246 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 10 



On the nth of Maj^ adult parasites continued to issue, from the in- 

 troduced lots, but the cool weather retarded their activity and they had 

 not distributed themselves very far from the points where we made the 

 introductions. At a point one hundred and fifty yards east of the 

 point of introduction in one of the fields, where introduction was first 

 made, a number of parasitized aphids were found, and among them 

 several winged forms, which indicated that some of these parasites had 

 come in from abroad, and were not of those introduced. Again at five 

 hundred yards east of the point where the introduction was made, 

 bordering on the east side of the field, several parasitized Toxoptera 

 were found, among them several winged forms; it is even more prob- 

 able that these came in from abroad. The winged forms had been 

 very numerous during the last few days, flying toward the north, and it 

 would appear that these winged forms which had blown in from the 

 south had lighted in these fields and had changed to the brown form, 

 containing the parasite, and were not from the sources of introduction. 

 This was further proven by the fact that the parasites which oviposited 

 into the aphids on the morning of the 5th had not yet caused the aphids 

 to turn brown, and further, by the fact that winged forms collected 

 while in flight were changing to the brown form in the laboratory. 



On the 18th of INIay there were not as many brown aphids to be 

 found in the fields of first introduction as there were on the 11th of 

 May, and in the fields where the second and larger introductions were 

 made only a few adult parasites could be found, and it was difficult to 

 find parasitized aphids away from the points of introduction. The 

 cool weather between the 11th and the 18th had prevented them from 

 multiplying or parasitizing anj- more aphids. The situation was grow- 

 ing worse daily with the weather continuing cool and dry. So far as 

 could be determined, therefore, the intrx)duction of the parasites was 

 not a success, owing to the fact that practically as many parasites came 

 into the field unaided by us as we introduced. The Toxoptera were 

 devastating the oats and damaging the wheat very badly in spite of the 

 parasites we had introduced. 



An Important Excursion 



Prof. G. A. Dean was regularly advised of the situation in southern 

 Kansas by his assistants, J. W. McColloch and T. H. Parks. A tele- 

 gram from Professor Dean stated that he, together with Professors 

 Jardine and Call, would come to "Wellington Monday morning, May 15, 

 if the weather was suitable for auto travel. When they reached Wel- 

 lington they informed me that it had been raining at Manhattan for 

 several days, and that they had come through a heavy rainstorm all 

 the way from ^lanhattan to about five miles south of Wichita. This 



