Dec, 1914.] Insect Galls of Cedar Point 385 



Fig. 40. Rosa sp. affected by the gall- wasp Rhodites nebu- 



losus Bassett. 



Lvtorhodites nebulosiis Kieffer. 



Bassett, Trans. Am. Ent. Soc. XVIII :63. 



Beutenmiiller, Bull. Am. Mus. XXIII:644. 



Leaf gall on under side, globular, light green to golden brown, 

 and covered with short spines. Diameter 5-S mm. Castalia, 

 July. Rather scarce. 



Fig. 41. Rubus nigrobaccus affected by the gall-wasp 

 Diastrophus nebulosus O. S. 



Osten Sacken, Proc. Ent. Soc. Phil. 11:36. 

 Stebbins, Bull. 2, Springfield Mus. 36. 



"Cane gall," being an irregular sweUing of varying length 

 (5-S cm.) and showing several longitudinal ridges, each forming 

 the abode of an individual larva. Occasional at Castalia. 



Fig. 42. Prunus serotina affected by the mite Eriophyes 

 serotinae Beutenm. 



Acarus serotinae Beutenmiiller, Bull. Am. Mus. IV:278. 

 Stebbins, Bull. 2, Springfield Mus. 40. 



Leaf gall, usually on upper surface, showing as a small pouch 

 with long, slender neck, opening below. 5-10 mm. long, 1-3 mm. 

 wide, leaf-green to rose. Chalcid inquilines are frequently 

 present. 



Fig. 43. Prunus virginiana aft'ected by a mite, Eriophyes sp. 



The gall is very like the preceding, undergoing a simultaneous 

 cycle, but is very much smaller, 1-2 mm. in length. Either 

 the well-known chemical differences of the two kinds of leaves 

 cause them to respond differently to the attacks of the same 

 species of mite, or what is more probable, two species or varieties 

 of mites are indicated. 



Fig. 44. Prunus virginiana affected by the gall-gnat Con- 

 trinia virginiana Felt. 



Cecidomyia virginiana Felt. 



Flower of fruit gall, evident as an abnormal swelling of the green 

 fruit. On June 29, when normal fruits were 4-5 mm. diameter, 

 galled specimens were 7-10 mm. and of a sickly yellow-green 

 color. Quite common. 



Fig. 45. Gleditschia triacanthos affected by the gall-gnat 



Dasyneura gleditschiae O. S. 



Cecidomyia gleditschiae Osten Sacken, Proc. Ent. Soc. Phil. VI:219. 

 Felt, Journ. Ec. Ent. IV:461. 



Pod-like gall, caused by the closure and subsequent dis- 

 tension of leaflets. Of varying size and extent within each 

 leaflet. Frequently showing inqttiline mites and aphids. Common. 



