Even the number of Apis species changes number pretty regularly. 

> In my ' Catalogue of the Apidae' I enumerated fifteen species
> of the genus Apis: one was overlooked at that time, and four I
> have described since its publication, thus increasing the number
> to twenty species.

On the species and Varieties of the Honey-Bees belonging to the genus Apis
Frederick Smith. The Annals and Magazine of Natural History, 1865 


> Maa’s classification of honeybees (1953) was based mainly on the morphological
> analysis of single bees. He divided the genus Apis into three genera with two
> subgenera and 24 species.


> Our third biological example uses mitochondrial
> sequences and concerns relationships between six species
> of Apis (honeybee) that are thought to have diverged
> over the past 40-50 Myr.


Recovering Evolutionary Trees under a More Realistic Model of Sequence Evolution. 
Peter J. Lockhart, Mol. Biol. Evol. 11(4):605-6 12. 1994.


> We review the literature for studies that investigated
> paternity within honey bee colonies, and we report the
> average paternity numbers and effective paternity frequencies
> of eight species of Apis.


A scientific note on the revised estimates of effective paternity frequency in Apis
D. R. Tarpy. Insect. Soc. 51 (2004) 203–204


> we present the analyses of the currently recognised species of Apis: 
> A. andreniformis, A. cerana, A. dorsata, A. florea, A. koschevnikovi,
> A. laboriosa, A. mellifera, A. nigrocincta

Sarah E. Radloff, H.R. Hepburn 2011

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