GALL MLTES. 



137 



CASE he said, with reason, were scarcely to be distinguished from the 

 vegetable filaments but for their movements. No doubt, says he, 

 it was the outer form or habitus of this animalcule that induced 



Sa'low leaves with galls produced by I'tiycoptus salicis. 



Section of sallow mite gaii. 



Latreille to refer it to Sarcoptes when M. Turpin furnished him 

 with his drawings ; but a more minute research, although very diffi- 

 cult by reason of the excessive smallness of the animal, showed :~ 

 first, that the conical sucker was flanked by two thick short ap- 

 pendiculated palpi, similar to those of Tetranychus ; secondly, 

 from this sucker there sometimes (once) came out by compression 

 a curved plate or blade, narrow and long ; thirdly, the feet were 

 in seven parts, ot which the third, or the thigh, was the thickest 

 and longest, and the seventh on the contrary much reduced, 

 very short and probably terminated by two claws, but certainly 

 not by a caruncle. Thus, if the form of the palpi, the mandibles 

 and feet, were considered, he said this mite ought to be classed 



