Insect Galls. 33 



Ulmus fulva. 



Pemphigus fusus Walsh and Riley. Elm spindle-gall. Fig. 60. 



Pemphigus ulmi-fusus Walsh and Riley, Amer. ent., 1869, v. l. p. 109. 



Cook, <>lii<> nat., 1902, v. ->, p. 265, fig. II; L903, \ . 3, p. 425, fig. 49; 29th ann 

 rept. Dept. geol. and nat. its. [ndiana E. 1904, 1905, p. 849. 

 A spindle-shaped, hollow gall on the upper side of the leaf with the 

 opening below. Varying in size, about 15 mm. long. Not common. On 

 slippery elm, Ulmus fulva. Summer. 



Celtis occidentalis. 

 Pachypsylla cucurbita Riley. Haekberry melon-gall. 



PachypsyUa celtidis-cucurbita Riley, 5th rept. U. S. ent. eomm., 1890, p. 621-622. 



Beutenmiil ler, Bull. Amer .-mus. nat. hist., 1 s'.»^, \ . i. p. 276, pi. 1»;, 

 fig. -'. 



An oval gall with truncated apex and concave above with a .small 

 nipple. Usually on under side of the leaf. About 2 mm. in diameter at 

 base, 4 mm. in height. On the upper side of the leaf there is a cup-shaped 

 depression. Color yellow green. On the haekberry, Celtis occidentalis. 



Pachypsylla mamma Riley. 



PachypsyUa celtidis-mamma Riley, Johnson's universal cyclop., 1876, p. 425; Proc. Biol, soc, 



Wash., 1884, v. •_', p. 73-75: 5th rept. r. s. cut. comm., 1890, 



p. 619-620, 1iii. 202-203. 

 Beutenmiiller, Bull. Amer. mus. nat. hist., 1892, v. 4, i>. •>l-~>; Ins. 



Kails vicin. N. Y., 1904, p. 35-36, fig. 

 Cook, Ohio nat.. 1903, v. 3, p. 426, fig.59-60; 29th ann. rept. Dept. 



geol. and nat. res. Indiana 1. 1904, 1905, p. 845, fig. .*!7. 

 Jarvis, 37th aim. rept. Ent. soc. Ontario, 1906, p. «'>•"). 



A nearly cylindrical gall on the under side of the leaf, with the apex 

 rounded. A cup-shaped depression on the upper side shows presence of 

 the gall. Varying considerably in size, about 7 mm. high, 5 mm. in 

 diameter. Color yellow green. Very abundant on haekberry, Celtis 

 occidentalis. 

 Pachypsylla vesiculum Riley. Haekberry blister-gall. 



PachypsyUa csttidis-vesiculum Riley, 5th rept. V . s. cut. comm., 1890, p. <',is. 



Beutenmiiller, Bull. Amer mus. nat. hist.. ls;t-2. v. 4. p. 275; Ins- 



Kails vicin. N. V., 1904, p. 35, fig. 

 Jarvis, 37th ann. rept. Ent. soc. < totario, 1906, p, 65. 



A circular, blister-like gall. Slightly rounded above, beneath convex 

 with a small central projection. Green. About 4-6 mm. in diameter. 

 Numerous on the leaves of haekberry, Celtis occidentalis. 



MAGNOLIACBAE. 

 Liriodendron tulipifera. 

 Contarinia liriodendri Osten Sacken. Tulip-tree spot-gall. 



Cecidomyia liriodendri. Osten Sacken, in Loew's Mon. dipt. X. A. 1862, pt. -2. p. 202. 

 Hagen, Can. ent.. 1886, v. IS. p. 159. 



Beutenmiiller, Bull. Amer. mus. nat. hist.. L892, v. 4, p. 265; Ins. galls 

 \ icin. X. V., 1904, p. 25, fig. 

 Contarinia liriodendri Felt, -23d rept. ins X. V. f. 1907, 1908, p. 383, 393. 



Circular brown spots with surrounding circle of yellow or light green, 

 .showing on both sides of the leaf, 1-3 mm. in diameter. Not uncommon 

 on leaf of tulip tree, Liriodendron tulipifera. 



