THE MONTHLY BULLETIN. 



117 



THE PEAR THRIPS. 

 Twniothrips pyri (Dauiel). 



The distril)uti()n of the pear thrips is chiefly confined to a rather 

 small district cxtondino: from the San Francisco Bay region up the 

 Sacramento and San -loacinin valleys for short distances. The area 

 is well known and fairly constant and the additional discoveries have 



F tL OOIWOOJ 



Map showing the dis- 

 tribution of the peur 

 thripe , Tae niothripa 

 pyri (Daniel), in Cal- 

 ifornia, January 1V16. 



O'/ 



ESSlg 



Fig. 45. — Showing the distribution of tlie pear 

 thrips, Tftniothrips pyri, in California. (Orig- 

 inal.) 



only enlarged the boundaries. The following counties are partially 

 or entirely included in the district : San Francisco, San Mateo, Santa 

 Clara. iMonterey, San Benito, Alameda, Contra Costa, San Joaquin, 

 Sacramento, Yolo. Solano, Napa, Sonoma and Marin. 



THE CALIFORNIA PEACH BORER.* 



JEgeria opalescens (H. Edwards). 



The economic significance of this insect is very interesting. Though 

 the adults are reported to have been repeatedly taken by collectors in 

 the Sierra Nevada mountains, the insect has become a serious pest in 

 only a few small and well-defined areas. So far as known at the 

 present time there are only three such areas within the State, and they 

 are quite widely separated. In the State of Oregon there are also 

 such infestations, with a very large stretch of country between those in 



*NoTE. — A species of peacli borer has also been taken from Napa County. As the 

 insects were still in the larval stage it could not be determined at that time whether 

 this was the C^alifornia peach borer, JEgcria opalescens, or the eastern peach borer, 

 .^yeria exitiosa. — Editor. 



