124 NEW YORK STATE MUSEUM 



Globular, subsessile, small leaf gall with a small impression at the top, not 

 pubescent. Pack. '90, p. 621 



Hemip. Pachypsylla globulus Ril. 

 Top-shaped, monothalamous, moderately thick leaf gall, the surface sparsely 

 clothed with whitish, appressed pubescence, the greatest diameter 3 to 4 mm. 

 Felt 'i6f, p. 190 



Itonid. Phytophaga wellsi Felt 

 Rosette-shaped, ribbed leaf gall resembling the seed capsule of Hibiscus, on 

 under surface of leaf, diameter 2 to 3 mm. Pack. '90, p. 614 



Itonid. Cecidomyia capsularis Patt. 

 Reniform, large, petiole gall involving the base of the leaf and with an opening, 

 polythalamous. Pack. '90, p. 617 



Hemip. Hackberry petiole gall, Pachypsylla venusta O. S. 

 Mammiform, very large leaf gall without a depression or rim on the top, usually 

 not pubescent, sometimes with a slight down at the base, diameter 4.5 mm. 

 PI. 14, fig. 2. Pack. '90, p. 619 



Hemip. Hackberry nipple gall, Pachypsylla mamma Ril. 

 Elevated, mammiform, with a long nipple-like protuberance, diameter 6 mm, 

 on under surface of leaf of C. reticulata. Cockerell, '10, p. 180 



Hemip. Pachypsylla rohweri Ckll. 



Subglobular, sessile, smaller leaf gall with long hairs and with a smooth, 



shining impression on the upper surface, diameter 3 mm. Pack. '90, p. 620 



Hemip. Pachypsylla pubescens Ril. 



Leaf gall resembling that of Pachypsylla pubescens but with no 



cup-shaped depression on the upper surface of the leaf, diameter 3.5 to 4 mm. 



Pack. '90, p. 613 



Itonid. Cecidomyia pubescens Patt. 



Circular, depressed leaf gall on the upper surface, the outer rim depressed, the 



central part slightly raised and with a median spine; wartlike on the under 



surface, much flattened and with a depression in the middle; height 2 mm, 



diameter 5 mm. Pack. '90, p. 619 



Hemip. Hackberry button gall, Pachypsylla umbilicus Ril. 

 Star-shaped or flower-shaped leaf gall and not forming a depression on the under 

 side, on the upper surface blisterlike, height 1.25 mm, diameter 5 mm. Pack. 

 '90, p. 618 



Hemip. Hackberry star gall, Pachypsylla asteriscus Ril. 

 Blisterlike, yellowish, monothalamous gall occurring on both sides of the leaf 

 and hardly raised above the surface. Pack. '90, p. 618 



Hemip. Hackberry blister gall, Pachypsylla vesiculum Ril. 

 Globose, not pubescent, sessile leaf gall, wider than high, much flattened on 

 the top and usually with two concentric, elevated rims and a central nipple. 

 Pack. '90, p. 621 



Hemip. Hackberry melon gall, Pachypsylla cucurbita Ril. 

 Conical, flask-shaped or subglobular, slightly ribbed, greenish leaf or tender 

 twig gall arising from a circular, truncate base, diameter 3.4 mm. Fig. 118. 

 Felt 'o8e, p. 371 



Itonid. Hackljerry flask gall, Phytophaga celtiphyllia Felt 



(o V i f o r m i s Patt.) 

 Subconical leaf gall, clustered^on the under surface, length 3 to 5 mm. Beutm. 

 '07c, p. 388 



Itonid. Cecidomyia unguicula Beutm. 



