Callionima grisescens 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,...

, which is known from 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...

, Paraguay

Paraguay

Paraguay , officially the Republic of Paraguay , is a landlocked country in South America. It is bordered by Argentina to the south and southwest, Brazil to the east and northeast, and Bolivia to the northwest. Paraguay lies on both banks of the Paraguay River, which runs through the center of the...

, 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...

 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 was originally described by Rothschild as Calliomma grisescens, in 1894.

Adults probably fly in multiple generations. In Bolivia, adults have been found from May to December, from November to December in Argentina. They are dimorphic. The forewing ground colour is pale bluish-grey or orange-brown, the latter somewhat resembling small specimens of Callionima calliomenae

Callionima calliomenae

Callionima calliomenae is a moth of the Sphingidae family. It is known from Venezuela, Haiti and the Dominican Republic.The wingspan is about 67 mm...

. The apex of the forewing is pointed. The outer margin is not dentate or with only a vestigial teeth which is slightly concave below apex. The forewing upperside has a black (often indistinct) median band crossing the wing just basal to the narrow transversely oriented silver spots. The hindwing upperside is very similar to Callionima parce

Callionima parce

The Parce Sphinx Moth is a species of moth in the family Sphingidae, which is known from Argentina, Venezuela, Suriname, French Guiana, Bolivia, Brazil, Peru to Belize, Guatemala, Nicaragua, Costa Rica, Panama and Mexico to southern Florida, southern Texas, southern Arizona and southern California...

, the black and white anal patch is heavy, the space around it grey.

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