264 MAINE AGRICUIvTURAL EXPERIMENT STATION. I9I3. 



1893. Schlzoneiira lanuginosa, Rey, Exchange, p. 62. 



1900. Schizonenra lanuginosa, Del Guercio, Prosp. dell' afidofauna 



italica, Nuov. relaz. Ser. I, 2, p. 104. 

 1909. Schizonenra lanuginosa, Tullgren, Aphid. Stud. Uppsala, p. 170, 



Fig. 83. 

 1909 (1910) Schizonenra lanuginosa, Henrich, Die Blattlause der Umge- 



bung von Hermannstadt. 



Elm Rosette or L^ae Cluster Aphid. 

 Schisoneura lanigera {americana in part of authors). 



This aphid and the next succeeding are treated in Bulletin 

 217. I do not know whether the two are distinct, but from the 

 appearance and the behavior of the summer generations of both 

 on Pyrus and the antennal characters of the fall migrants do 

 not feel that there is any basis of separating them except as to 

 the nature of their elm habitat. 



The antenna of different generations of the rosette aphid, 

 (Figs. 123 to 128) together with some details as to wax glands 

 (Fig. 143 D. J. K.) are given for comparison with the other 

 elm aphids. 



This migrates normalty to Pyrus in ]\Iaine the spring 

 migrants from the elm leaves settling on the under side of the 

 leaves of mountain ash and apple, and their immediate progeny 

 creeping to stems of water shoots or tender places in the bark 

 before feeding. Such normal out of door colonies which were 

 watched carefully during their origin are shown in Fig. 78 in 

 Bulletin 217 of this Station. I have also reared the progeny 

 of the spring migrants on mountain ash in confinement, such a 

 colony being shown in Fig. 69 in Bulletin 217. 



It is abundant in both ]\Iaine and Colorado and doubtless all 

 the wav between. 



Figs. 123 and 124. Antennae of stem mother from rosette. 

 The antenna of this form is normally 5-jointed with a trans- 



