4 MOSQUITOES OF NORTH AMERICA 
Salvador, Sonsonate, and Izalco in the Republic of Salvador ; Champerico and 
San José in Guatemala; Puntarenas, Santo Domingo, San José and Port Limon 
in Costa Rica; and Corinto, Nicaragua. Mr. Knab collected a large amount of 
valuable material, and one important result of this work was to show that the 
yellow-fever mosquito occurs at every point visited on the Pacific coast. While 
it could be assumed that this would be the case, there had, up to that time, been 
no authentic record of the fact. 
At the same time that Mr. Knab started for Central America, Mr. August 
Busck, of the Department of Agriculture, was sent to the West Indies, sailing 
from New York on June 1. He visited Grenada, Trinidad, Tobago Island, St. 
Vincent, Barbados, Martinique, Dominica, Guadeloupe, St. Thomas, Santo 
Domingo (Santo Domingo City, San Francisco Mountains and Samara Bay), 
returning to Washington early in October, having collected and bred a very ex- 
tensive series of mosquitoes and having aroused the interest of a number of local 
observers, who subsequently were of much assistance in the investigation. 
Early in the summer Mr. A. N. Caudell was sent to Florida to work out the 
life history of a species not yet fully known, and in the spring Dr. Dyar and Mr. 
Knab went to western New England to study carefully the as yet little under- 
stood spring and early summer mosquitoes of that region. During midsummer 
Dr. Dyar visited the Adirondacks to work out some hitherto unknown points in 
the life histories of certain species inhabiting that region. 
Early in June, while engaged upon another investigation, the grantee visited 
the Natural History Museum in Vienna to study the mosquito types of Wiede- 
mann, in the Wiedemann and Winthem collections. He took with him from the 
United States determined material of several species about which there existed 
some doubt as to their identity with the Wiedemann types, and cleared up 
several points of systematic importance. Returning to this country in the early 
autumn he was able to give many points of value in quarantine measures to the 
Public Health and Marine-Hospital Service, and in late October visited New 
Orleans and observed the operations of the closing days of the campaign against 
the yellow fever, which proved so successful, making notes on the methods used 
against the yellow-fever mosquito and taking photographs. 
During 1906 Dr. Dyar made extensive observations upon the Pacific coast of 
the United States, stopping first at Bright Angel Camp in Arizona, and then 
proceeding gradually from San Diego northward through California, Oregon, 
and Washington into British Columbia, stopping a sufficient length of time at 
favorable localities to make the requisite observations and rearings. The trip 
was begun in April and the final observations were made August 26. 
Considerable additional material was received from volunteer assistants dur- 
ing the year, and especially from Mr. F. W. Urich, of Trinidad, British West 
Indies. The main portion of the year was devoted to preparation of descrip- 
tions and illustrations and general work on the monograph. The intended ex- 
pedition for the study of the mosquitoes of Alaska was, however, not made. 
In 1907 the paucity of material from the Panama Canal Zone was very 
obvious as contrasted with the abundant material from other Tegions, and, 
