38o The Ohio Naturalist. [Vol. XV, No. 2, 



Fig. 13. Hicoria ovata affected by an unknown gall-gnat. 



Leaf-gall on under surface, having the forni of a stout inverted 

 cone, attached by its apex, and with the free base surrounded by a 

 conspicuous fringe. 3-4 mm. high, 4-5 mm. in diameter. Green 

 to light yellow-green. Huron, July 25. Quite rare, and, I believe, 

 hitherto unreported. 



Fig. 14. Hicoria ovata affected by an undetermined gall- 

 gnat, doubtless the same figured by Miss Stebbins as Cecidomyia 

 caryaecola, Bull. 2, Springfield Mus. :13, 70. 



Leaf-gall, conical, on underside, with a sharply pointed tip, 

 which is elongated and curved as a rule. The broad base, as 

 gall matiu"es, developes a thin wide flange parallel and close to 

 plane of leaf. 4x5 mm. Common at Huron in late July. 



Fig. 15. Hicoria ovata affected by the gall-gnat Caryomyia 

 persicoides O. S. 



Cecidomvia persicoides Osten Sacken, Mon. Dipt. N. Am. pt. 1:193. 

 Felt, Joum. Sc. Ent. IV:456. 



Globular leaf-gall, on lower surface, along mid-vein, and 

 heavily covered with silken down, "like that of a peach and 

 looking like a very diminutive fruit of this kind. " (Beutenmueller). 

 2-4 mm. diameter. Light brown. Huron, late July. Common, 



Fig. 16. Hicoria ovata affected by the gall-gnat Caryomia 

 holotricha O. S. 



Cecidomyia holotricha Osten Sacken, Mon. Dipt. N. Am. pt. 1:193. 

 Felt, Journ. Ec. Ent. IV:456. 



Leaf -gall, on underside, sub-globular, papillate on flattened 

 free end, and finely pubescent over all. Single-chambered. About 

 4 mm. diameter. Yellow-green to red-brown. 



Fig. 17. Hicoria glabra affected by the gall-gnat Caryomyia 

 caryaecola O. S. 



Cecidomvia Caryaecola Osten Sacken, Mon. Dipt. N. Am. pt. 1:192. 

 Felt, Journ. Ec. Ent. IV:456. 



Leaf -gall, smooth, conical, attached to under surface of leaf 

 by rounded base, and lying close to veins. "Onion-shaped" — 

 Beutm.; "elongate onion-shaped," — Ost. Sack. 5x3 mm. Thin- 

 shelled, glaucous green, becoming brown and brittle in August. 

 Huron, late July. Common. 



Fig. IS. Hicoria glabra affected by the gall-gnat Caryomia 

 inanis Felt. 



Felt, Journ. Ec. Ent. IV:456. 



Leaf-gall, on upper surface, globular flattened with tenninal 

 nipple, and false chamber at free end. Thin-shelled, green, 

 rapidly discoloring. 4x3 mm. Huron, late July. Common. 



