NEW YORK EXPERIMENT STATION BULLETIN 391 



EXPLA.NATiON OF PLATES. 



Plate I.— Fig. 1, the oyster-shell bark-louse, natural size; 2, view of under surface of some of 

 the scales showing eggs, enlarged; 3, photomicrograph of some of the eggs: 4. scurfy bark-louse, 

 natural size : .5, plum lecanium, a, enlarged, b, natural size : 6, the oak scale, natural size. 



Plate II.— Fig. 1, the oyster-shell bark-louse; a, adult male; b, foot of same; c, young larva: d, 

 antenna of same; e, adult female taken from scale— a, c. e, greatly enlarged: b. d. still more 

 enlar^'^ed. 



Fig. 2, the San Jos6 scale, adult female before development of eggs; a, ventral view, showing 

 very long sucking setas ; b, anal plate, showing characteristic ornamentation of edge— greatly 

 enlarged. 



(L. O. Howard and C. L. Marlatt, United States Department of Agriculture. Division of 

 Entomology.) 



Plate III.— The San Jos6 scale; Fig. 1, infested pear | Duchess d' Angouleme] : 2, portion of the 

 pear enlarged showing scales about four times natural size: 3, infested pear twig, natural size: 4, 

 section of same, enlarged. 



Plate IV.— Small house for fumigating nursery stock. 



Plate v.— The woolly louse of the apple. Fig. 1, infested apple twig, natural size: 2. section of 

 the same twig enlarged showing gall and lice; 3, roots of young apple showing galls made by the 

 lice ; 4, some of the galls, natural size ; 5, scar on ti-unk of young apple tree in which lice have 

 congregated. 



Plate VI.— Fig. l. plum root showing work of peach tree borer: 2. a, pupa case with chrysalis 

 emerging : b and c, male and female moths ; 3, larva, two views. | Fig. 2, natural size : Fig. 3 

 slightly enlarged. From photographs, by Mr. F. A. Sirrine.] 4, pistol-case-bearers hibernating on 

 apple twig, natural size; .5, plant lice, IlaylopteruA jyruni, on under surface of plum leaf, enlarged; 

 6, young apple leaves drawn together by larva of bud moth. 



