476 M. A. Scheuten on some Mites and their young states. 



Naturelles/ 3me ser. tome xv. p. 166. From the supposed pre- 

 sence of ova, he regarded it as a perfect four-footed mite, aud 

 gave it the name of Phytoptus. His only evidence of these ova 

 was, that he saw roundish structures shining through the skin 

 of the animal. He describes the animal as white, so that it is 

 not transparent; and striated, so that its structure would be 

 still less distinctly visible. Even with transmitted light, a very 

 indistinct view of the interior can be obtained, and this is shown 

 by his own figure. In this we see what he regards as eggs, but 

 no trace of other viscera, for which, however, there is plenty of 

 space. 



In the interior of the author's larvae various rounded outlines 

 are seen, especially when glycerine is employed. In the upper 

 part of the body especially there is constantly a round clear 

 space, which also occurs in the same spot in the mite; then 

 follow irregular roundings, which are certainly nutritive or- 

 gans. 



The differences between Dujardin's larvse and those described 

 by the author are in non-essential points, so that they must be 

 regarded as species of the same genus. Dujardin describes his 

 as a very small white vermicle, 0' 15-0*23 mill, in length, and 

 0-035-0-045 mill, in breadth. The author's (fig. 1) is 0-10-0'18 

 by] 0'025-0'040. The whole body is covered with transverse 

 striae, which, when highly magnified, proved to be very firm 

 tubercular ribs, forming a strong shield, which could not be 

 ruptured by pressure, &c. The animal moved slowly with its 

 four short legs, which are inserted near the rostrum. According 

 to Dujardin, the body is narrowed behind, and terminated by a 

 bilobed sucker. In the author's species the body is of uniform 

 breadth, with a blunt termination, furnished with a pair of 

 long, undulated bristles. In turning round, the animal sup- 

 ports itself upon these. Between them there are two smaller 

 ones. The sides also bear some bristles, which appear to 

 support the long body when in motion. The legs are five- 

 jointed, and terminated by a long nail or claw. Dujardin de- 

 scribes this claw as acute and curved, with a feathered, triden- 

 tate structure beneath it. In the author's species it is trun- 

 cated, with a short, stiff bristle below it (fig. 2). The rostrum 

 (fig. 3) forms a truncated cone, containing a sucking-tube. Duges 

 says that he once pressed a long, curved, narrow lamella out of 

 the rostrum ; the author has repeatedly seen this lamella, which 

 is straight in his species. 



Dujardin found his larvse in the leaves of the lime-tree, into 

 which they had penetrated from above. The pear-tree leaves 

 had an opening beneath, and the excrescences of the lime-tree 

 observed by the author were also on the lower surface of the 



