Help:What are these AGAPxxx identifiers and where are the old ENSANGxxx IDs

From VectorBase Help System

From genebuild 4, VectorBase stable identifiers for genes, transcripts and proteins are used instead of Ensembl-style identifiers. All VB identifiers for Anopheles gambiae begin with the 4 letters AGAP. The same numeric value is used for a gene and all its products. Alternate products of a single gene have suffixes ending A, B, C etc.

More details can be found about the AgamP3.4 gene build here and there is also further practical guidance for conversion between identifiers available.