Dec, 1907.] New North American Tabanidae. 221 



of jiew 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 httle worms, b., which are the offspring of the 

 B-mother pieces. 



Thus we find that tissue regenerated from a part of an animal's 

 bodv 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 property 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. 



Manv 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,. 



