358 ARACHNOIDEA. 



CASE There is another mite gall which is found on the sycamore 

 and various maples. It produces cottony clusters of hairs on 



Ccphaloneon myriadeum on maple leaf. 



the underside of the leaf, and has been named by the older 

 botanists, Erineum acerinum, Pers. The mite that produces it 

 is whitish. Erineum purpurascens is considered by Herr Low 

 to be distinct from this; Kaltenbach and others think it the 

 same. Another species, named by Bremi Cephaloneon solitanum, 

 is described as growing on the upper side of the leaf in the angles 

 of the ribs. 



IJASE Phytoptus pyri (Typhlodromus pyri, Sckeuten).—!. Sketch of leaf of pear 



j^^^ * tree bearing galls of ditto ; 2. Specimens of ditto ; 3. Magnified section 



3—5- of gall of ditto ; 4. Magnified sketch of Phytojjtus, the supposed larva 



of Typhlodromus pyri, copied from Scheuten's figure; 5. Magnified 



sketch of a Gamasus, supposed by Scheuten to be the perfect form of 



Typhlodromus pyri. 



This is a common affection on the leaves of the pear tree in 



