254 ARACHNOIDEA. 



CASE and palpi, and witli the characteristic chitonous bands which 



XIV. 



support the legs in the sarcoptidse, although in a less degree. 

 Claparede, although he does not say that he has seen the insect 

 itself, boldly says (loc. cit.) that Furstenberg is wrong, both in his 

 figure and his description, and disputes the existence of these 

 mandibles, and declares it to be a Hypopus. There is certainly 

 much in it that is characteristic of Hypopus, but unless Furstenberg 

 has been incredibly careless and inaccurate, and we are at liberty 

 to re-draw it in accordance with our own notions of what is most 

 probable, it seems impossible to bring it in the same line with 

 that genus. We quite agree with Claparede, however, that it 

 must be near it, and have dealt with it accordingly. 



Furstenberg mentions that he found a similar mite under a 

 number of Horse Mites (Dermatokoptes), which he got from a 

 horse suffering from the itch. The same species turned up again 

 in Paris in 1867. In the Universal Exposition of that year a 

 magnificent ox, splendidly stuffed, was a conspicuous object in 

 the glass-case of M. Deyrolle, the naturalist. Regarding this ox, 

 M. Megnin learned from M. Deyrolle that when he was occupied 

 in mounting the skin, which had been left for eight days in a 

 bath of alum, he was witness of a singular phenomenon. The 

 skin became covered with myriads of very small white Acarids 

 scarcely visible, and which gave the effect on the skin of a dusty 

 matter. He collected numerous specimens which he gave M. 

 Megnin, who on seeing them immediately recognised a Hypopus 

 which resembled line for line the Homopus of Furstenberg, 

 only its carapace was finely granulated, a detail which he sug- 

 gests the German author had perhaps neglected, and moreover he 

 found it impossible to make out the jaws and palpi which he de- 

 scribes. The mouth was simply a *' rounded opening, closed as by 

 a ' clapet ' by a movable lip furnished with two hairs." * 



* Probably here should follow the genus Heteropus, which we have placed 

 at the end of the Tyroglyphidae as of uncertain position, not being able to make 

 up our mind as to iis most suitable place. 



