Dec., 1914.] 
Insect Galls of Cedar Point. 
38i 
Fig. 19. Hicoria ovata affected by the gall-gnat Caryomyia 
tubicola O. S. 
Cecidomyia tubicola Osten Sacken, Mon. Dipt. N. Am. pt. 1:192. 
Felt, Joum. Ec. Ent. IV:456. 
Leaf-gall, on underside. Cylindrical, set in a socket from 
which it readily detaches. 1.5x6 mm. Light green to red. 
Fairly common. Huron, late July. 
Fig. 20. Quercus velutina affected by the gall-gnat Ceci¬ 
domyia oruca Walsh (?) in company with an undetermined mite. 
Felt, Journ. Ec. Ent. IV:467. 
Leaf-gall, evident as a fold snug alongside veins on under 
surface. Pouches isolated at times, but usually confluent and 
present in great numbers. Brownish opening on upper surface, 
resembling swollen lips of a knife-cut. In southern Ohio I have 
seen every leaf on a good-sized tree dying from this gall, as early 
as June. (The figure shows what are doubtless galls of Ceci¬ 
domyia foliora Russ. & Hook., evident as infoldings of the edge.) 
Fig. 21. Quercus imbricaria affected by the gall-wasp 
Andricus futilis O. S. 
Cynips futilis Osten Sacken, Proc. Ent. Soc. Phil. 1:63. 
Andricus ( Callirhytis ) futilis Bassett. 
Beutenmueller, Bull. Am. Mus. IV, No. 1:254. 
Leaf-gall, woody, flattened spherical, resembling a wart on the 
upper surface and showing as a slight, nippled projection on 
lower surface. Usually present in great numbers, on both Q. 
imbricaria and Q. velutina. 2-4 mm. diameter, often confluent. 
Dark brown. Quite common. July-August. 
Fig. 22. Quercus imbricaria affected by the gall-wasp 
Andricus singularis Bassett. 
Cynips quercus-singularis Bassett, Proc. Ent. Soc. Phil. 11:326. 
Cynips singularis O. S. 
Cook, Appendix Ins. Galls. Ind., p. 3. 
Leaf-gall, globular, about 18 mm. diameter and showing 
greater part of its bulk on under surface of leaf. Larval chamber, 
2-3 mm. diameter, is supported in center by slender branching 
filaments, radiating in all directions. Light brown and papery 
when old. June 25. Fairly common. 
Fig. 23. Quercus alba affected by the gall-wasp Andricus 
clavula Bassett. 
Cynips arbor Fitch. 
Cynips clavula Bassett, Proc. Ent. Soc. Phil. 111:686. 
Andricus ( Callirhytis ) clavula Bassett. 
Beutenmiiller, Bull. Am. Mus. IV, No. 1:255. 
Twig-gall, being a club-shaped swelling of the extreme tip. 
1.5 x 2-3 cm. Green, single-chambered, becoming woody and 
dark after emergence of insect in midsummer. Surface often 
corrugated and covered with cork spots. Cedar Point and 
Huron. Common. 
