American Insect Galls: Thompson 65 



263. Cecidomyia. Blister gall. Thorn. Mass. Jul.y. Above slight elevation color of loaf 



surrounded by dull, purplish areola; below paler than leaf and somewhat wrinkled. 

 Circular gall 5-10 mm. diameter, plate 20, 263. 

 Lasioptera excarata Felt. 



264. Cecidomyia. AVhite thorn. On leaf =233. Fleshy base emitting a slender elevation 



covered with filamentous branches. 

 333. Cecidomyia. Thorn leaf. Mass. Julj'. Lipped, elongate orifice along a vein on ujjper 

 side; smooth, deep, leathery walled pocket beneath. Probably cecidomyious. 

 Kno\vn, not reared, unnamed. 



THOROUGH WORT {Eupatorium) 



40. Choristoneura perfoliata (n. sp.). cf 9 . Thoroughwort — Boneset. Mass. Oct. Ovoid 

 swelling of stem, plate 21, 40. 



Neolasioptera perfoliata Felt. 



291. Cecidomyia. Cone gall. Eupatorium purpureum. Mass. Sept. Flower bud trans- 

 formed into a conical mass of linear scales. Small, orange, inquiline, cecidomyious 

 larva Mathin, plate 20, 291. 

 Dasyneura purpurea Felt. 



TULIP TREE {Liriodendron) 



105. Cecidomyia liriodendri. 0. S. '67, p. 202. Tulip tree. Mass. July. Mahogany brown 

 with darker center, plate 20, 105. 



Contarinia liriodendri O. S. . - 



TUPELO (Nyssa) 



330. Eriophyes. Nyssa sylvatica gall. Mass. July. Margin thickened and rolled inward 



giving a crinkled border which scallops the leaf, plate 20, 330. 



331. . Nyssa sylvatica. Pustular, pale yellow elevation above, 1 mm.; depression 



with elevation in center below. 



VIBURNUM 



239. Cecidomyia. Viburnum acerifolium. July. Small blisters equally elevated on each side 

 of leaf, often ringed by crimson line, plate 20, 239. 



Sacke7Wmyia {?) nburnifolia Felt. 



WILLOW (Salix) 



37. Cecidomyia triticoides. Walsh '64. Willow species. Mass. May-June. Remote re- 



semblance to head of wheat. End of liranch aborted making a dense tuft of small 

 leaves, plate 21, 37. 



Rhabdophaga triticoides Walsh. 



38. Phytoptus species. Willow, Mass. May. Elevated, irregular masses," single or compound; 



on upper side of leaf and more rarely below. Both )iositions on same leaf. Green 

 or red according to host willow, plate 19, 38. 

 42. Cecidomyia rigidae. Walsh '64, j). 591-598. Willow club gall. Mass. June. O. S. calls 

 this "Cccid. siliqiia." Egg evidently laid in terminal bud which is excavated by tjie 

 larva burrowing downward. Top ajipcars to lie always open, plate 21, 42. 



I'hj/ldiihihid rifiidii Walsh. 



