FIELD BOOK OF INSECTS. 



Plate XCIX, Fig. i, shows galls of Colopha 

 ulmicola. Pemphigus ulmifusus makes soli- 

 tary, spindle-shaped galls on the upper surface of red elm 

 leaves. 



Plate XCIX shows Pacliypsylla cucur- 

 ac berry ^- fa , (p^ ^ on un d e r side of leaf, concave 



in the middle, with a small nipple; P. vesiculum (Fig. 5), 

 flat, blister-like, convex with a small nipple; P. mamma 

 (Fig. 6), nearly cylindrical, apex rounded bluntly; P. 

 gemma (Fig. 7), variable in shape and size, woody, numer- 

 ous cells; P. venusta (Fig. 8), on petioles, several compart- 

 ments. 



Plate XCIX: Hormaphis bamamelidis 

 Witch-hazel 2 ^ green i s h or re ddish, on upper side 



of leaf; Hamamelistes spinosus (Fig. 3), green or reddish 

 bud-galls. 



Plate XCIX: Cecidomyia tulipifera 

 Tulip-tree ^{g. 9); Thecodiplosis liriodendri (Fig. 10), 



brown spots with a yellow or greenish areola. 



Plate XCIX, Fig. n: Cecidomyia (?; 

 ple incorrectly classed in Sciara; probably not 



a Mycetophilid, according to Dr. Felt) ocellaris, light 

 yellow or green, usually with a red, central dot; it has 

 never been reared. Phyllocoptes acericola make slender, 

 spindle-shaped galls on the upper surface of sugar-maple 

 leaves; and P. quadripes, small, bladder- like galls on the 

 upper surface of soft-maple leaves. 



Plate XCIX, Fig. 12: Pemphigus rhais, 

 Sumac yellowish-green tinged with red, hollow, 



on under side of leaf. 



466 



