436 JOURNAL OF ECONOMIC ENTOMOLOGY [^'ol. 7 



yielded on March 22, 1913, eighteen living Lissorhoptrus adults and 

 thirteen dead ones in the dead grass at bottom of cage. 



The following account of a cage test to determine the number of 

 generations of the rice water-weevil is copied verbatim from the notes 

 of the writer: 



"Crowley, La., July 22, 1912: A few days ago I emptied Cage No. 

 3, and placed therein a pan of young growing rice. Today I released 

 thirteen young adult Lissorhoptrus reared from pupse, in this pan. 

 Also placed in bottom of cage some dry grass suitable for hibernating 

 quarters, and hung a bunch of Spanish moss in the opposite end of the 

 cage. 



July 26, 1912^Placed two more reared adults in pan. 



July 27, 1912 — Placed one more adult in pan. This one taken from pupa case in 



field. 

 July 31', 1912 — -Placed one more reared adult in pan. 

 August 1, 1912 — -Placed one more young adult in pan. 



"September 18, 1912 — Pulled up all rice in pan and washed out 

 roots in water. Only one small Lissorhoptrus larva found. Removed 

 moss from cage and found two adult weevils in it. Removed dead 

 grass from bottom of cage and found 114 weevils in it. Two weevils 

 found in cage neither in moss nor grass. " 



From the foregoing it would appear that where a generation of 

 weevils mature in early rice in the spring there is a possibility, and a 

 strong probability, of a second generation in late rice. For example, 

 near Rayne, La., on April 15, 1913, the writer found rice water-weevils 

 active in a field of recently flooded rice. By June 1, young adults 

 were probably produced in this field. At that time of year there was 

 plenty of young rice recently flooded in which these young adults could 

 deposit eggs for another generation. 



The following field notes were made by the writer in the fall of 1912: 



"Crowley, La., September 27, 1912: In a field of Japan rice, about 

 a quarter of a mile east of the experiment station, I found today a few 

 living larvae of L. simplex and three pupse. These probably belong to 

 the second generation of the season. Larvae and pupae, however, were 

 scarce. A large number of rice plants were pulled up to find the 

 specimens just noted. The rice is headed out and apparently ripe 

 enough to harvest. Field has been drained but water still stands in 



