Online resources, assisted by search engines, provide unmatched convenience for text-based searching. Here are some useful online resources for butterfly identification:
在搜尋系統之輔助下，網上資源提供了非常方便的文字搜尋。以下是一些辨別蝴蝶時相當有用的線上資源：
Lepidoptera and some other life forms
by FUNET
FUNET is the Finnish University and Research Network. It is a comprehensive and easy-to-use database. It is rather up-to-date in terms of the scientific names. Information such as geographical distribution is very helpful in identification of butterflies.
FUNET是芬蘭大學及研究網絡的簡稱。它提供了全面而又易用的資料庫。在更新學名上算是頗快。有關物種及其亞種的地理分佈資訊，對於辨蝶有相當的幫助。
http://ftp.funet.fi/index/Tree_of_life/insecta/lepidoptera/ditrysia/papilionoidea/index.html
http://ftp.funet.fi/index/Tree_of_life/insecta/lepidoptera/ditrysia/hesperioidea/index.html
The Global Lepidoptera Names Index
by Natural History Museum
Formerly known as British Museum (Natural History), Natural History Museum in London is one of the most important reference. The online database appeared to offer comprehensive list of butterfly species. However, most of the information was not kept in this database and many fields were left blanked. Anyway, it is still a reference for tracking valid scientific names.
位於倫敦的自然歷史博物館，前身為大英博物館的自然歷史部分，是最重要的參考資源之下。其網上資料庫擁有最齊全的蝴蝶物種清單。然而，大部分的資料都沒有被放在網上資料庫內。無論如何，它仍是目前搜尋有效學名的最佳參考之一。
http://www.nhm.ac.uk/research-curation/research/projects/lepindex/search/index.dsml
A Check List of Butterflies in Indo-China
by Y.Inayoshi
Mr Yutaka Inayoshi is a well known lepidopterist from Japan. He spent long time in Indo-China. Inayoshi contributed a lot to the great reference book “Butterflies of Thailand 2nd Edition”. His web site is certainly a good reference too.
Yutaka Inayoshi乃知名的日本鱗翅目學家。他花了不少時間於中南半島地區。他對參考書《泰國蝴蝶第二版》有相當的貢獻。他的網站理所當然地是極佳的參考資源。
A Synonymic List of Lycaenidae (Lepidoptera) from the Philippines
by Yusuke Takanami & Yasuo Seki
Apart from the books by Mr Bernard d’Abrera, there is not much resources about butterflies in the Philippines. This web site is one of the few free online resources that can work as a compliment to the books by d’Abrera.
在Bernard d’Abrera的圖書以外，有關菲律賓蝴蝶的資源不多。此網站是少數有關菲律賓蝴蝶的免費資源，可視為d’Abrera著作的補充資料。
http://www.asahi-net.or.jp/~EY4Y-TKNM/frontp.html
ButterflyCircle Checklist (Singapore Checklist)
It offers comprehensive coverage of butterflies in Singapore. This is one of the best organized online resources. Apart from photos of mature butterflies, the complete life cycle was also shown.
此網頁提供全面的新加坡蝴蝶資訊。這可謂是組織的最好的網上資源之一。除了成蟲的照片外，連同蝴蝶的生命週期圖片也有提供。
http://checklist.butterflycircle.com
Rhopalocera Ngiana 延陵蝶類志
It is part of Fauna Ngiana under Acta Scientrium Ngensis. The collection includes mainly specimens gathered in Hong Kong. The collection is not huge, but the quality of the plate photos are generally better than many publications.
這是廷陵科學綜合室網站中廷陵動物誌的一部分。其收錄的標本多於香港搜集。其收藏不算龐大，不過其標本照片的質素比很多書籍都來得好。
http://www.ngensis.com/butt.htm
Learn about Butterflies
by Adrian Hoskins / learnaboutbutterflies.com
Mr Adrian Hoskins is an entomologist from UK. According to the about-page, his photo collection has covered over 2700 species.
Adrian Hoskins是一個來自英國的昆蟲學家。根據他的自我介紹，他的收藏包括了近2700種的蝴蝶。
http://www.learnaboutbutterflies.com/index.htm
Butterflies of America
by Butterflies of America Foundation
The web site covered a huge collection of North and South America butterflies.
此網頁收錄了龐大的南北美蝴蝶紀錄。