ID,some african cetonidae.

Pic 8
it's seems to be Taurrhina longiceps, maybe with a larger picture...

Ok, I am putting my best guesses forward using both my collection and "Cetoniinae of the World" by Sakai & Nagai. I did the best I could with the pic quality (no criticism meant), no legs showing, no heads really showing, and glare. I may have few of them wrong, but I did have to ID some that were in nearby countries, not just the Tanz. locales. Togo and tanz.(pic 8) are rather far apart, so I had to really guess.

If you could mount them up and do several views of each, I think a better Id-ing would happen. Honestly, I do not know if you are among the collectors who prefer keeping them packaged as opposed to mounting, so please do not take offense.

pic 1 Looks much like Mausoleopsis seillierei.....not sure.
pic 2 Pseudoclinteria infuscata
pic 3 Leucocelis (Oxythyrea) adspersa
pic 4 Genus is perhaps Protaetia or Cetonia(Eucetonia)
pic 6 and 7 Plaesiorrhinella watkinsiana
pic 8 Caelorrhina thoreyi or kolbei --- Togo area
---------or---------C. superba----Tanzania area
Note: With respect to ludovicvignon, I do not see enough anterior head material to go with Taurrhina longiceps, nor do I see any sign of a profemoral spike near the body.
pic 9 is Gnatocera cruda..........and............based on the pronotum marking of pic 10, I'd tend to think it is also G. cruda but maybe an ignita form or the photo had some flash issue with the wrap making it look redder. The mid vertical white line on the pronotum is unique to this species when compared to the other Gnatoceras.
pic 11 & 12 ----can't see enough detail to make a guess
pic 13 is Amazula suavis.

I'd welcome other input to confirm or deny my hypotheses. I am only putting out my best determinations based on what I had to work with. Hope I helped.