GALL MITES, 373 



On the common Strawberry. 



Phytoptus Sp. 

 By this species spherical short and thickly-haired purple red 

 galls, at the most i\ millimetre in size, are produced in such 

 numbers on the upper side of the leaf, that the whole surface of 

 the leaf seems to be covered with them. The entrance to the 

 gall on the underside is small and somewhat hairy. Inside are 

 some single scattered short pegs, no doubt remains of hairs, but 

 with no actual hairs. The gall mite living in it is yellowish. 



On Salvia pratensis. 

 Phytoptus Sp. 



Kaltenbach mentions that in the middle of July he found galls 

 on the lower leaves of Sylvia pratensis, which appeared sometimes 

 as simple, sometimes as groups of galls. They appeared both on 

 the upper side of the leaf, and on the edge. The gall is puckered, 

 uneven, and very convex, and the under aperture is covered with 

 white felt. Of mites, he says that he only found one small larva 

 between the inner hairy coverings. 



Frauenfeld, in 1865, in the '' VerhandL Zool. Bot. Gesellsch in 

 IVien,'^ describes the following additional species, viz., Phytoptus 

 granulatus, campestricola, and euonymi. And in the same 

 journal, in 1869, vol. xix., a species found on Bromus erectus. 



Thomas gives an account of the mischief done by different 

 species in Switzerland (1869 and 1871). 



In America, Dr. Shimer found what was obviously a Phytoptus 

 on the leaves of the white maple, and made a new genus for it^ 

 which he called Vasatis. 



Another aid to the study of these gall-making mites remains to 

 be tendered. Many cryptogamic growths on leaves are so like 

 the work of insects, that those who are unacquainted with them 

 are very apt to be deceived by them. We have constantly such 



