Species within the genus Eurema range from Asia, Africa, Australia, and Oceania, to the Americas. 
At least 71 species are currently known. 
The main differences between the species are:
a) the number of spots in the underside forewing cell, combined with
b) the shape of the upperside forewing black markings and
c) the shape of the apical area markings on the forewing underside. 

Eurema albula, sometimes also called the Ghost Yellow, is a butterfly in the family Pieridae.
This is a rather small butterfly (30–50 mm) with rounded wings.
It is white above with a black border along the outer margin (tip) of the forewings, and also on the hindwing in males.
The underside is usually white, but may be slightly yellowish (particularly at the base of the wings).
It is found from southern Texas (rare) south through the West Indies and mainland tropical Central and South America to Brazil.
Its habitat consists of tropical forests and second growth.

This is the subspecies Eurema albula celata which occurs in Mexico and south to Honduras.

The photo in the middle shows it together with the much bigger Glutophrissa drusilla tenuis.

Andrew Neild, author of The Butterflies of Venezuela and a recognized authority on Neotropical butterflies, helped me identifying this species.

Los Tarrales Natural Reserve, Patulul, Suchitepequez, Guatemala, 18 January 2020