April, '17] KELLY: GREEN-BUG OUTBREAK 241 



wheat fields on farms which I had visited several times recently. The 

 wheat field on the Wilkerson farm, which was pastured in the fall, thus 

 being freed of the pest, was also heavily infested at this date, and to the 

 south an oat field was very heavily infested. We expressed an opinion 

 that the Toxoptera were not abundant enough in the oats nor in the 

 wheat to cause alarm. We visited the Treekman farm, where they 

 were numerous in the fall, the wheat being practically devastated, 

 except near the north edge, and Mr. McColloch found one parasite in a 

 brown aphid. Living aphids collected from the Treekman field gave 

 us a few parasites within the next ten days. Continuing the trip south 

 from Harper, by way of Anthony, to Manchester, Oklahoma, we found 

 Toxoptera much more abundant and began to change our opinion to one 

 of some probability of serious damage, and accordingly Mr. McColloch 

 wired the authorities at Manhattan that "the 'green bug' was gener- 

 ally distributed over all grain fields in Sumner and Harper counties, and 

 if cool weather should prevail the next two weeks, the injury would be 

 great, especially to oats, not only in southern Kansas, but probably 

 over the greater part of the state." On the return trip from Man- 

 chester by the way of Bluff and eight miles south of Argonia, we found 

 the "green bugs" much more numerous than we had along the Chis- 

 holm Trail. We did not find parasites elsewhere than on the Treekman 

 farm, but the collections of Toxoptera from the vicinity of Manchester 

 gave us parasites later. 



On the morning of the 29th of April, ]\Ir. Hungerford, together with 

 Mr. Wellhouse, a student assistant of the University, arrived in Wel- 

 lington. These men, together with Mr. McColloch and myself, drove 

 east of Wellington toward Winfield, south to Arkansas City and on 

 south to Kildare and Blackwell, Oklahoma, back by the way of Ren- 

 frow and South Haven. We found the species present in oat fields 

 between Wellington and Oxford ; in the oats and wheat to Winfield and 

 to Arkansas City, but very scattering. One mile south of Arkansas 

 City we found a forty-acre wheat field practically devastated, this 

 being the heaviest infested field we had found in two days' drive. 

 A careful search by these gentlemen and myself indicated that there 

 were no parasites present. A number of aphids were collected and put 

 in breeding cages, but no parasites issued. South of Arkansas City to 

 Newkirk and Kildare we found a number of heavily infested oat and 

 wheat fields. A number of the aphids were collected, but from these 

 no parasites were reared. In the vicinity of Blackwell, Toxoptera were 

 rather abundant. East of town there seemed to be no injury. They 

 seemed to become more numerous as we went toward Blackwell from 

 Kildare. Going west from Blackwell, we came to some of the fields 

 which were heavily infested in the fall of 1915. These fields were being 



