Who described a species found in a country that borders Guyana?
Mapeta xanthomelas: Mapeta xanthomelas is a species of snout moth, and the type species in the genus "Mapeta". Mapeta xanthomelas:  It was described by Walker in 1863, and is known from Guatemala and Venezuela. Venezuela: Venezuela ( ; ] ), officially the Bolivarian Republic of Venezuela (Spanish: "República Bolivariana de Venezuela" ), is a federal republic located on the northern coast of South America. Venezuela:  It is bordered by Colombia on the west, Brazil on the south, Guyana on the east, the Dutch Caribbean ABC islands to the north and the islands of Trinidad and Tobago to the north-east.
Walker