Pachygonidia ribbei is a moth

Moth

A moth is an insect closely related to the butterfly, both being of the order Lepidoptera. Moths form the majority of this order; there are thought to be 150,000 to 250,000 different species of moth , with thousands of species yet to be described...

 of the Sphingidae

Sphingidae

Sphingidae is a family of moths , commonly known as hawk moths, sphinx moths and hornworms, that includes about 1,200 species . It is best represented in the tropics but there are species in every region . They are moderate to large in size and are distinguished among moths for their rapid,...

 family. It is known from Peru

Peru

Peru , officially the Republic of Peru , is a country in western South America. It is bordered on the north by Ecuador and Colombia, on the east by Brazil, on the southeast by Bolivia, on the south by Chile, and on the west by the Pacific Ocean....

, Panama

Panama

Panama , officially the Republic of Panama , is the southernmost country of Central America. Situated on the isthmus connecting North and South America, it is bordered by Costa Rica to the northwest, Colombia to the southeast, the Caribbean Sea to the north and the Pacific Ocean to the south. The...

 and Costa Rica

Costa Rica

Costa Rica , officially the Republic of Costa Rica is a multilingual, multiethnic and multicultural country in Central America, bordered by Nicaragua to the north, Panama to the southeast, the Pacific Ocean to the west and the Caribbean Sea to the east....

.

The wingspan

Wingspan

The wingspan of an airplane or a bird, is the distance from one wingtip to the other wingtip. For example, the Boeing 777 has a wingspan of about ; and a Wandering Albatross caught in 1965 had a wingspan of , the official record for a living bird.The term wingspan, more technically extent, is...

 is 56-62 mm. It can be distinguished from all other Pachygonidia

Pachygonidia

Pachygonidia is a genus of moths in the Sphingidae family.-Species:*Pachygonidia caliginosa - *Pachygonidia drucei - *Pachygonidia hopfferi -...

species by the lack of distinct pale bands on the hindwing upperside. There is a distinct and large pale brown submarginal patch on the forewing upperside, as well as diffuse patches of pale violet scales on the median and posterior parts of the wing.

There are probably multiple generations per year.

The larvae feed on Hamelia patens

Hamelia patens

Hamelia patens is a large perennial shrub or small tree in the coffee family, Rubiaceae, that is native to the American subtropics and tropics. Its range extends from Florida in the southern United States to as far south as Argentina...

and Hamelia axilaris. There are green and brown larval forms.