26 



BULLETIN 265, IT. S. DEPARTMENT OF AGRICULTURE. 



Oviposition of second-brood adults. — Observations were made on a 

 single pair of second-brood adults. The female deposited 34 eggs 

 the first day after she emerged and 40 eggs the second day, making 

 74 eggs in all. 



THIRD GENERATION. 



Incubation period of third-brood eggs. — Seventy-four fertile eggs 

 of this brood hatched in 4 to 6 days after being deposited, with an 

 average incubation period of 4.7 days. No parthenogenetic eggs 

 were secured. 



Length of life of third-brood larvae by instars. — Twenty-nine larvae 

 were reared from fertile eggs, 9 of them pupating, the remainder 

 either dying or burrowing into the earth at maturity and being lost. 

 No parthenogenetic larvae were reared. Table XIV gives a summary 

 of the length of larval life by instars of all larvae reared. 



Table XIV. — Summary of larval life of third generation of the dock false-worm, by instars, 



Wenatchee, Wash., 1915. 



Normal larva. 



First instar. 



Second instar. 



Third instar. 



Fourth instar. 



Fifth instar. 



Sixth instar. 



•« . 



"M 





>M 



■w 





<M • 



«M 





>« 



•>-> 





i-> . 



•n 





,_, 



«w 





03 



O J 



& 



0_w 

 03 



°* 



& 



03 



^ 



:>> 



03 



u .e 



£> 



o M 



03 



"■s 



>> 



O to 

 03 



"■s 



>> 



is 3 







u, 3 





03 



>-. 3 





03 



is 3 







is 3 







is 3 





03 



£2 



n°> 



id 



£3 



£S 



X) 



*2 



j»2 



■0 



£2 



*<» 



-O 



£2 



■*: 



'V 



£2 



^OJ 



■d 



045 



s. 



03 



3 -a 



S, 



03 



S 3 

 3-3 



Fi& 



03 



045 



£> 



03 



pj-a 



0£ 



03 



0a 



0& 



■3 



!3>a 



3 =3 





3 03 





3 03 





3T3 



3 03 





3 03 





3-3 



3 o3 





£43 



fc'° 



e 



fcd 



&' 



&H 



13 .0 



fc:° 



e 



3,0 



Z'° 



fH 



izi.0 



55' u 



Eh 



£.0 



£ ,<J 



e 



1 



1 



l 



3 



1 



3 



3 



i 



3 



1 



1 



1 



2 



2 



4 



7 



4 



28 



6 



2 



12 



17 



2 



34 



16 



2 



32 



8 



2 



16 



3 



3 



9 



2 



5 



10 



19 

 3 



3 



4 



57 

 12 



5 



3 



15 



5 



3 



15 



6 

 2 

 1 



3 

 4 

 6 



18 

 8 

 6 





4 

 5 



28 

 15 









3 



9 

 Av.. 



Max. 

 Min. 







25 

 Av 



Max 





52 



2.1 



3 



24 

 Av 



Max 





50 



2.1 



3 



4.2 

 5 



4 



29 



Av. 





82 

 ..2.8 







15 

 Av.. 





56 

 3.7 









18 





49 









4 



Min 





1 



Min 





1 



Av 

 Max 





2.7 

 6 



Max. 

 Min. 





5 

 2 







Min 





.. 1 





















Min 





1 













Length of life of third-brood pupse. — Pupal records were obtained 

 from 9 pupae of fertile eggs, 4 males and 5 females, and these are 

 given in Table XV. 



Table XV. — Summary of pupal stage of third generation of the dock false-worm, Wenatchee, 



Wash., 1915. 



Number 

 of indi- 

 viduals. 



Days. 



Each. 



Total 



9 42 



Average number of 



days 4.7 



Maximum 6 



Minimum 4 



