There are about 300 species of butterflies that have been recorded in the Lower Rio Grande Valley (LRGV) of South Texas. About one half of these same species are LRGV specialties that do not normally occur elsewhere in the United States. A phenomenal 50% of these specialties are " unique" and not found north of this region.
Total Unique Species: 86
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Primarily compiled from: Atlas of Western USA Butterflies, Including Adjacent Parts of Canada and
Mexico Ray E. Stanford and Paul A.
Opler. 1993.
Denver and Fort Collins. Privately Printed.
English names follow:
Cassie et al. NABA Checklist and English Names of North American Butterflies. Second Edition. 2001
