Insect Migrations in Trojncnl America. 161 



(Mr. E. Johnstone, San Fernando). " Flew in thonsands 

 past the pier " (Mr. Potter, La Brea). 



Mr, Guppy says the moth is generally common about 

 July and August, abundant in September, and by October 

 only solitary examples are seen. He found eggs and 

 caterpillars in Trinidad, and was thus able to show that 

 the island is not entirely dependent for this insect on 

 migrations from the mauiland. 



" Since 1901 they have not been common " (Guppy, 

 loc. cit., written in 1906). 



1912. On the 4th September of this year Mr. C. M. 

 Carmona of San Raphael wrote to Mr. F. W, Urich as 

 follows : " Since this morning a large amount of butter- 

 flies has been passing over here at an altitude of 60 or 70 

 feet, and increasing in numbers more and more. They are 

 coming from the south and going straight north." Some 

 of the " butterflies " were enclosed, and were identified by 

 Mr. Urich, to whom I am indebted for the record, as 

 Cydamon leilus. 



In this year the moth appeared in numbers in Barbados 

 and British Guiana (see below). 



1917. I was in Trinidad in the fall of 1916, but did not 

 notice any unusual abundance of C. leilus. In 1917, how- 

 ever, a very distinct migration took place, of which I give 

 the following records from my own notes. 



On 11th September a number of isolated specimens were 

 seen throughout the day at La Foitunee (about six miles 

 south of San Fernando) all flying towards the north-east 

 quarter. 



On the following day (r2th September) at Malgretout 

 (about six miles east of San Fernando) isolated specimens 

 were again seen flying in the same direction. About 

 40 specimens were seen during the day. 



On the 13th September at Tarouba (two miles east of 

 San Fernando) they were still flying in the same direction 

 in small numbers. 



From this date until the 23rd I was unable, owing to 

 illness, to make any observations, but I was given to under- 

 stand that the moths continued to fly at Tarouba in about 

 the same mimbers ; and an officer of one of the motor patrol 

 boats informed me that he saw them flyuig over the sea 

 at Cedros in the same direction. 



On the 25th September they were again seen at Tarouba 

 passing in much greater numbers, all going north-east 



TRANS. ENT. SOC. LOND. 1920. — PARTS I, II. (JULY) M 



