Perigonia passerina 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 Bolivia

Bolivia

Bolivia officially known as Plurinational State of Bolivia , is a landlocked country in central South America. It is the poorest country in South America...

, Argentina

Argentina

Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

 and Brazil

Brazil

Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

.

It is similar to Perigonia lusca lusca

Perigonia lusca

The Half-Blind Sphinx or Coffee Sphinx is a moth of the Sphingidae family. It found from the northern tip of South America, through most of Central America, and up to Florida in the United States....

, but the median part of the forewing outer margin is more convex. The forewing upperside ground colour is more grey. Furthermore, the yellow patch along the inner margin of the hindwing upperside is much larger and the tornal patch on the hindwing underside is buff.

Adults have been recorded in July and December in Bolivia, suggesting there are two generations per year.