1906 ENTOMOLOGICAL SOCIETY. 61 



Eriophyes sj). This gall is so different in structure from the typical 

 Eriophyes fraxini gall that I have no hesitation in placing it as a different 

 species. The galls are produced almost invariably along the principal veins. 

 Dorsally ttiey are light pinkish white in color, about 2.5 by .75 m.m. and 

 growing on eitner side of the vein. The surface of the gall is transversely 

 seamed and irregular. It lies in a one-sided position upon the leaf. Yen- 

 trally the galls appear as white, hairy projections following the veins. The 

 opening runs the full length of the gall and is lined with white, hairy tissue. 

 The mites are exceedingly numerous, more occurring to a gall than of any 

 other species. Iney can easily be detected with a hand lens and are brown 

 in color. The interior of the gall is lined with soft tissue. Occurs on White 

 Ash {Fraxinus Americana). Not common. 



Eriophyes sp. This gall is a pouch-like growth on the upper side of 

 the leaf. It is distinguished from E . serotitiae by the fact that it has not 

 the funnel-like opening of that gall. It is green or reddish, about .5-. 7 

 cm. in length and 3 m.m. in diameter at its widest part. Near the leaf it 

 is constricted to about 2 m.m. in diameter. The interior of the gall is lined 

 with small granules and among these the gall mites feed. The gall opens 

 on the under side by a minute aperture about 1 m.m. in diameter lined with 

 fine white hairs. Occurs on Chokecherry (Prunus virginiana). Common. 



Eriophyes sp. Only one specimen of this gall was found. It is of the 

 same type as the gall on Chokecherry, but rather longer and narrower. It 

 is green in color and the inside is lined with rough juicy tissue. Only two 

 mites were found in the gall, near the opening. Occurs on Wild Plum 

 {Prunus Americana). Not common. 



Eriophyes querci. This is an irregular dimple upon the blade of the 

 leaf. It is of the same color as the leaf when young, but turns yellowish 

 red with age. From beneath it appears as an irregular concavity, lined 

 witli a tangled mass of white vegetable hairs. Among these abnormal hairs 

 are the mites, which feed upon the tissue and produce the gall. The gall 

 is 3 to 5 m.m. in diameter. Occurs on Bur Oak (Quercus macrocarpa). Com- 

 mon. 



Eriophyes serotinae. This gall is pouch-like. It occurs upon the upper 

 side of the leaf with a deep funnel-like opening beneath. The gall is about 

 .5-. 6 cm. in length and consists of a pouch-like hollow growth on the upper 

 side of the leaf constricted about half way to the leaf. The interior of the 

 gall, which is green or red and green, is covered with minute granulations, 

 which seem to be the food of the mites producing the gall. The distinguishing 

 character of the gall is the deep funnel-like opening beneath lined with hair 

 through which the mites pass in and out. Occurs on Black Cherry (Primus 

 serotino?). Common. 



Eriojjhyes sp. The gall made by this species of Eriophyes consists of 

 a small round swelling which protrudes very slightly on both sides of the 

 leaf. This is about .5-1 m.m. in diameter, green in color in spring, and 

 turning brown in summer and autumn. The galls are very numerous where 

 they occur, and as many as 100 are sometimes found on a single leaf. The 

 gall contains numerous mites, which feed in the irregular cavities in the 

 gall. Occurs on the spotted Hawthorn (Crataegus punctata). Not common. 



Eriophyes sp. Red patches are found upon the upper sides of the leaves 

 of Maples, resembling hoar-frost. Under the microscope, it is seen to con- 

 sist of minute pink balls, joined to the leaf by a constricted neck and oc- 

 curring in such numbers as to appear like red frost. Occurs on Hard Maple 

 (Acer saccharuTn). Common. 



