59 



bers, and it was a continual fight between ns and the beetles as to 

 which should have the lice. 



The larvai of Scymnus, as well as certain Syrphid flies and Chrys- 

 opidae, also preyed upon this Aphis. 



In the discussions of this paper Mr. Ashmead said that the record 

 of this neAV Aphis attacking the stone fruits was very interesting, in- 

 asmuch as this group of plants already suffered from the attacks of 

 half a dozen well-known species of plant-lice. He suggested that the 

 Aphididfe afforded a splendid field for investigation, and that there 

 was pressing need for such work. He said that Mr. Pergande was 

 authority on this group and had in his possession the types of both 

 Riley and Buckton. 



Mr. Bruner said that his former assistant, the late Mr. Williams, 

 did extensive work upon the aphides, 

 describing 35 species, but that his 

 work had not yet been published. 



Mr. Gillette called attention to the 

 great danger of the black peach 

 Aphis being disseminated on nur- 

 sery stock, and said that it had been 

 thus communicated to Colorado from 

 Missouri. 



Next in order was a talk upon 

 with fungous 

 Bruner, Lincoln, 



Fighting insects 



Fig. L— Aphis n. sp: wingless form fourth 

 geueration, fourth stage, much enlarged 

 (from drawing furnished by Scott) . 



diseases," by L. 

 Nebr. 



Mr. Bruner said in part that the 

 successful control of the chinch bug 

 in some sections by means of a 

 fungous disease had been a great 

 calamity to working entomologists, 

 because this success had created 

 a false belief that injurious insects in general could be controlled by 

 fungous diseases. As examples of insects destroyed by fungi he 

 mentioned the chinch bug, locusts, and house flies. He said that the 

 disease among grasshoppers would act only when conditions were 

 favorable; that a grasshopijer might eat a diseased one and be immune 

 if conditions were not just right. 



He had received from the Department of Agriculture what was 

 supposed to be' the South American locust disease, which proved to 

 be only a Mucor. The material was distributed over Nebraska, and 

 while some who received it reported good results, others "cussed." 

 In his experiments he had found that none of the locust diseases were 

 successful. 



