Insect Galls. 23 



Andricus ¥ gallaestriatae, n. s. Striate oak-gall. Fig. 34. 



A spindle-shaped gal] developed from a very small bud near the base 

 of last season's twig, projecting from the tip of the laid. Top lilnnt wit 1 1 

 inserted tip. Comparatively thick-walled, the one larval cell fi 1 1 i n u" the 

 space, with a mere suggestion of supporting fillers at either end. Stem 

 longer than remainder of the gall. (Jail about 2 cm. long, 2 nun. wide. 

 Green yellow with each of the 7-10 longitudinal ridges tinned with red. 

 more strongly on one side of the gall than on the other. On scarlet oak, 

 Quercus coccinea. September. 



This gall resembles Andricus callidoma G fraud and A. giraudi W'aclitl 

 of Europe in situation and general shape, but is smooth instead of hairy. 

 See C. Houard's Les zoocecidies des plantes d'Europe, 1908, p. 2o<> and 

 2 1 3 . 



Callirhytis fruticola Ashmead. Fig. 33. 



Callirhytis fruticola Riley .Ms., Ens. life, 1893, v. 5, p. 196; Murtfeldt, Ins. life L894, v. 6, p. *2-J. 

 Ashmead, I'roc. 1'. S. nat. urns., 1896, v. 19, p. 131. 



Small galls, several (7 or more) completely filling the shell of acorns. 

 So massed as to give irregular shapes. Walls pithy, inner wall firm, 

 rather thick, filled by white larva. Size varying with size of acorn. 

 Brown without, white within. On scarlet oak, Quercus coccinea. May 

 be quite common, but the acorns give no ex ernal indication of their 

 presence, so it is seldom noticed. 



Callirhytis palustris Osten Sacken. See p. 21-22. 



Callirhytis punctata Bassett. See p. 20. 



Callirhytis pusulatoides Bassett. 



Andricus {Callirhytis) pusulatoides Bassett, Trans. Amer. ent. soc., 1890, v. 17. p. 74. 



"Blister-like galls on the points of the acute lobes of the leaves of 

 Quercus coccinea, each tipped with the long hair-like point that terminates 

 each lobe. They are ovate-acuminate, and look as if a bubble of air had 

 separated the upper and under lamina of the leaf. They are about one- 

 third by one-fifth of an inch in diameter, sometime a little depressed verti- 

 cally. The walls are very thin, the color the same as the leaf. Each con- 

 tains a free, oblong-oval, thin-walled larval cell, whose length is fully 

 twice its diameter." 



Callirhytis saccularius Bassett. 



Callirhytis saccularius Bassett, Trans. Amer. ent. soc, 1890, v. 17, p. 70. 



An irregularly hemispherical gall projecting from the under side of the 

 leaf, showing above a brown circle in which is usually the opening through 

 which the adult emerges. Green becoming brown, surface with rather 

 long, scattered hairs. Monothalamous with thin walls, 3-4 mm. in diam- 

 eter, 2-3 mm. deep. On scarlet oak, Quercus coccinea, usually, sometimes 

 on black oak, Q. velutina. 



