ZOOLOGY: E. P. FELT 
349 
flower inflorescences. This peculiar type of pistillate inflorescence 
seems definitely confioied to the class of plants combining the tunicate 
and ramosa characters. 
The cauliflower character, which in itself would seem more nearly 
related to ramosa than to tunicate, is somewhat more definitely asso- 
ciated with the ramosa than with the tunicate character of the tassels. 
There were 22 plants with pure cauHflower ears. Twenty of these had 
tassels in which both tunicate and ramosa characters were obvious. 
The other two were classed as having ramosa tassels. Of the 13 plants 
with partial cauliflower ears 1 1 had ramosa tassels in which no tunicate 
characters were observed, and two showed evidence of both tunicate 
and ramosa in their tassels. 
If the second-generation plants are examined for each of the parental 
t)^es separately, there is seen to have been a simple 1 to 3 segregation 
in both instances. One-fourth of the total number of plants are ramosa 
and three-fourths non-ramosa (observed 79 to 247, expected 81.5 to 
244.5). One-fourth are non-tunicate and three-fourths tunicate (ob- 
served 80 to 246, expected 81.5 to 244.5). The distinction between 
half- and full-tunicate could not be made when these characters were 
combined with the ramosa character. The various combinations of 
parental characters, occurring as they do in the normal di-hybrid 
ratios, show that the tunicate and ramosa characters are not genetically 
correlated. 
The extended publication will appear in the Journal of Agricultural 
Research. 
^ Gemert, W. B., A new subspecies of zea mays L., Amer. Nat., Lancaster, Pa., 1912, 
46 (616-622). 
2 Blaringhem, Louis, Mutation el traumatismes, Paris, 1907, (121-122). 
DISTRIBUTION OF GALL MIDGES 
By E. P. Felt 
NEW YORK STATE MUSEUM. ALBANY. NEW YORK 
Communicated by J. M. Clarke. March 12. 1917 
The intimate relation existing between many species of these tiny, 
fragile flies and their food plants and the relatively limited migratory 
ability of either adults (owing to their weak powers of flight), or the 
larvae (due to their apodous or nearly apodous condition), led to a 
study of the distribution of these highly variable forms. The immensity 
of the complex may be appreciated by remembering that approximately 
three hundred genera and probably nearly three thousand species are 
known — the largest about 6 mm. in length and the smallest less than 
0.5 mm. long. Some live in decaying or dead organic matter, others 
