This hand book, although mainly written by Dr. F.X. Williams, is based upon the work of a number of years of members of the entomological students and might justly be termed the common knowledge of the scholars. This introduction is of a similar nature. A great deal has already been placed on record in a very scattered manner difficult for the individual to get at conveniently, and quite likely to be lost with the changing of the staff unless brought together in a permanent form. When writing for a lay audience it is necessary to deal with entomological subjects some what differently than when writing for entomologists only, and we are fortunate in having in the person of Dr. Williams, one whose knowledge is as accurate as his style is lucid. It is therefore hoped that this handbook will enable many of the field students on the Sugar plantations to recognize the common insects they meet in their daily tasks in the field and become interested in them through a greater knowledge of their activities and utilities.