Callionima gracilis 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...

 in the family 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,...

. It was originally described by Jordan as Hemeroplanes gracilis, in 1923. It is endemic to Cuba

Cuba

The Republic of Cuba is an island nation in the Caribbean. The nation of Cuba consists of the main island of Cuba, the Isla de la Juventud, and several archipelagos. Havana is the largest city in Cuba and the country's capital. Santiago de Cuba is the second largest city...

.

Adults are probably on wing in multiple generations. In size and colour, it is similar to Callionima grisescens

Callionima grisescens

Callionima grisescens is a species of moth in the family Sphingidae, which is known from Argentina, Paraguay, Bolivia and Brazil. It was originally described by Rothschild as Calliomma grisescens, in 1894....

, but with a truncate forewing apex, strongly excavate below, and a larger silver spot on the forewing upperside, clearly divided into two branches. The forewing upperside has the lower branch of the silver spot within a diagnostic ill-defined, longitudinal black band running between the antemedian and submarginal lines through the centre of the wing.

Adults eclose from pupae formed in flimsy cocoons among leaf litter.