Light traps are used frequently in insect surveys, and there is need for a detailed catalog of the species known to be attracted to light. No comprehensive list has been published. Slingerland, in 1902, published a paper listing approximately 200 species attracted to kerosene lanterns. Since then, the use of incandescent and ultraviolet lamps has greatly changed the picture. A report by the U. S. Department of Agriculture (1961), summarizes much of what is known concerning the attraction of insects to light traps. The present paper lists many species not reported previously from light traps and includes new records for Florida and the United States. The occurrence of common species often extends their known distribution. Four new species have been described wholly or in part from material taken during this study-a tipulid fly, Limnophila frosti Alexander; and three Lepidoptera, Rhyacionia subtropica Miller, Argyrotcaenia kimballi Obratsov, and Rhododipsa fulleri McElvare. Various specialists have retained a great deal of material, which promises to yield many new species and records for Florida. Among this material, eight orders are prominent: Neuroptera (Myrmelionidae), Psocoptera (Psocidae), Thysanoptera (Hoplandrothrips), Coleoptera (especially Staphylinidae), Homoptera (Delphacidae and Cicadellidae), Hemiptera (Miridae), Diptera (Tendipedidae, Ceratopogonidae, and Otitidae), and Hymenoptera (Braconidae, Ichneumonidae, and Tenthredinidae). The insects were taken at standard Pennsylvania insect light traps with black light fluorescent lamps (Frost 1957). These were operated in the same location from 1 November to 1 April during the winters of 1958 to 1960 and from 1 January to 1 April during 1961 to 1963. The details of making collections and the various conditions under which the traps were operated have been published (Frost 1962, 1963). Since all the insects were taken at the same location, little detail is necessary except the dates of collections and their relative abundance. The abundance of the species is designated as follows: When less than ten specimens were collected, the months and days are given as 11/6 (Nov. 6), 12/2 (Dec. 2), etc. When more than ten specimens were collected, only the months are given as, 11, 12, 1, 2, 3 and 4. Abbreviations are also used to indicate relative abundance: SC (somewhat common), when 10 to 25 specimens were collected; (C), when 25 to 100 specimens were collected; and VC, when more than 100 specimens were collected. The specialists who cooperated in making identifications are listed with the groups they identified. A few remarks concerning the determination of this material seem advisable. Most of the species were identified by