Life Ilisfortj of ceriain Little-known Aphid id(e. 211 



first time May 2 and for the second time May 5. Unfortun- 

 ately it died May 7, but it had become large enough to be rec- 

 ognized as a corn root louse. 



In the nest where the above eggs were found were two 

 very small plant lice, presumably hatched from the same lot 

 of eggs as those mentioned above. These were placed ( April 

 25) in a glass tube on a corn root, and T succeeded in bring- 

 ing one of them to maturity, but the other died shortly after 

 being transferred. The one that developed proved to be a corn 

 root louse, and from it seven larvte were born between May 9 

 and 15, at which latter date it died. 



On April 29 I collected in the field several partially grown 

 corn root lice on roots of Setaria and smartweed and placed 

 them in a vial with earth and a Setaria sprout. May 4 one of 

 the lice had apparently become adult, and it was transferred to 

 a corn root inside a glass tube. May 5 it had fastened its beak 

 in the root but no young had appeared; its markings were be- 

 coming more distinct. The following day a young louse was 

 born about noon. The next morning ( May 7, at 8 a.m. ) no more 

 young had been brought forth, but twenty-four hours later 

 three more had appeared. The larvte continued to be born 

 until the 15th, when twelve had been brought forth, at which 

 time the adult died. 



Two of the young born from this stem-mother were 

 brought to maturity, and curiously enough one of them was 

 winged and the other apterous. The former, presumably one of 

 those born May 6 or 7, became a pupa May 15 and did not 

 again moult until May 19, when it became a full fledged adult. 

 It was kept in the tube until May 22, but it brought forth no 

 young up to that time, and did not insert its beak in the corn 

 root, being apparently anxious to escape. 



The wingless specimen was taken out of the tube where it 

 was born, May 8, when it was not over a day old. It passed its 

 last moult May 19, and the first larva was born from it May 21. 

 Another was born the next day, when the observations ceased. 



June 14 a hill of corn in the field which showed evidence 

 of the presence of Lasius alienus was stocked with corn root 

 lice. The lice were placed about the burrows of the ants and 



