Perhaps this paper (in German) has the answer:

Röll, B. (2004). Lygodactylus luteopicturatus Pasteur, 1965 [1964]: ein Synonym von Lygodactylus picturatus (Peters, 1870)(Sauria, Gekkonidae). Sauria, Berlin, 25(1), 33-37.

Best regards!

Dear Alfonso,

thank you very much for perfect answer and your kind help :)

Best regards,

Radomir

Dear researchers, any one will help me in explaining the praying mantis taxonomy and bio-diversity related issues

Radomir,

I think this CITES guide is all you need: 

https://cites.unia.es/cites/file.php/1/files/how_to_identify_lygodactylus.pdf

Dear Mikhail,

Thank you for email and guide. I already knew this CITES guide, unfortunately it is not very actual and in my opinion it should be revised as some taxonomical changes were made since it was published (and one of them including taxonomy of L. picturartus).

Best regards,

Radomir

Than I do not understand the reason you are asking question... sorry (Roll's paper is evident and the difference shown in CITES guide). 

Another recent papers dealing with their taxonomy: http://www.mapress.com/j/zt/article/view/zootaxa.4061.4.6

and

http://docslide.us/documents/multigene-phylogenetic-analysis-of-lygodactylus-dwarf-geckos-squamata-gekkonidae.html

Maybe this will helps you.

Dear Mikhail,

Thank you for links to both papers.

According to the key included in the CITES guide please note that Lygodactylus picturatus and L. luteopicturatus are marked there as separate species. With no knowledge about paper by B. Roll (2004), provided above by our colleague Alfonso Balmori, I was a little confused if it is one or two separate species. And that is the reason of my question and asking for help.

Regards,

Radomir