OF WASHINGTON. 103 
fringe of yellow hair along the inner margin of the front tibia. 
Thus, Theodosia perakensis Moser has the cephalic horn simple, 
but the anterior tibia fimbriate, and T. rothschildi Janson has 
the cephalic horn bifid and the anterior tibia fimbriate. There 
are, again, no other differences to distinguish these forms, and 
it may be seriously questioned whether these four forms may 
be considered as distinct species. It may be added that 
dissections of all forms of Mount Kina-Balu Theodosias proved 
that the male parts are absolutely identical. Mr. Schwarz 
showed also the females, some 53 in number. Among these 
only one, or at most two, forms can be distinguished. 
Dr. Dyar stated that the Lepidoptera from Mount Kina-Balu 
in the Goss and Dodge collection make a very fine showing. 
He experienced great difficulty in getting names for all the 
species, however, since Whitehead's work on the results of 
the explorations in Mount Kina-Balu lists only the new or 
rare species that were taken and is, therefore, of no assistance 
in determining the others. 
Mr. Schwarz said that it is a common fault with writers 
of works on exploration that complete lists of the species 
collected are not given, only those species either new or rare 
being listed. 
Mr. Norton, upon the invitation of Dr. Howard, told of 
certain experimental work on dimorphism that is to be under- 
taken by Dr. C. B. Davenport under the auspices of the Carne- 
gie Institution, at the Biological Station at Cold Spring Harbor, 
Long Island, N. Y. He stated that Prof. W. E. Castle has 
established, in the guinea pig, an experimental form of di- 
morphism which follows Mendel's Law, while he himself 
has found the same law to hold as regards certain plants 
upon which he has been experimenting. What is now to be 
investigated is, whether dimorphism in plants and animls, as 
occurring in nature, follows this law. An interesting object 
of experimentation is the common yellow swallow-tail butter- 
fly (Papilio turnus), in which, in localities where the species 
is double-brooded, there are two forms in the female, one 
black and the other yellow. Extensive breeding experiments 
are to be undertaken to determine, if possible, whether the 
