THE BLACK FLY OF CITRUS. 
Indies in 1918, Morrison did not find this pest in Barbados, Grenada, 
Tobago, Trinidad, or British Guiana. The British entomologists of 
these regions are fully acquainted with this insect and are carefully 
Fig. 2.— Distribution of the black fly in the West Indies. 
watching for it. Therefore it is safe to assume that the black fly 
does not occur there at the present time. In his trip to the Virgin 
Islands in 1917, Morrison did not find it at any places visited by him 
Fig. 3.— Distribution of the black fly in Cuba. 
on the islands of St. Croix, St. John, or St. Thomas. Neither did he 
find it in Porto Rico in his inspections that year. 
In 1919, Zetek (37) records for the first time the occurrence of the 
black fly in Costa Rica, having found it in the vicinity of Limon 
and as far inland as Peralta, on the Northern Railroad. 
The maps show the distribution of the black fly in the world (fig. 1), 
in the West Indies (fig. 2), and in Cuba (fig. 3). 
