Name of issue: Nature of America - Sonoran Desert
Number of arachnid related stamps in issue: 0/10 (souvenir sheet)
Even though there are no arachnid stamps in this series, they get their own acknowledgement on the back of the sheet. Also note the tarantula hawk wasp (Hemipesis hustulata)!
Aphonopelma chalcodes Chamberlin, 1940
Centruroides exilicauda (Wood, 1863)