22 THE CANADIAN ENTOMOLOGIST. 



small. Mr. B. D. Walsh, 1867, Proc. Ent. Soc. Phil., T. vi., p. 285-287, 

 enumerates 20 species from Illinois, occurring on 14 different genera of 

 woody plants. On Ulmus, 3 species ; Populus, i ; Carya, i ; Sahx, 2 

 (and probably several others) ; Quercus, many Acarideous semi-galls or 

 mere woolly indented deformations of the leaf; Fraxinus, 2 ; Betula, i ; 

 Juglans, 2 ; Crataegus, i ; Prunus, i ; Cerasus, i ; Tilia, i ; Cephalan- 

 thus, I ; Acer, 2 ; Negundo, i. Only the two species on Salix are named 

 and described. 



Mr. H. Shinier, 1869, Trans. Amer. Ent. Soc, T. ii., p. 319, described 

 from Acer dasycarpiim a gall containing Vasates quadripedes, nov. gen. 

 and sp. Mr. J. A. Ryder, 1879, Amer. Naturalist, T. xiii., p. 704, describes 

 an Erineum on Acer. 



Mr. W. H. Ashmead, 1879, Can. Ent., T. xi., p. 159, describes Thy- 

 phlodronms oiliivorus^ of oranges, as the cause of the rust of the fruit. 



Mr. T. J. Burrill, 1880, Gardener's Monthly, January, and Am. Ent., 

 T. iii., p. 26, describes Typhlodromus pyri, believed to be identical with 

 the same species from Europe, in the pear-leaf blister. 



There are in all known 24 species from the U.S., and 6 of them are 

 described. 



The following list of the species in the collection is arranged alpha- 

 betically after the plants, the species from Europe and those from America 

 separately. The scientific description and the naming of the species will 

 be the work of a monographer, and are not given here, because I believe 

 this collection too small for such a purpose, the more as the mites are not 

 represented. 



/. From Ezirope. All except four by Mr. Brischke are from Dr. Fr. 

 Thomas, to whom belong the notes given with each species. The often 

 quoted paper on Phytoptus was first published in the " Programm der 

 Realschule," etc., zu Ohrdruf, Gotha, 1869, 4th, pg. 29, pi. i. Reprint, 

 with additions to the paper, in Zeitschrift, f d. ges. Naturniss., by Giebel 

 Halle, 1869, T. 33, p. 313-366. Both are quoted as Progr., and as Add. 

 PI. means Pleurocecidia Thoni., Acr. means Acrocecidia Tlioni. 



1. Acer campestre\-,. PI. Ohrdruf, Saxony ; fall, 1879. Gall on leaves, 



Cephaloiieon myriadum Bremi. Progr. p. 9, No. 9; Add. p. 335. 



2. Acer cainpestre L. PI. Ohrdruf, fall, 1879. Cephaloiieon solitarium 



Bremi. Verhandl. d. St. Gallischen natur. GeselL, 1870-1871, p. 3. 



Corrected by Dr. Thomas in oleivorus. 



