131 



(lisai)i)caro(l. Moved this lot into the; nlhcx), whore it, was kept at the 

 usual temperature of a liviii^-rooni. November 9. Lice luoltiii^' and 

 apiKiaring with wings. r'ungus-covci'cMJ s|)('cini(Mis under this glass. 

 November 10. Increase in mutiber of wingecl specimens. November 

 12. Still larger mnnber of winged lice, but no increase in number on 

 the wheat. November IS. Winged lice numerous but veiy few wing- 

 less. Some young born last night. November 14. liu^reascid number 

 of very young, evidently from winged females. November 15. Young 

 lice plenty. Winged ones few. November 17. Some very young lice 

 this morning, but no fresh winged specimens. November 20. Insects 

 growing slowly; ])erhaps because of (H)lder weather. November 21. A 

 few winged lice this morning. Ten yomig found by dissection in bodv 

 of wingless female. November 28. No winged lice this morning, but 

 wingless ones numerous, and all full grown. November 24. Additional 

 yovmg born. November 26. One wing(>d louse present. Adults grow- 

 ing very slowly. November 27. Two winged lice and murusrous wing- 

 less. November 29. But one winged louse seen. Wingless of almost 

 all ages, some very young, only a few hours old. November 30. Two 

 winged lice and a large number of wingless ones. December 1. A 

 number of wingless and young this morning, but none winged. Decem- 

 ber 3. Increasing number of winged lice and young, but- many turning 

 black and dying, as in other cages. December 4. Alore winged lice 

 than yesterday. Decein})er 6. Increased number of winged lice, and 

 also of very young. December 11. Lice changed to fi'csh plants doing 

 well. Look fresher and more active. December 12. Several winged 

 lice under this glass and many wingless ones. Dec(>ml)er 13. Very 

 larg(! increase in niunber of winged lice. All s(H'm to Ik; in the best 

 condition. Deceml)er 14. Not so many to Ijeseen this morning. D(!ceni- 

 ber 17. Lice dying. Dead l)lackened, like those brought in on sorghum 

 when they died. Very few left alive. I'Voni this time forward insects 

 in this lot died rapidly, and presently all disappeared. 



Experiment' 4. Begun November IS, with corn and wheot under bell 

 glass. Supplied with plant-lice from sorghum brougld in. front, Pulaski 

 county. — November 14. Well stocked with Aphis maidis. November 

 15. Lice spread all over the corn. Novemb(!r 20. Nearly all dead. 

 Blackened bodies immerous under the plant. ( )nly one winged sijccimen 

 seen alive. November 29. Two winged and very few wingless. S(!veral 

 of latter alive on earth beneath the plants. Caniful search of surface 

 roots of both corn and wh(;at was made for eggs, but, none wci-c found. 

 November 30. Three winged and a very few wingless. A number deatl 

 on corn and wheat. December 1. A few of both winged and wingless 

 plant-lice yet alive. December 3 and 4. Similar entries made. Decem- 

 ber 6. Thr(!(! wingless and one winged sf)ecimen living. D(H;ember 10. 

 All dead and gone. 



