No. 515] BREEDING HABITS OF AMBLY STOMA 



of the migration in 1908 came when the maximum air 

 temperature ascended to 60° or 70° F. In two other 

 years the same conditions obtained as shown in the ac- 

 companying data: 



1901, April 21. 

 1901, April 22. 

 1907, March 27. 



The males begin the migration, as the following table 

 will indicate: 



Thus we see the males began the migration. The next 

 evening, the females appeared in small numbers and the 

 third evening they predominated and continued thus for 

 the remainder of the migration. 



In 1908, the migration each evening across the railway 

 began between 7 :30 and 8 :00 o 'clock. By means of an 

 acetylene lamp, the salamanders were observed crawling 

 along close to the rail, often following it for some dis- 

 tance. At times they were seen attempting to cross the 

 track by raising themselves erect on their tails. Kvcn 

 with this aid, scarcely more than the head came above 

 the rail. In this position they often remained until 

 crushed by the passing cars. Generally, however, they 

 followed along the rail until they came to the joints, 

 where the projecting bolts enabled them to work their way 

 over. 



The evening upon which spermatophores were first de- 

 posited, two salamanders were seen "nosing" each other, 

 and one of the two depositing spermatophores. Neither 

 was captured, and so to determine if this were a part of 

 the regular courtship of the species, several salamanders 

 collected along the track were taken to the laboratory 



