136 



NEW YORK STATE MUSEUM 



Irregularly oval, frequently fissured twig gall, length 3 to 4 cm, diameter 2.5 cm. 

 Felt and Joutel '04, p. 62 



Coleop. Thorn limb borer, S a p e r da f a y i Bland. 



Fig. 137. C e c i d o m y i a sp. on Crataegus, 32727. 

 (Original) 



Irregular twig swelling, resembling black knot of plum but with bright red 

 spores, length 1-2 cm, on C. o x y c a n t h a. 



Fungus. Cedar rust, Gymnosporangium globosum 



Fig. 138. C e c i d o m y i a sp. 

 on Crataegus, ai840. (Original) 



Fig. 139. Thorn vein gall, L o b o p t - 

 eromyia venae Felt, typical and 

 confluent forms. (Original) 



Cockscomb leaf gall, green and red, length i cm. Felt '07a, p. 160 



Itonid. Thorn cockscomb gall, Hormomyia crataegifolia 



Felt 



