176 Maine Agricultural Experiment Station. 1918. 



DESCRIPTION OF THE PUPA. 



Description of the just formed pupa. Yellow ; setae and 

 spiracles brown ; caudal spines black ; otherwise exactly like 

 A. corni (see page 160). Length 3-35 mm.; width 1.5 mm. 



Description of pupa ready to transform. Dorsum of pro- 

 thorax with irregular blackish splotches ; metathoracic thicken- 

 ings brown; eyes, interocular region and mouth parts black; 

 wings dark gray or black ; coxae, trochanters, and femora brown, 

 the rest of the leg piceous, except the tarsi and the femoro-tibial 

 joints which are black ; otherwise like the newly formed pupa. 

 (The elytra are colorless although they appear gray as the wings 

 lie underneath them and show through.) 



Biological History. 

 summary of rearixgs. 



Length of egg stage. A record which was kept of 59 eggs 

 deposited between July 22 and July 31 inclusive, may be tabu- 

 lated as follows : 



18 hatched in 6 days, 37 in 7 days, and 4 in 8 days ; average 7 days. 

 Length of the first larval instar. A record which was kept 

 of 104 larvae which hatched between July 16 and July 30 in- 

 clusive, may be tabulated as follows : 



18 molted to the second instar in 3 days after hatching, 76 in 4 

 days, 5 in 5 days, and 5 in 6 days ; average 4 days. 



Length of the second larval instar. A record which was 

 kept of 96 larvae which molted to the second instar between 

 July 18 and August 3 inclusive, may be tabulated as follows : 



7 molted to the third instar in 2 days after the first molt, 32 in 3 

 days, 40 in 4 days, 16 in 5 da3 T s and 1 in 6 days ; average 4 days. 



Length of third larval instar. A record which was kept 

 of 97 larvae which molted to the third instar between July 17 

 and August 12 inclusive, may be tabulated as follows: 



2 entered soil in 2 days after the second molt, 43 in 3 days, 19 in 

 4 days, 19 in 5 days, 10 in 6 days, 3 in 7 days, and 1 in 8 days ; average 

 4 days. 



Length of the pre pupal period. A record which was kept 

 of in prepupae which entered the soil between July 20 and 

 August 12 inclusive, may be tabulated as follows: 



