I bought several of these corys a while back, they were being sold as C. Punctatus (I knew at the time they were not, because of the black mask).
I have looked in my book and the closest looking cory to them is "C.Brevirostris" please could somebody confirm this for me as I'm not 100% sure, and there are lot's of others that look similar IMO.
![Image](http://i707.photobucket.com/albums/ww73/gskinner3705/Cory1_zpscdebeac9.jpg)
Cheer's...PanzerFodder...