July 3. 1916 



California Green Lacewing Fly 



521 



The third-instar larvae (fig. 4), while having a period of life averaging 

 about the same in length as that of the second instar, make up for it in 

 the number of aphids consumed. Fifteen larvae in March each ate an 

 average of 9X aphids a day or 55^ during the entire period; whereas 11 

 larvae each ate an average of nearly 

 22 full-grown aphids a day or 98 for 

 the third-instar period, this being 

 nearly twice as many as are eaten 

 during the first and second instars. 

 In Table IV it will be noted that a 

 third-instar larva of C. californica in 

 cage 59-14 ate 40 full-grown Aphis maidis in one day of 24 hours. The 

 average length of the third instar was 6 days in March and \yi days in 

 October. 



Tables III and IV show the daily consumption of aphids by 26 larvae 

 during their entire larval period. 



Fig. 4. — Chrysopa californica: Third instar. 



Table III. — Daily feeding record of 75 larvce of Chrysopa californica at Tempe, Ariz., in 



February, lQl5 a 



Cage No. 



Date hatched. 



February. 



24 25 26 27 2 



March. 



78-1.. 

 78-2.. 

 78-3.. 

 78-s.. 

 79-1 . . 

 79-2.. 

 79-5- • 

 80-3.. 

 80-5.. 

 80-6.. 

 80-7.. 

 80-9.. 

 80-10. 

 80-1 1. 

 80-12. 



Feb. 23. 



....do.. 



....do.. 



....do.. 



Feb. 24. 



....do.. 



....do.. 



Feb. 25. 



do. . 



do.. 



do.. 



do.. 



do.. 



...ido.. 

 do.. 



m 3 

 to o 



to 1 



to o 



to s 

 mz 

 to o 

 to 4 

 to 4 

 to 2 

 m s 

 to 4 

 »3 



Cage No. 



Date 

 hatched. 



March. 



Aver- 

 age 

 mean 

 tem- 

 pera- 

 ture. 



78-1. 



78-3.. 

 78-5.. 

 79-1 • • 

 79-2 . . 

 79-5-. 

 80-3.. 

 80-5.. 

 80-6.. 

 80-7.. 

 80-9.. 

 80-10. 

 80-11. 

 80-12. 



Feb. 23. 



....do.. 



....do.. 



do.. 



Feb. 24. 



do.. 



do.. 



Feb. 25. 



do . . 



do.. 



do.. 



....do.. 



....do. 



do., 



do.. 



to 5 

 TO 3 



TO S 

 TO3 



m 8 



to 4 



TO 3 

 TO 6 



m 8 



10 



TO 8 



8 



TO 6 



°F. 



a to, Date of molting; c, date of spinning cocoon. 



