lyly] CONTENTS. V 



Page. 



Disease of flax due to Colletotrichum, Pethybridge and Lafferty 544 



Curtailing potato diseases, Orton 545 



Cooperative spraying [of potatoes for late blight] in Vermont, Lutman 545 



Is crown gall injurious to apple nursery stock? Fracker 545 



Avocado scab, Stevens 545 



Report of plant pathologist, Stevens 545 



A bacterial disease of citrus 546 



Ustulina sonata on Hevea brasiliensis, Shai'ples 546 



European poplar canker in the vicinity of Philadelphia, Pa., Primm 546 



Daldinia vcniicosa, a pyroxylophilous fungus, Rhoads 546 



ECONOMIC ZOOLOGY — ENTOMOLOGY. 



Tropical wild life in British Guiana, Beebe, Hartley, and Howes 546 



Birds of tield, forest, and park, Gilniore 547 



The bii'ds of North and Middle America, Ridgway 547 



Notes on North American birds, VIII, Oberholser 547 



The migration of North American birds, IX, Oberholser 547 



Birds of a Washington city dooryard, Oberholser 547 



Another purple martin roost in the City of Wasliington, Oberholser 547 



Range, migration, and economic value of bobolink, McAfee 547 



Eumyias v. Stoporala, Oberholser 547 



The status of the subfamily name Fuligulinse, Oberholser 547 



The geographic races of Hedymeles ntelanocepJialus, Oberholser 547 



A revision of the subspecies of Passerculus rostratus, Oberholser 547 



Passerhcrhvlus leconteii becomes Passerhcrlnduf< caudacutus, Oberholser_ 547 



Proper orthography of generic name Phoethornis Swainson, Oberholser 547 



Descriptions of nine new Noi'th American pikas, Howell 547 



The family name of the American wood warblers, Oberholser 548 



A dangerous snail introduced in California, Gorton 548 



Report of entomologist, Watson 548 



Unusual nursery insects, Weiss 549 



Insects of the season 549 



Report of the entomologist, Fullaway 549 



Insect and arachnid pests of 1917, Macdougall 549 



Division of entomology, annual report, 1916-17, Lounsbury 549 



Economic entomology, Tryon .549 



Common insects and diseases of the apple. Chase . .549 



More important insect enemies of the rose mallow in New Jersey, Weiss_ 549 



Insect pests of stored grains and mill products, Lathrop ,549 



Insecticides and fungicides, Shutt 549 



Adulteration of insect powder with daisy flowers, Roark and Keenan 550 



Fumigation with liquid liydrocyanic acid, Quayle 550 



Liquid hydrocyanic gas for fumigation 551 



The treatment of cloth to prevent mildew, Morrill and Yothers 551 



The care of spraying machinery, Yothers 551 



Two new genera and thirteen new species of Thysanoptera, Hood 551 



Some plant bugs that infest citrus trees, Froggatt .551 



The genus Phatnoma, Gibson .551 



The genera Corythaica StSl and Dolichocysta Champion, Gibson 551 



Notes on the North American .species of Corizus, Gibson 551 



Cicadula sc.rnotata, injurious to wlieat, oats, and barley, Ellinger 551 



Third contribution to the knowledge of Italian Coccidse, Leonardi 551 



An interesting reaction to louse bites, Moore 551 



Clinical studies on effects of louse bites, Hirschfelder and Moore 551 



The biology of Pediculus humamis, Nuttall 552 



Report on typhus conditions in native dwellings, Brain 5.52 



Notes on the tussock moth in British Columbia, Anderson 5.52 



The European corn borer, Houser 552 



The history of the codling moth in British Columbia, Treherne 552 



Differences in pink bollworm and Pyroderces simplex, Averna-Sacca 552 



Physiological and parasitological studies of Lepidoptera, Gautier 5.52 



Coceobacilli parasites of the caterpillar of Pieris brassicce, Paillot 552 



Argentine fruit fly {Annstrepha fratercvivs), Caride Massini and Brethes- 552 



Black flg fly and its parasites in Sorrento peninsula, Italy, Savastano 5.52 



The maize leaf miner (Phytoniyza sp.), Knowles 553 



Lonchcea aristella, injurious to caprifig and fig, Silvestri 553 



