New Yokk Agricultural Experiment Station. 315 



being carried about the same distance each time. In every 

 instance but one the larva was blown off, and when the leaf to 

 which the larva had successfully clung was again released from 

 the same place the larva did not succeed in clinging to it. 



Insects. — At various times from August 26 to October 11 insects 

 that were found on infested trees were caught and examined to 

 see if larvae were clinging to them. The following is a list: 



Grasshoppers. On August 26 one grasshopper was found with 

 four larvae clinging to it; and on August 29, another with one. 



Aphis lion, Cliysopa. On August 29 two' aphis lions, with one 

 larva caught in the hairs on the upper surface of posterior wing 

 of each were found. 



Flies, Sarcophagidw. One individual was found on the same 

 .date with a larva clinging to one of its legs. 



Beetles. A specimen of Euphoria mda was found September 

 1 with seven larvae clinging to it. 



At various times also twelve wasps, representing four species, 

 80 honey be-es, 24 ants and two dragon flies were examined, all 

 of which were taken from trees upon which the young larvae were 

 very numerous and crawling about actively, but no larvae were 

 found. In the case of the Hymenoptera it is not improbable that 

 their cleanly habits account for the lack of San Jo&6 scale larvse. 



CONTROLLING THE INSECTS FOR THE PURPOSE OF 



STUDY. 



One of the difficulties in the way of accurate and extensive 

 observation upon the development of this species has been the 

 difficulty of keeping the active forms within sufficiently narrow 

 limits. To obviate this difficulty, two simple methods were 

 resorted to. First, the use of bands of cotton wool tied about 

 the trunks of small nursery trees or the limbs of larger trees. 

 These bands were placed from one to two inches apart and pre- 

 vented the escape of larvae placed on the bark between them. 

 Plate LII, Fig. 1. Second, cells made by cementing glass or 

 metal rings to the bark or fruit with melted paraffin. Half-inch 



