The spider is similar to the related Mexcala agilis and Mexcala elegans, but can be distinguished by the wider tibial apophysis on the male palpal bulb and the presence of two heavily sclerotised shallow depressions in the female epigyne.

Mexcala monstrata is a jumping spider that was first described by Wanda Wesołowska and Antonius van Harten in 1994.

[2] They allocated the species to the genus Mexcala, first raised by George and Elizabeth Peckham in 1902.

[3] The genus was a member of the tribe Heliophaninae alongside Pseudicius and Cosmophasis, which was absorbed into Chrysillini by Wayne Maddison in 2015.

It is orange with a stripe across the middle and brown edges, and covered with dense short scale-like hairs that seem to cling to the body.

The tibial apophysis, or appendage, is short and thick, with a distinctive sharp tip.

The oval epigyne is heavily sclerotised and has two shallow depressions plugged with a waxy secretion and ridged with round grooves.

[12][13] Two copulatory openings lead via relatively short but complicated seminal ducts to medium-sized receptacles.

It is related to Mexcala elegans, but the male can be distinguished by its wider tibial apophysis.

[13] The male can also be differentiated from Mexcala agilis by way its tibial apophysis has an abruptly pointed tip in comparison to the gently narrowing end of the other species.

[17] Like other jumping spiders, it is mainly a diurnal hunter that uses its good eyesight to spot its prey.

[19] It uses visual displays during courtship and transmits vibratory signals through silk to communicate to other spiders.