https://bugguide.net/node/view/653439

http://www.suan-yong.com/photos.php?s=Moths&k=5098

http://dpr.ncparks.gov/moths/view.php?MONA_number=7854.00

https://bugguide.net/node/view/1086159

http://www.butterfly.ontarioinsects.org/ontbutterflyatlas/MothSQL.php?type=recordsAd&sp=one&area=regions&order=calDayDesc&spIndex=60&areaID=3&areaName=Forest%20Region%20of%20Great%20Lakes%20-%20St.%20

https://www.inaturalist.org/taxa/116682-Hemaris-gracilis

https://www.butterfliesandmoths.org/species/Hemaris-gracilis

http://www.silkmoths.bizland.com/Sphinx/hgracilis.htm

http://www.silkmoths.bizland.com/Sphinx/hgracilis.htm