Protambulyx sulphurea is a species of 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 northern and south-western Venezuela

Venezuela

Venezuela , officially called the Bolivarian Republic of Venezuela , is a tropical country on the northern coast of South America. It borders Colombia to the west, Guyana to the east, and Brazil to the south...

 and 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...

.

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 about 110 mm. Adults are similar to Protambulyx ockendeni

Protambulyx ockendeni

Protambulyx ockendeni is a species of moth of the Sphingidae family. It is known from Peru and much of Central America and South America. It has also been recorded in Bolivia.The wingspan is 105-110 mm...

but the wings are narrower and paler and the pattern is less contrasting. Furthermore, the forewing upperside is lacking the large costal patches and subbasal patch on the inner margin and the marginal band on the forewing underside is much narrower. The hindwing upperside is lemon yellow.

Adults are probably on wing year round.