EXPERIMENT STATION REPORT. 581 



year, they occurred in almost countless numbers. It seents in- 

 credible that the spraying done should have been so thorough as 

 to kill off these insects completely and yet leave plenty of scale 

 uninjured. 



Walked from the Rumph to the Willingham Orchard, a small 

 plantation for that part of Georgia, and found a plum orchard 

 quite badly infested by a white scale, Pidz'inaria amygdali. Into 

 this orchard the beetles had been introduced from ihe Rumph 

 Orchard in 1903, and had increased abundantly. The orchard 

 had been sprayed, but not effectively and there was plenty of liv- 

 ing and moving pernicious scale. Here we found similis in all 

 stages, larvae, pupae and adults ; but on only a few trees and feed- 

 ing only on the white scale ; the pernicious scale was apparently 

 untouched. Remained at this place until noon and m that time 

 collected about 80 specimens which we divided into four colonies ; 

 two of them for New Jersey and two of them for Florida, where 

 Mr. Newell is trying to establish the species in a yet warmer 

 climate, hoping to bring later generations north if thty multiply. 

 On the best tree we found 25 specimens in all stages ; but most of 

 them had none at all and few had more than a single specimen. 



On these trees, Mr. Scott and Mr. Kotinsky of the Entomo- 

 logical Division at Washington found the native Chilocorus 

 bivulnenis in swarms in May and with them a very few C. similis. 

 Some colonies of these mixed species were collected and sent out, 

 while Mr. Kotinsky carried one colony with him and liberated the 

 specimens at Dublin a day or two later. 



It is worthy of note that the C. bivulnei'us -has in Georgia 

 similar habits to those that I noted in New Jersey, viz., there is a 

 brood in spring and then the beetles disappear until fall. In our 

 week's collecting only one C. bivulnerus was taken, and that Mr. 

 Newell found on a sunflower at Marshallville. 



The plum orchard in which these collections were made is on a 

 hillside and most of the trees on which specimens were actually 

 foimd were pretty well down and along a water course which was 

 dry at the time. There seemed to be nothing in this position that 

 reasonably accounted for the survival of the insects ; yet they 

 were not found elsewhere. 



By way of Macon and Hawkinsville, we reached Dublin, 

 Friday, July 22nd, and called at the home of Col. John M. Stubbs 

 to secure permission to investigate his home orchard. This con- 

 sisted of about 100 plum' trees of selected varieties, all infested by 

 scale, some of them dead or dying, and on these we found speci- 

 mens of Chilocorus similis, mostly in the adult stage. In two 



