ILLUSTRATIONS 



PLATES 



Studies on Capacities OS Soils for Irrigation Water, and on a New 

 Method of Determining Volume Weight 



Plate i. A.— Apparatus used for the determination of the volume weight of page 

 soils in place by the rubber-tube method. B. — Apparatus used for the 

 determination of the volume weight of soils in place by the paraffin- 

 immersion method 36 



Some Stoneflies Inju-rious to Vegetation 



Plate 2. Tcsniopteryx pacifica: A. — Young peach leaves and blossoms injured 



by stonefly. B, C. — Adult stoneflies feeding on peach buds 42 



Plate 3. TcBniopteryx pacifica: A. — Cherry foliage injured by stoneflies. B. — 

 Partly grouTi peaches, showing injuries caused by stoneflies. C. — Nymph, 

 cast nymphal skin, and adult stonefly 43 



Plate 4. Tceniopteryx pacifica: A..- — Stonefly. B. — Mandibles, ventral view. 

 Right mandible at reader's left. C. — Ventral view of anal segment of 

 female. D. — Labium. E. — Maxilla. F. — Labrum. Dorsal view at left, 

 ventral view at right 42 



Further Notes on Laspeyresia Molesta 



Plate 5. Laspeyresia molesta: A. — Peach twig showing summer injury. B. — 

 Peach twig with mass of gum, leaves, and frass; a type of injury found in 

 fall and winter 72 



Plate 6. Laspeyresia molesta: A. — A green peach attacked by the caterpillar, , 



illustrating a common type of injury. B. — A quince severely injiired .... 72 



Plate 7. Laspeyresia molesta. A. — Typical injury by larva on apple, resem- 

 bling that caused hy Laspeyresia prunivora. B. — Injury to the interior of 

 the fruit 72 



Plates. A. — Laspeyresia molesta: Head capsule of larva from side. B. — 

 Laspeyresia molesta: Head capsule of larva from front. C. — Laspeyresia 

 molesta: Head capsule of larva from beneath. D. — Laspeyresia m.olesta: 

 Diagram showing arrangement of body setas on segments. E. — Laspey- 

 resia pomonella: Chart showing arrangement of body setas on segments. 

 F. — Laspeyresia molesta: Ventral view of anal prolegs and caudal end of 

 abdomen. AF, anal fork; Cr, crochets. G. — Laspeyresia pomonella: 

 Ventral view of anal prolegs and caudal end of abdomen. Cr, crochets; 

 SP, scobinated pad 72 



Plate 9. Laspeyresia molesta: A. — Larva. B. — Egg. C, D, and E- — Pupa, 



dorsal, lateral, and ventral views 72 



Plate 10. Laspeyresia molesta: A. — Adult. B. — Metathoracic leg. C. — ^Head 



and mouth parts 72 



(V) 



