The main online resource currently is the WTaxa species catalogue by Miguel Alonso-Zarazaga and Chris Lyal , based on their 1999 catalogue of family and genus group names, with a large number of unchecked species names added. This can be accessed through these pages. http://wtaxa.csic.es/
An additional resource is the Index of Organism Names, ION, based on Zoological Record, which can be accessed here (http://www.organismnames.com/).
Names and unique identifiers for those names can also be retrieved from uBio (http://www.ubio.org/).
The International Code of Zoological Nomenclature. The Code dictated how we handle nomenclatural issues. It can now be found online at http://www.iczn.org/iczn/index.jsp Other aspects of the work of the International Commission on Zoological Nomenclature, which oversees the Code, can be found at http://www.iczn.org/
ZooBank is the developing registry of Zoological names, created by the ICZN. It will function as a Zoological Nomenclator. More information can be found at http://www.zoobank.org/
Nikolai Yunakov's Entiminae catalogue. This is available through SpeciesFile (select 'Curculionoidea Database from the drop-down search list and enter the taxon you are seeking in the box above) and Catalogue of Life