242 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. . 15 



one lived 651 days and the other 1000 days. Of the twenty-six larvae 

 which hatched from eggs, eleven lived an average of 822 days with ex 

 tremes of 628 and 1248 days. One larva which hatched July ^7 igig 

 pupated July 16, 1920, giving a larval period of 720 days. Another 

 one that hatched August 17, 1918, transformed [uly 12, 1921 having 

 lived as a larva 1056 days. A number of worms' collected in 1919 also 

 lived two years or more. 



The number of molts was detemiined in a few cases and in one in- 

 stance m which the larva completed its ^growth, eleven molts were 

 noted. Table 1 is presented to show the num.ber and frequency of 

 molts of several larvae and is typical of the others under observation 

 Zvierezomb-Zubovsky'= records but five molts. He states that Jarvae 

 molt about 27 to 31 days after hatching, the subsequent molts occuring 

 at intervals of from 9 to 10, 10 to 14 and 20 to 24 days, respectivelv 

 About 22 to 27 days after the fourth molt the last skin is shed and t.he 

 larva is ready to pupate. 



Table I-Showing the Nltmber and Frequency of Molts of Cadelle Larvae 



Larva No. 

 Source 



16.5008 



Collected 

 Sept. 7, '16 



18.1082 



Hatched 

 July 27, '18 



18.1092 



Hatched 

 July 27, '18 



19.1639 



Collected 

 Oct. 27, '19 



Molts 



Oct. .5, '16 

 July 27, '17 

 Sept. 14, '17 

 Sept. 19, '17 

 Oct. 17, '17 

 July 1.5, '18 

 Sept. 3, '18 

 Oct. 5, '18 

 June 25, '19 



Sept. 30, '18 

 Oct. 12, 'IS 

 June 20, '19 

 Aug. 23, '19 

 Apr. 15, '20 

 July 23,' 20 

 Aug. 1, '21 

 Sept. 18, '21 

 Oct. 10, '21 



Sept. 30, '18 

 Oct. 5. '18 

 June 20, '19 

 Aug. 2., '19 

 Nov. 11, '19 

 Jaly 16, '20 

 Aug. 2, '20 

 July 2, '21 

 July 16, '21 

 Aug. 9, '21 

 Aug. 31, '21 



June 25, '20 

 July 23, '20 

 Aug. 30. '20 

 June 3, '21 

 July 8, '21 

 July 25, '21 

 Aug. 12, '21 

 Aug. 25, '21 

 Aug. 29, '21 

 Sept. 26, '21 



19.1641 



Collected 

 Oct. 27, '19 



June 11, '20 

 June 25, '20 

 July 23, '20 

 Aug. 30, '20 

 June 9, '21 

 June 16, '21 

 July 25, '21 

 Sept. 9, '21 

 Sept. 30, '21 



Remarks 



Died 



Still alive 



Semi-pupa 



Still alive 



Died 



Very little data were secured on the other stages probably because' 

 the proper conditions were not offered for pupation. The length of 

 the prepupal stage was obtained in one case and occupied nine days 

 Ihe pupal stage was determined in two instances and was found to be 

 12 and 13 days, respectively. The complete life cycle as found in one 

 mstance was 1085 days. Should the larva which hatched in 1918 

 and IS still alive complete its development, the life cvcle will be approx- 

 imately four years. 



The results of these observations open the question of whether the 

 life cycle is normally one year, as stated m most of the economic liter- 

 ature of this species, or whether it is much longer. Wule the larvae 

 were re ared under conditions somewhat different than those occuring 



"Op. Cit 



