1122 General Notes. 
According to my researches there are the following American 
Tronychide. 
Platypeltis Agass. 
1. Playpeltis agassizii mihi. = Platypeitis ferox Agass. non 
Schneider. 
Aspidonectes Wagler. 
2. A. ferox Schneider. 
. A. asper Ag. 
4, A. spinifer, Les.=A. nuchalis Ag. 
5. A. emoryi Ag. 
6. A. muticus Les. 
At the same time I should like to call attention to the enormous 
sexual difference in Aspidonectes muticus Les. It is well-known 
that the males have very much longer tails than the females on 
all the Trionychide. The male of A. muticus has the plastron 
more develo than the female: the Hyo-, and Hypoplastra 
meet with the callosities nearly in the median line. The callosities 
extend very much more in the male than in the female; in an 
adult male the callosities cover the plastral-bones entirely A 
very peculiar circumstance is, that the adult male is only about 
half as large as the adult female and that the males are in consid- 
erably smaller number than the females. Among thirty-six 
specimens of A. muticus from the Ohio River, there were only 
seven males. The fishermen consider the males and females as dif- 
ferent kinds of animals, so great is the difference. 
Ido not know yet, whether the other Trionychide show the 
same considerable sexual difference. It is very interesting, however, 
that Podocnemis shows it. — 
Toao Martins da Silva Coutinho,! makes the following remarks 
about the male of Podocnemis expansa. 
“The male, named Capitary, is distinguished from the female, 
by its size; it is only about 0, 7 m long (the female 1, 2m and more) 
and the tail which is twice as long, reaches a length of 1. 2 m.— 
The circumstance that only a smal! number ot Capitary are found 
among hundreds of females, proves, in some way, that a single male 
_ is sufficient for the fecundation of a greater number of females.” — 
iw) 
-= Q. Baur, New Haven, Conn. 
_ _ McGee on Mrapow Larks anp RILEY on ENGLISH SPAR- 
~ ROWS.—Ata meetingof the American Ornithologists’ pers held ” 
the hall of the National Museum in Washington, Prof. McGee, 
the Geological Survey, read a paper detailing his observations upon 
the two forms of North American meadow larks, as found in Iowa. 
ma tion, Avril, 1 e : Amazone, Bulletin de la Société Impe | 
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