KKV TO AMF.RICAX INSF.CT GALLS 



121 



Thickened, K-een or reddish, erested. cockscomb-shaped ndges ansmg from 



lateral veins, length lo to 15 mm, height 8 mm. iMg. 1 14. Felt 06b, ,^ 86 



Aphid. Cockscomb elm gall, C o 1 o p h a u 1 m 1 c o 1 a h itch 



Spindle-shaped, hollow gall on the upper surface of the leaf, variable in size, 



length about IS mm, on slippery elm. Fig. 115. Felt 15c, p. 58 



Aphid. Slippery elm pouch gall. Pemphigus " ^ "^ '' ^ ^^^|^^^ 



Pemphigus 



Fig. 115. Slippery elm pouch gail, Pemphigu 

 u 1 mi f u s u s Walsh. (Author' • illustration) 



Fig. I If). Elm sack 

 gall. Tetraneura 

 ulmisacculi Patch. 

 (Author's illustration) 



Globose, subsessile, yellowish green, sometimes pmk-tinted leaf gall, diameter 

 5toi2mm,onU. mont.na. Fig. 116. ^^^^ ^Se- P- 57 



Aphid. Elm sac gall, T e t r a n e u r a u 1 m 1 s a c c u 1 1 Patch 

 Curled and twisted leaves containing numerous mealy-covered Aphids, on U. 



americana. Felt '06b, p. 177 .^i,. a,np Ril 



Aphid. Elm leal aphid, S c h 1 z o n e u r a a m e r 1 e a n a R 1 . 



Globose, green or yellowish grren, pocket galls, on U. americana, U. 



racemosa, U. fulva. Chadwick '08, p. I49 t, ,, p c; <=n 



Acarid. E r 1 o p h y e s sp. 



