Fifth report of the United States Entomological Commission, being a revised and enlarged edition of Bulletin no7, on insects injurious to forest and shade trees . .:^ Fig. 202.—GM of Pachypsylla : a, leaf withgalls from underside—natural size; b, section of gallshowing cup-lilie depression, and insect in cavity; c,pupa—enlarged. (After Riley.) The walls of the gall are hard and woody, at the bottom ™, at the roof ^ in thickness. The cell (Fig. 202, h) is large, andin cross-section much morecrescent-shaped than in thepreceding species. The ma-ture pupa issues through a
Fifth report of the United States Entomological Commission, being a revised and enlarged edition of Bulletin no7, on insects injurious to forest and shade trees . .:^ Fig. 202.—GM of Pachypsylla : a, leaf withgalls from underside—natural size; b, section of gallshowing cup-lilie depression, and insect in cavity; c,pupa—enlarged. (After Riley.) The walls of the gall are hard and woody, at the bottom ™, at the roof ^ in thickness. The cell (Fig. 202, h) is large, andin cross-section much morecrescent-shaped than in thepreceding species. The ma-ture pupa issues through anoval slit sawed through theroof, always near the sidewhere the wall is less thick. 42. P. ceUidis-puhescens —This gall on the upperside of the leaf is representedbj^ a small circular cup-shapedimpression, surrounded by a rather wide, thickened, and elevatedmargin, and furnished at the bottom with a small, usually star-shaped, median nipple. The bottom and sides of the impression are. Fig. 203.—Pachypsylla : adult—enlarged.(Original.) HACKBERRY PSYLLIDS. - 621 smooth and shining, and occasionally beset with a few scattered hairs;the elevated margin is coarsely rugose-plicate, and usually also diameter of gall, including elevated rim, about 3; withoutthe latter, nearly 2^. On the under side of leaf it is usually semi-globular, entirely sessile, sometimes more flattened, rarely more globu-lar and then less sessile. Surface more or less rugose, not shining,and covered with long but not densely placed white woolly is sometimes a small apical nipple surrounded by a slight de-pression. Average diameter, 3. Color pale greenish-yellow. Thewalls are very thin, but much thicker than the leaf itself; the roof isstraight and the cell comparatively large and crescent-shaped in a cross-cut. Mode of issuing of mature pupa as in the preceding. 43. P. celtidis-glohulus n. sp.—A gall on the upper side of the leafrepresented by a very circu
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