Amehican Insect Galls: Thompson 25 



Gall on Silphium 



A. Cells in the pith; no gall — 



Aulax rufus Gill. '91, p. 195-196, pi. 9, fig. 4 (Anlistrophus) , cf 9 , lU. 



S. laciniatus (?), S. perfolialum, S. terebinthinaceiim, S. integrifolium) . 

 Antistrophus minor Gill. '91, p. 196, 9 , S. laciniatum, 111. 

 Aulax gillettei Kieff. 



B. Gall, abrupt swelling at tip of stalks— 



Aulax silphii Gill. '91, p. 192-194, pi. 9, fig. 1-2 {Antistrophus), d' 9 , S. integrifolium, S. perfolia- 

 ium. 111. Winters. May-June. 

 Avlax leavenworthii Bass. 



C. Gall on the receptacle of flower-head — 



Antistrophus laciniatus Gill. '91, p. 194-195, pi. 9, fig. 3, cf 9 , S. laciniatum, 111. 

 Aulax. 



Gall on Ambrosia 



Aulax ambrosiaecola Ash. '97, p. 134-135, cf 9 , A7nbrosia species. 'Mo. Cells in pith (?). 

 Aviacidea. 



Gall on Lygodesmia 



Antistrophus pisum Walsh '70, p. 73-74, fig. 47, d' 9 , L. juncea, Neb. Winters. Mid-May. 

 Gill. '89, L. juncea, Colo. 

 Pea-shaped on stem. 

 Aidax. 



ERICACE^ 

 Gall on Vaccinium (Gaylussacia) 



Solenozophoria vaccinii Ash. '87, p. 149, 9 , Huckleberry, Fla. Winters. Late Feb. 0. S. 

 "Stettin," p. 416, Gaylussacia dumosa, D. C. 

 Low and high-bush blueberry, Mass. Winters. Reuiform; on twigs, plate 3, 34. 



ASCLEPIADALES 



Gai/L on Stephanotis 



Asclepiadiphila stephanotis Ash. '97c., p. 263, cT 9 , Stephanotis species. Ore., Mo. 

 Monothalamous; pea-shaped on stem. 

 A^dax pisum 



LABIAT.E 



Gall on Nepeta 



Liposthenus glechomse Linn. 10 cd. Syst. Nat. {Cijnips), N. hederacea, Hartig. 1841 (.4M7a.r); 

 9 =Diastrophus similis Bass. '81, p. 95-96, 9 . A^. glechoma, N. Y. (See Mayr 

 1902.) 

 Globular, axillary. Introduced. 

 Aulax 



