380 
The Ohio Naturalist, 
[Vol. XV, No. 2, 
Fig. 13. Hicoria ovata affected by an unknown gall-gnat. 
Leaf-gall on under surface, having the form 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 matures, 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. 
Cecidomyia 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. 
Cecidomyia 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”— 
Beutrn.; “elongate onion-shaped,”—Ost. Sack. 5x3 mm. Thin- 
shelled, glaucous green, becoming brown and brittle in August. 
Huron, late July. Common. 
Fig. 18. Hicoria glabra affected by the gall-gnat Caryomia 
inanis Felt. 
Felt, Journ. Ec. Ent. IV:456. 
Leaf-gall, on upper surface, globular flattened with terminal 
nipple, and false chamber at free end. Thin-shelled, green, 
rapidly discoloring. 4x3 mm. Huron, late July. Common. 
