I893-] 



BLISTER MITES 



249 



then I should indeed be very thankful to avail myself of 

 your kind permission to ask for further information, and 

 a sketch would be a most valuable aid. I have top great 

 a respect for the time and work of scientific men to intrude 

 if I can possibly help it, and I am very grateful for the 

 important help which you have already given me. 



2b 



i, female (natural length circa 0*2 mm.) ; 2a, left leg of the first pair 

 of Phytoptus tristriatus, and 26, of Phytoptus tristriatns var. carinea, 

 magnified 550 times all after Dr. Nalepa. 3, infested pear leaf. 



FIG. 64. PEAR LEAF BLISTER MITE, PHYTOPTUS PYRI. 



November 2, 1893. 



I am greatly obliged for your kind letter received two 

 days ago, and it is so very good of you to have taken the 

 trouble of writing the names of the various portions of the 

 Phytoptus on your plate accompanying so clearly for me 

 that I hardly know how to express my thanks sufficiently. 



