On a private collecting trip to the Netherlands Antilles, in the winter of 1948—1949, I had the opportunity of studying an infestation of the sapodilla, caused by a well-known kind of fruitfly, Anastrepha serpentina, which, however, has never before been reported from these islands. The identification was kindly confirmed by E. McC. Callan, Imperial College of Tropical Agriculture, Trinidad; specimens were compared by him with material named by A. Stone, deposited with the collections of the I.C.T.A. My grateful thanks are due to the Department of Agriculture of the Netherlands Antilles for giving a financial support which made entomological work possible, and especially to Agricultural Superintendent B. A. Bitter, for putting at my disposal the facilities of the Agricultural and Experimental Gardens at Cas Corá.