66 



due to the apparent sinking of the scale into the bark. With regard to 

 ancylus, it is widely distributed in Maryland, and he has also received 

 it from Ottawa, Canada. It is often associated with forbesi. Gossyparia 

 ulmi he had recently found in Maryland on old trees growing on the 

 estate of General Myers. The trees had doubtless long been infested 

 and the lower branches had been killed. Pseudococcus aceris occurred 

 in the Allegheny Mountain regions of Maryland, maple trees being quite 

 defoliated in certain streets in Cumberland. He had bred the larva of 

 a predaceous fly (Baccha sp.) from this scale in considerable numbers. 

 In answer to a question, he stated that he had never noted that forbesi 

 was viviparous in Illinois, but that there might be a viviparous form in 

 the fourth brood in the south. 



Mr. Alwood stated that he had not yet found forbesi in Virginia, but 

 that specimens coming from Southern States to him both in winter and 

 summer had invariably proved to be viviparous; in fact, he had 

 examined a good deal of material and had never seen an oviparous 

 specimen. 



Mr. Howard said that according to Green's generalization the species 

 should be oviparous, since its anal plate bears grouped pores. Refer- 

 ring to the pitting occasioned by scale insects, he stated that this was 

 most notable so far as his observations went in the case of Aster odiaspis 

 quercicola. 



Mr. Cooley, at Mr. Howard's request, gave some notes on the occur- 

 rence of the latter species in the Middlesex Fells, where it was most 

 generally distributed both on white oaks and swamp white oaks. He 

 had not found it on black or red oak. It occurred also on old English 

 oaks at Medford, indicating its long existence in that region. 



Mr. Howard mentioned the fact that it was probably introduced 

 upon the Department grounds at Washington about 1870. 



Mr. Kirkland stated that the old English oaks in Massachusetts 

 referred to were from 50 to 75 years of age. He also gave further notes 

 on the occurrence of this species in Massachusetts, and also of Gossy- 

 paria ulmi. Referring to the killing of trees by Aspidiotus ancylns, he 

 instanced some plum trees killed by this scale in Massachusetts. He 

 stated that the San Jose scale had been found at Fairfield, Mass., at 

 an elevation of 1,300 feet. 



Mr. Barrows stated that Gossyparia ulmi was very abundant on the 

 grounds of the Michigan Agricultural College. He thought it very 

 likely that it was carried from place to place by the agency of "honey 

 dew," which attaches the young lice to flies or other insects. He was 

 very skeptical about scale insects being carried abont by birds. 



Mr. Johnson called attention to the great injury experienced, espe- 

 cially in parts of western Maryland, from Lecanium nigrofasciatum 

 Pergande (MS.). He referred to the driving out of the San Jose scale 

 by honey dew secreted by the pear tree Psylla in a certain orchard in 

 Maryland. 



