CONTENTS. 



Department Bulletin No. 826. — Generic Classification of the Hemip- 



terous Family Aphididae: Page. 



Superfamily Aphidoidea 2 



Phylogeny of the Aphididae 3 



Key to the subfamilies of the Aphididae 10 



Subfamily I, Aphidinae 10 



Subfamily II, Mindarinae 61 



Subfamily III, Eriosomatinae 62 



Subfamily IV, Hormaphidinae 81 



Genera not placed 88 



Index to genera 91 



Department Bulletin No. 827. — The Cut-over Pine Lands of the South 

 for Beef-cattle Production: 



Extent of the cut-over lands 2 



Survey of the cut-over lands 5 



Objects and plan of procedure 5 



Status of the beef -cattle industry 6 



Number and value of cattle 6 



Size and quality of cattle 8 



Work accomplished in improving native cattle 11 



Native cattle for foundation herds 12 



Adaptation of cut-over lands for beef cattle 13 



Climate 14 



Area in farms and grazing lands 14 



Soils and topography 15 



Ownership of lands and size of holdings 16 



Improvement of cattle 19 



Pastures 20 



Winter feeds 34 



Concentrated feeds 38 



Silage crops 42 



Recommendations for winter feeding 43 



Buildings and shelter 46 



Diseases and pests 47 



Water supply *. 48 



Markets 49 



Experimental work of immediate importance 49 



Department Bulletin No. 828. — Bacterial Wilt of Cucurbits: 



Foreword 1 



Summer transmission of wilt 2 



Winter transmission of wilt 16 



Relation of the wilt bacteria to cucumber beetles 21 



Virulence tests 25 



Some host relations 31 



Distribution of bacterial wilt . . 34 



Control 36 



Summary 41 



Department Bulletin No. 829. — The Mosaic Disease of Sugar Cane and 

 Other Grasses: 



History of the disease 1 



Distribution in the United States 4 



Losses in the United States 7 



Primary symptoms 8 



3 



