Dec., 1907.] 
New North American Tabanidae. 
221 
of new segments per one old segment, we find that the power of 
regeneration in the A-mother pieces is greater than that in the 
B-mother pieces, 1.7 times, which is the ratio between 4.4 and 2.6. 
According to the same principle of calculation, the power to 
regenerate in the little worms, a, which are the asexually pro¬ 
duced offsprings of the A-mother pieces, will be 1.8 times greater 
than that in the little worms, b., which are the offspring of the 
B-mother pieces. 
Thus we find that tissue regenerated from a part of an animal’s 
body which possesses a high power of regeneration will also have 
a comparatively high power to regenerate, while tissue regenerat¬ 
ed from a part which has a lower capacity to regenerate will also 
have a low capacity, and furthermore, the ratio between the 
rates of posterior regeneration in the mother-pieces is very nearly 
like that between the rates of regeneration in their regenerated 
offspring. 
Such cases may be regarded as genuine hereditary phenomena, 
since a character, or the power to regenerate in this instance, is 
transmitted from one individual to another. It differs, however, 
from other cases of hereditary transmission, in the fact that the 
new generation is not produced from the fertilized egg by the 
process of embryological development, but from regenerated 
tissue. This led me to the conclusion that, “The propertv of 
regeneration passes over to the new tissue together with the 
protoplasmic material it is built of.” 
State University, Columbus, Ohio, November 26, 1907. 
DESCRIPTIONS OF NEW NORTH AMERICAN TABANIDAE. 
James S. Hine. 
Many of the species described in this paper come from the 
southern parts of North America where least collecting has been 
done. After having taken a trip to Guatemala I am satisfied 
that careful work in that country throughout the season will 
bring to light many unknown species. The collecting that has 
been done there has been the result of short trips to various lo¬ 
calities, usually by collectors who have been interested in making 
general collections, so it seems that we have not had the oppor¬ 
tunity to get a comprehensive notion of the fauna, at least this 
is true in reference to the Tabanidae. Among the permanent 
inhabitants of the country, the study of entomology has not ad¬ 
vanced to the stage where it is the practice to preserve specimens 
in collections, to any marked degree, for the use of students; at 
least in the museums that I visited only a few of the commoner 
Tabanids were to be seen. What is true of Gautemala is true, no 
doubt for other Central American states. It is to be hoped. 
