2o6 DAVENPORT ACADEMY /DF SCIENCES. 



the absence of the winged or migratory generation, in which 

 respect it agrees with'P/i. c. -semen Walsh and PA. caryee-venee 

 Fitch. That Ph. deplanata is distinct from this last is made 

 patent by a comparison of the galls and stem-mother ; while it 

 •would also seem to be distinct from Ph. c. -semen, its western 

 representative. The galls of Ph. c. -semen are the smallest known, 

 measuring not more than 0.6-2™™- horizontally, being more or 

 less subglobular and provided with a round orifice, surrounded 

 by a fringe of 5-8 or more, rather broad bracts; whereas the galls 

 of this species have a transverse diameter of 1-5™™', are but 

 slightly convex above and more prominent beneath ; the orifice 

 is oval and without any bracts, but closely fringed with fine hairs. 

 Its walls are rather thin and flexible, while those of Ph. c. -semen 

 are thick and hard. In how far the insects of these two galls 

 differ is not at present known, but there is little doubt that 

 future more careful study of Walsh's species will reveal sufiicient 

 differences. 



The leaves of some of the smaller trees are often literally 

 covered with the galls of deplanata which then produce a sickly, 

 yellowish and crumpled appearance thereof. By the end of June 

 the galls are deserted, brown and dry, or else have completely 

 decayed, leaving innumerable holes in the affected leaves, 

 seriously affecting the health of the tree. When but a few days 

 old (first week in May) these galls resemble minute yellow 

 specks. 



The transverse diameter of the mature galls varies from 1-5™"!-; 

 height about i"'™- ; walls rather thin above and beneath and semi- 

 transparent. Upper surface projecting but little above the plane 

 of the leaf, convex, usually with a shallow fovea ; frequently not 

 central and occasionally with a sUght central elevation. Under 

 side more strongly convex, sometimes almost conical, the nipple 

 usually more or less flattened and generally leaning to one side, as 

 if pressed down when young; with the orifice usually oval, though 

 sometimes more or less rounded, and which before maturity is 

 perfectly closed and densely fringed with short pale hairs. Color 

 above either reddish with the depression yellowish, or almost 

 entirely greenish -yellow ; below purplish or dull greenish-yellow. 

 Many of the galls are conjoint, i. e., contain from 2-6 or more 



