Genus Chionomus, Fennah 1971
Two of these species are known from both North (Neotropics) and South America, one is only known from South America.
Type species (in original combination): Delphacodes havanae Muir and Giffard, 1924.
There are three recognized species in this genus:
Chionomus havanae (Muir and Giffard, 1924) -
USA: Florida, Puerto Rico; Cayman Is. (Grand Cayman); Cuba; Jamaica; Guatemala; Guyana; Trinidad; Venezuela; Panama
Chionomus balboae (Muir and Giffard, 1924) - USA: Florida, Puerto Rico; Brazil; Argentina; Mexico; Ecuador; Guyana; Paraguay; St. Lucia; Venezuela
Chionomus haywardi (Muir, 1929) - Argentina, Uruguay, Chile
Chionomus haywardi has been recorded on:
Oryza sativa L. (Rice)
Zea mays L. (Corn)
Triticum aestivum L. (Common Wheat)
Avena sativa L. (Common Oats)
Hordeum vulgare L. (Common Barley)
Names of plants from USDA PLANTS database.
Economic Importance: Chionomus haywardi is known to vector Mal Rio de Cuarto virus (MRCV) (Velazquez et al. 2003).
When Fennah erected this genus in 1971 he utilized the meeting of the submedian carinae at the apex of the head, combined with a white pronotum and scutellum, reduced processes, and a dark spot near the clavus. Additionally, these species share a distinctly projecting armature of the diaphragm, parameres with the broad basal angles and a concave inner margin, and a tubular aedeagus.
Chionomus havanae - brachypterous male
Chionomus havanae - macropterous male
Chionomus havanae - frons and pygofer
Chionomus balboae - brachypterous male
Chionomus balboae - macropterous male
Chionomus balboae - frons
Muir F. A. G. & Giffard W. M. 1924. Studies in North American Delphacidae. Bulletin. Hawaiian Sugar Planters' Association Experiment Station. Division of Entomology. Honolulu 15: 1-53.
Muir, F. 1929. New and little known South American Delphacidae (Homoptera-Fulgoroidea) in the collection of the British Museum. Annals and Magazine Natural History 10 (3):75-85.
Velazquez, P. D., J. P. Arneodo, F. A. Guzman, L. R. Conci and G. A. Truol. 2003. Delphacodes haywardi Muir, a new natural vector of Mal de Rio Cuarto virus in Argentina. Journal of Phytopathology 151: 669-672.