Ninth Report of the State Entomologist 325 



Distribution. 



As already stated, the pear-tree Psylla is known to have occurred at 

 Salisbury, Conn., in 1833, and it was probably operating in an eastern 

 county in New York in 1824. At the time that Dr. Harris wrote of 

 it — in 1852 — it was known to him "in the western part of Con- 

 necticut and Massachusetts, particularly in the valley of the Housatonic, 

 and in the adjoining counties of Dutchess and Columbia in New 

 York." * 



Little is known of the extent of its eastern distribution in the New 

 England States. Mr. T. S. Gold found it "several years ago" in TV est 

 Cornwall, Conn., ten miles south-east of Salisbury. Coe Brothers first 

 noticed it in their pear orchards at Meriden, New Haven county, Conn., 

 ten or fifteen years ago, where it has been quite destructive in certain 

 years. Mr. Fisher lias had the opportunity of studying its habits at 

 Fitchburg, in northern Massachusetts, neaiiy one hundred miles from 

 Salisbury. That it is rather a local insect would appear from the 

 f5tatement that it is not known to the Messrs. Coe in any other portion 

 of the State, and furthermore, that it has not appeared in a young pear 

 orchard (set out in 1881), which is only a half-mile distant from their 

 badly infested orchards. 



Along the Hudson river valley it has been injurious in Rensselaer, 



Columbia, Dutchess, Greene, and Albany counties. Its presence has 



not been reported in the extreme south-eastern counties of New York, nor 



is it known to Dr. J. B. Smith to occur in the State of New Jersey.* In 



Central New York, Mr. M. V. Slingerland has been able to make valuable 



studies upon it at Ithaca, Tompkins county. In Western New York it 



must occur sparingl}^ if at all, for Mr. E. P. Van Duzee, who has been 



giving careful study to tlie Hemiptera for several j'ears past, reports 



"no observed injury from it," nor is he able to identify the species, as 



described in Dr. Loew's paper, among the seventeen species of Psyllids 



contained in his collection. Professor A. J. Cook does not know 



of its presence in Michigan. Professor F. M. Webster has found it 



abundant in Ohio; and Dr. LeBaron has written of its presence and 



injuries in Illinois. 



Its Injuries. 



The injuries resulting from»formidable attacks of this insect are the 

 •consequence of the large amount of sap which the myriads of indi- 

 viduals draw from the twigs, buds, leaves, leaf-stalks, and fruit-stalks 

 of an infested tree, and eject in the form of "honey-dew," thickly 

 coating the surface and thereby preventing the normal vital action of 

 the leaves and bark. 



* It has since been observed in New Jersey by Dr. Smith. 



