title: Seasonal occurrence of the primary and secondary screwworm (Diptera: Calliphoridae) in the Pacific coastal area of Chiapas, Mexico during 1978-1979.
mesh_terms: D000818:Animals; D004175:Diptera / Q000502:physiology*; D004463:Ecology; D005260:Female; D008297:Male; D008800:Mexico; D012621:Seasons; D012756:Sheep / Q000469:parasitology