Lepidoptera Survey


Date of this Version


Document Type



Taxonomic Report of the International Lepidoptera Survey (April 22, 2022) 10(2): 1-20

Also available at https://lepsurvey.carolinanature.com/ttr/ttr-10-2.pdf

Also available at the Internet Archive, the Biodiversity Heritage Library, and Zobodat


Copyright 2022, the International Lepidoptera Survey. Open access material

License: Creative Commons Attribution-ShareAlike-NonCommercial 4.0 International (CC BY-SA-NC 4.0 International)


New natural history elements and distribution records of several North American butterflies are reported. While diversity and distribution of butterflies in the eastern United States is commonly believed to be fully known, the findings presented here show that much is yet to be learned of our butterfly fauna.


1. Pages 1-9

Celastrina ladon and C. neglecta (Lycaenidae: Polyommatinae) Are Distinct Species Differentiated Primarily by a Diagnostic Wing Scale Structure, Voltinism, and Host Tolerance of Cornus florida.by Harry Pavulaan (International Lepidoptera Survey)

Abstract. With continued confusion of the two species by naturalists, Celastrina neglecta (W. H. Edwards) is here clarified as a distinct species, not a form or subspecies of fully sympatric C. ladon (Cramer). Each is characterized by distinct physiological characteristics, phenology, voltinism, host tolerance, and distribution. C. ladon is an obligate univoltine taxon, appearing in a single springtime flight throughout its range limited to the eastern United States, while C. neglecta produces multiple late-winter through early-fall broods over a much broader range, and may be represented by localized ecotypes or biotypes. C. ladon is distinguished from all other blue Celastrina species primarily by the presence of a unique male forewing scale structure found in no other Celastrina except for dorsally-black C. nigra.

2. Pages 9-10

A Rare Case of Mosaic Gynandromorphism in the Zabulon Skipper (Lon zabulon) (Boisduval & Le Conte[1837]) (Hesperiidae) by Annette Allor (Maryland Butterflies)

Abstract. On August 15, 2021, I found an odd, yet beautiful example of a Zabulon Skipper in Elkridge, Howard County, Maryland (off the Morning Choice Trail), not far from the Rockburn Branch stream. After later investigations and subsequent emails, it turns out that this Zabulon Skipper may be the only North American Skipper ever documented with mosaic gynandromorphism.

3. Pages 11-20

Rhode Island, USA Fall Lepidoptera Survey 2021 by Harry Pavulaan

Abstract. The first TILS-sponsored survey to document lepidoptera near season’s end in Rhode Island was conducted September 18 to October 10. The goal was to document southward migrants as well as northward migrants, and also the presence and abundance of resident late season broods in the Ocean State. Unfortunately, due to the COVID-19 pandemic, participation was dampened, but several participants provided a good window to what was flying.