Sept. 4, 1916 



Aphidoletes Meridionalis 



887 



at night — at least they have been observed by the writer only at night, 

 although the cages were examined much more frequently 

 during the day. 



Egg laying continued over a period of about 10 days 

 in "chimney" cages, and the length of life of the midge 

 under the same conditions was about 14 days. Several 

 unsuccessful attempts were made to induce unfertilized 

 females to lay eggs, although fertilized females laid eggs 

 readily, indicating that this species is probably not par- 

 thenogenetic. 



As will be seen from Table II, the total length of the 

 life cycle from egg to adult varied, in the region in which 

 it was studied, from 15 to 29 days, the average normal 

 life cycle being about 18 to 20 days. The seasonal num- 

 ber of complete generations has not been determined, 

 but there are evidently at 'least six complete generations annually, the 

 winter being passed as larvae and possibly also as pupae within the cocoons. 



Table II. — Length of life cycle of Aphidoletes meridionalis; La Fayette, Ind., July- 



August, IQ12 



Fig. 4. — Aphidoletes 

 meridionalis: Pu- 

 pa, lateral view. 

 Much enlarged. 



Cage No. 



Eggs laid- 



Eggs 

 hatched- 



All 



larvee 



finished 



feeding — 



Cocoons 

 noticed — 



Adults 

 issued — 



Total life cycle. 



Mini- 

 mum. 



Maxi- 

 mum. 



7654(i)c. 

 76 54 (i)d 

 7654(3 )a. 

 7654(4).. 

 7654(4)3. 

 7654(4)0 

 7654(4^. 

 7654(5)a. 

 7654(5)b 

 7654(5^. 

 7654(2)3. 

 7654(2)0 



1912. 

 July 15-16.. 

 July 17-18.. 



Aug. 1 



Aug. 9-1 1. . 

 Aug. 1-3 .. . 

 Aug. 3-5 .. . 

 Aug. 5-7 .. . 

 Aug. 3-7. ., 

 Aug. 5-7 .. . 

 Aug. 7-9. . , 

 July 15-16. , 

 July 16-17. 



July 17-18. 



July 20 



Aug. s-6. . 



Aug. 13. 



July 25-29. . 



Aug. 6. 

 Aug. 7- 



Aug. 7-; 

 July 18. 



Aug. 15 



...do 



Aug. 14 



July 25.. 



July 24-26. 

 July 26 



Aug. 5-14. 

 Aug. 5-13. 

 Aug. 21. . . 

 Aug. 26-27 

 Aug. 22-23 

 Aug. 22-24 

 Aug. 25-26 

 Aug. 24. . . 

 Aug. 23-24 

 Aug. 25 . . . 

 Aug. 1-13. 

 Aug. 4-7.. 



Days. 



Days. 



55851°— 1( 



