200 



MR. A. M. ALTSON ON THE LIFE-HISTORY AND 



Table I. — Showing variations in length of life-cycle. 

 Alysia manclucator . 



Nos. of Jars containing parasitized material and 

 dates when i^arasitiztd. 



Daily 

 Temp, to 



- nearest 

 No. 9. degree 

 6/8/19 : Cent. 



* Artificial heating from 23rd Sept. 

 Thus, contents of No. 1 Jar took to complete cycle 33-58 days ; No. 2, 51-56 days ; No. 3, 

 50-57 days: No. 4, 51-56 days; No. 5, 53-55 days : No. 6, 49-55 days ; No. 7, 44-68 days; 

 No. 8, 45-57 days; No. 9, 40-69 days: giving a general average of 46|-59 days with a mean 

 average of 52. 



