Andricus formosue (Baas*). 510. Pig. 147. Fig-shaped, in cluster on twig in 
spring, dropping when mature in June. 
Oallirhytis excavata (Ashm.). 425. Figs.154,282. Lenticular polished cells 
bursting out thru bark, dropping when mature in Sept. 
Oallirhytis ventricosa (O.S.). 485. Figs.144-5. Conical, short_pubescent, 
sessile, single or small group, green when young in May, dropping later. 
Oells hidden under bark 
Oallirhytis medularis Weld. 447. Fig.166. Cells in pith of current year. 
Oallirhytis crypta (Ashm.). 418. Figs.162,501. Cells just under bark in the 
wood; if numerous the twig may be hypertrophied. 
Bassettia ceropteroides (Bass.). 578. Slight enlargement at base of the 
annual growth, containing a few cells. In July. Entered from lit. 
Leaf galls 
Detachable 
Amphibolips nubilipennis (Harris). 290. Fig.509* Like a green grape,almost 
translucent, succulent, up to 21 mm. in dia., on under side,May-June. 
Dryocosmus deciduus (Bout.). 594. Fig.2o5. Black Oak Wheat. Cluster of up 
to 4o bursting out of midrib in early Oct., dropping when mature. 
Oallirhytis piperoides (Bass.). 469. Fig.2()l. Cluster on upper or lower 
side of leaf, each spherioal, red, pubescent, 1- 4 ram. in dia. 
Oallirhytis furva Weld. 455* Fig.212. Small cluster of globular galls, 5-4 
mm. in dia., each covered with short, straight brown hairs, upper side. 
Dryocosmus rileyi (Ashm.). 401. Flg.257. Globular, brown,5 mm. in dia., 
single on main vein on under side, dropping when mature in fall. 
Dryoooamus albidus Weld. 592. Figs. 242,512. Depressed sphere, white, bare, 
fleshy, up to 5.4 mm. in dia., on under side of leaf in late fall. 
Zopheroteras hubbardi (Ashm.). 565. Fig.508. Ellipsoidal, pure white, 2.5 
by 1.85 by 1.7 mm.From this gall an adult det* as this sp. was reared. 
Oallirhytis lanata (Gill.). 445* Fig.2o6. Woolly midrib cluster on under 
side of leaf in fall, dropping before the leaves. 
Integral 
Oallirhytis tumifica (O.S.).485* Fig.255. Midrib swelling at base of leaf 
blade or on petiole, many-celled, green, in May-June. 
Oallirhytis modesta (O.S.). 450. Fig.265. Hard, confluent parenchyma 
thickenings projecting on both sides of the leaf. 
Oallirhytis favosa (Base.). 427. Iterenchyma thickening projecting on both 
sides of leaf, many-celled, inner structure in cross-section suggests 
a honeycomb, not succulent. Adults in late July-August. 
Andricus ostensackenii (0.8.)• 5^9* Small oak apple, 7-9 mm.,projecting 
on both sides of leaf, larval cell supported by fibers. 
Oallirhytis pigra (Bass.). 468. Fig.257* Fleshy, smooth midrib swelling 
on basal half of leaf in midsummer. 
Amphibolips coelebs (O.S.). 279* Fig.191. Spindle-shaped, 28 by 4.5 mm., 
green, the prolongation of a vein. 
Dryocosmus palustris (Ashm.). 400. Fig.181. Globular, 10-17 mm., with a 
free-rolling cell, appearing with the leaves in early spring. 
Dryocosmus notha (Ashm.). 599* Fig.182. Green, wall thin and translucent, 
with a free-rolling cell, the tip prolonged into a sharp point. 
Dryocosmus cinereae (Ashm.). 595« Fig.185* Hemispherical, thin-walled, 
with a free-rolling cell, sessile on under side of leaf. 
Amphibolips confluents (Harris). 280. Fig.174. Spongy Oak Apple. 
Ovipositing in buds, gall unknown. 
Oallirhytis perobscura Weld. 465* Taken ovipositing in buds in the D.C. 
area on Apr.18,20,1927; Apr.22,1950? Apr.25,1952; Apr.25,1947 and 
Apr.15,1925. 
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