Moved to new species page.

ID'd with the help of Phillip Harpootlian. Punctate elytral striae exclude G. semiopacus. G. blackburnii and G. splendidus have the sutural striae ending at the scutelum as compared to G. hornii and G. balyi which have their sutural striae bend and wrap around the scutelum. Also, the medial impressed pronotal line of hornii and balyi tends to be more pronounced than in the other members of the genus although this feature is not so obvious in this photo. Finally, the antennal clubs of hornii and balyi tend to be light brown as opposed to dark brown or black. Hornii differs from balyi in that balyi always has some blue, green, or purple iridescence while hornii is pure anthracite black.