Jan., '10] 



ENTOMOLOGICAL NEWS. 



longest hairs does not exceed .i6mm. and seldom are they that 

 long, while the length of the similarly placed hairs on the 

 wing-ed specimens of aceris received from Dr. Del Guercio 

 were usually .30 or .31 mm. The difference in lengths of 

 hairs on the wingless forms is also noticeable, but much less 



Chait, aceris, Dorsal surface abdomen. 

 Antenna. 

 Last antennal segment. 



Chait. nfgitndinis, Dorsal surface abdomen. 

 Antenna 



Last antennal segment. 



so than in the winged forms. Another characteristic which 

 1 tind to be quite constant is the sensoria on antennal segment 

 III of the winged viviparous female. In aceris there are 25 

 irregularly placed sensoria on III, while in negundinis there 

 are but 7 or 8, which are more or less in a row. The rela- 



