M. Giuliani, (Ann. Soc. Ent. Fr. ix. p. lvi.) 



A memoir on the male of the Acarus Scabiei, and on the different modes adopted 

 by the two sexes in their attacks on the skin, was read before the Academie des Sci- 

 ences on the 20th of October, 1851, by M. Bourguignon. 



An extended memoir by M. F. Dujardin has appeared, on the species of Acaridae 

 destitute of a mouth, and generally furnished with suckers at the extremity of the under 

 side of the body, which have been formed into the genus Hypopus, but which the author 

 regards as the young of species of the genus Gamasus. These Hypopi are generally 

 found infesting the bodies of other insects, of various orders. Highly magnified figures 

 of several of them are given, (Ann. Sci. Nat. 3rd ser. xii. 243). In a subsequent arti- 

 cle (Ibid. 259) the author describes 11 of these species or supposed larvae of Gamasi. 



M. Laboulbene has published the descriptions of several new species of Acaridae, 

 and of a new species of Hydrachna, in the Ann. Soc. Ent. Fr. ix. 3rd trim. 



M. Vogt has given an account of a water-mite (Hydrachna Concharum, Baer), 

 which lives within the palleated cavity of the Naiades, the eggs being deposited in the 

 branchiae of these Mollusks, it being rare in winter to open a mussel without finding 

 vast numbers of them, (Ann. Sci. Nat. 3rd ser. xii. 198). 



The development and natural history of a species of water-mite which parasitically 

 infests the Anodontae (Atax Ypsilophora) has been described in detail by Van Beneden, 

 (Mem. Acad. Bruxelles, tome xxiv.) 



M. Dujardin has published the description of the 4-footed Acaridae which are pa- 

 rasitic on vegetables, especially those of the galls of the leaves of the Tilia and sallow, 

 which, contrary to the opinion of M. Duges, he is not inclined to regard as the young 

 of the 8-footed Dermanyssi. He accordingly forms them into a distinct genus, named 

 Phytoptus. (Ann. Sci. Nat. 3rd ser. xv.) 



The species of Acarida? residing in the galls of different vegetables, regarded by 

 Duges as the young state of species of Tetranychus, have also been considered by Von 

 Siebold as perfect animals, and formed by him into a distinct genus, named Eriophyes, 

 (Proceedings of the Entom. Sect, of the Nat. Hist. Soc. of Silesia, for 1850). 



M. Kobineau Desvoidy addressed a memoir to the Academie des Sciences on 

 the 22nd of September, 1851, in which he asserts that the prevalent disease of the 

 vines, generally attributed to the Cryptogamous Oidium Tuckeri, in fact results from 

 the attacks of an Acarus, to which he gives the name of A. Caldiorum, allied to A. 

 telarius, Linn. ! And further, that the potato-disease is caused by the attacks of ano- 

 ther species of Acarus, which he names A. Solanorum ! ! 



