ILLUSTRATIONS. 9 
Page. 
Fig. 35. Aphidencyrtus aphidiphagus: Adult 127 
36. Pachyneuron sp. : Adult 127 
37. Allotria sp. : Male, female antenna 128 
38. The convergent lady-beetle (Hippodamia convergens) : Adult, larva, 
pupa 129 
39. The nine-spotted lady-beetle (Coccinella 9-notata): Adult 129 
40. The nine-spotted lady-beetle (Coccinella 9-notatd): Full-grown larva. 129 
41. The spotted lady-beetle (Megilla maculata): Adult, larva, pupa 130 
42. A South African lady-beetle, Adalia flavomaculata 130 
43. Syrphus americanus: Adult female and details of male 131 
44. Eupeodes volucris: Adult female and details of male 131 
45. Sphxrophoria cylindrical Adult female and details of male 132 
46. The golden-eyed lacewing fly (Chrysopa oculata) : Adult and details, 
eggs, larvae, cocoon 133 
47. Aphidoletes sp., a cecidomyiid fly enemy of the spring grain-aphis 134 
48. Aphidoletes sp., a cecidomyiid larva which attacks the spring grain- 
aphis 135 
DIAGRAMS. 
Diagram I. Maps of the United States east of the Rocky Mountains, showing 
normal temperature and departure therefrom for the critical 
period December, 1881, to May, 1882 15 
II. Maps of the United States east of the Rocky Mountains, showing 
normal temperature and departure therefrom for the critical 
period December, 1889, to May, 1890 21 
III. Maps of the United States east of the Rocky Mountains, showing 
normal temperature and departure therefrom for the critical 
period December, 1900, to May, 1901 25 
IV. Maps of the United States east of the Rocky Mountains, showing 
normal temperature and departure therefrom for the critical 
period December, 1902, to May, 1903 26 
V. Maps of the United States east of the Rocky Mountains, showing 
normal temperature and departure therefrom for the critical 
period December, 1906, to May, 1907 28 
