Taxonomic Outlines

Systema Naturae 2000 (Family, 9 Apr 2017)

Websites

Butterflies and Moths of the World: Generic Names and their Type-species.
The Global Lepidoptera Names Index
Try Wikipedia
Try Wikispecies

General Search Engines

Bing (Images)
Google (Images, Books, Scholar)
Yahoo! (Images)

Scientific Search Engines & Libraries

Biodiversity Heritage Library (BHL)
Canada Institute for Scientific and Technical Information (CISTI)
Entrez, The Life Sciences Search Engine (NCBI)
Index to Organism Names (ION)
PubMed (NCBI)
ZooBank

Additional links

How to Grow your own Butterfly Garden