1913] 



Study in Antennal Variation. 



235 



35-12. (Figs 8 and 9). Elm leaf roll. St. Louis, Mo. 

 Received from Mr. J. T. Monell, June 14, 1912. 



43-12. (Fig. 2). Elm leaf roll. Orono. June 20. For 

 discussion see 113-12. 



(Fig 68). Elm rosette. Calais, Me. June 21, 1912. 



(Figs. 76-82). Elm rosette. Standish, Me. June 



The rosette was old and considerably dried and the 



were smaller than those from fresher and juicier 



45-12 



49-12 

 24, 1912. 

 migrants 

 rosettes. 



53-12 

 26, 1912. 



57-12 

 1912. 



58-12 

 1912. 



60-12. 



Orono. June 

 June 26, 



(Figs. 3 and 4). Elm leaf roll 



(Fig. 69). Elm rosette. Caribou, Me 



(Fig. 75). Elm rosette. Berlin, N. H. June 28, 



(Figs. 



roll and rosette. 



32-67). Migrants developed in elm leaf 

 Collected June 28- July 12, 1912, from the 

 ventral surface of leaves of Pyriis americana (Mountain Ash), 

 to which they had migrated. A fuller account of this collection 

 is given in Journal of Economic Entomology, Vol. 5, p. 397. 



61-12. (Figs. 70-73). Elm rosette. Oakland, Me. June 

 29, 1912. 



Elm rosette. Orono. June 21, 1912. 



(Fig. 1). Elm leaf roll. Houlton, Me. June, 



65-12. 

 68-12. 

 1912. 



111-12. 

 113-12. 



(Fig. 5). Elm leaf roll. Orono. July 20, 1912. 



(Figs. 6 and 7). Elm leaf roll. Orono. July 23, 

 1912. Purposely collected late for comparison with 43-12 

 (Fig. 2) which developed June 30 in the same rolls. The 

 difference in the actual size of the antennae and in the number 

 of annulations of the big, thrift^^ early ones from the juicy leaf 

 and the last individuals to develop in the drying roll would 

 seem suggestive of the physiological effect of the habitat on the 

 size of the individual and the character of the antennae. 

 165-12. Pyriis sitchensis Piper, bark. Orono. Sept. 



1912. 



175-12. 



176-12. 

 Louis, Mo. 



Apple bark. Orono, Me. Sept. 28, 1912. 

 (Fig.28). Crataegus (monogyna) Oxyocantha. 

 September 27, 1911. Mr. J. T. Monell. 



24, 



St. 



Note. By elm leaf "roll" is indicated a deformation of a single leaf. By 

 "rosette" is indicated a terminal cluster. (Figs. 442 and 462, Bulletin 203, Me. 

 Agr. Expt. Sta.). 



