Species Cyclocephala longula
Synopsis of the cyclocephaline scarab beetles (Coleoptera, Scarabaeidae, Dynastinae)By Matthew R. Moore, Ronald D. Cave, Marc D. Branham
ZooKeys 745: 1-99, 2018
The species of Scarabaeidae (Coleoptera) associated with sugarcane in south FloridaBy R.D. Gordon and D.M. Anderson
The Florida Entomologist, 64 (1): 119-138 , 1981
"Those species of Scarabaeidae known to be associated with sugarcane in the Lake Okeechobee area of Florida are discussed and delineated. The species are: Phyllophaga latifrons (LeConte), Anomala marginata (F.), Cyclocephala parallela Casey, Dyscinetus morator (F.), Ligyrus subtropicus (Blatchley), and Euphoria sepulchralis (F.). Descriptions and illustrations of the larvae of all these species are presented as well as descriptions and illustrations of the adults of all species except Euphoria sepulchralis (F.). A key to the south Florida species of the genus Cyclocephala is also included."
The Scarab Beetles of FloridaBy Robert Woodruff
Florida Department of Agriculture and Consumer Services, 1973
Full title: Arthropods of Florida and Neighboring Land Areas. Volume 8. The Scarab Beetles of Florida (Coleoptera: Scarabaeidae). Part I. The Laparosticti (Subfamilies: Scarabaeinae, Aphodiinae, Hybosorinae, Ochodaeinae, Geotrupinae, Acanthocerinae). Part II covers May Beetles (Phyllophaga).
Has black-and-white photos. Apparently out of print, but still available from some suppliers--see comments. Also available on-line:
Link updated 7 February 2012--thanks for the comments!
The Scarabaeoid beetles of San Diego County, California. Part I. Introduction...By McPeak R.H., Oberbauer T.A.
Proceedings of the San Diego Society of Natural History 40: 1-24, 2008
Full title: The Scarabaeoid beetles of San Diego County, California. Part I. Introduction and diagnosis of families Glaresidae, Trogidae, Pleocomidae, Geotrupidae, Ochodaeidae, Hybosoridae, and Glaphyridae