This journal contains field notes documenting Richard Blackwelder's research in Puerto Rico, Saint Thomas, Guadeloupe, and Trinidad from 18 September 1935 to 26 December 1935 to study insects, especially beetles. This journal contains 122 pages. Blackwelder also travels to Saint Kitte, Saint Croix, Antigua, Dominica, Martinique, Saint Lucia, and Barbadoes during this trip, but does not seem to collect at those locations. Blackwelder provides descriptions of flora and fauna, especially birds, of his surrounding environment. He also includes elevations, weather information, and other observations. Abundance of insect genera is noted when applicable. Also, description on how specimens were obtained (ex. in cow dung; rotten fruit) is included. Maps for Puerto Rico, Guadeloupe, and Trinidad are included and are annotated to show locations of stations and route taken. Stations visited include station 43-130 (43-64 Puerto Rico, 66-68 Saint Thomas, 69-91 Guadeloupe, 92-130 Trinidad). Index of locations is included in the back. Index of insects is also included. Sketches of plants are included in the back. Examples of localities Blackwelder visited includes Ciales and Olinpo (Puerto Rico); Grande-Terre (Guadeloupe); and Sans Souci and La Brea (Trinidad).