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The last instar larva of Micrathyria paulsoni González-Soriano, 2020 is described and illustrated in detail based on specimens collected in Veracruz State, Mexico. It is compared with the larvae of M. didyma (Selys in Sagra, 1857) and M. hypodidyma Calvert, 1906, all of them belonging into the "Micrathyria didyma" group. The main structural features of M. paulsoni larva are 910 long premental setae plus 45 small setae, palpal setae 10, legs banded, a large, submedian, dark spot on each side of a pale middorsal line on S69, S89 with a posterolateral spine, larger in S9.

The last instar larva of Planiplax sanguiniventris (Calvert, 1907) is described and illustrated in detail based on one specimen collected in the municipality of Tenosique, Tabasco, Mexico. It is compared with the larvae of P. phoenicura Ris, 1912 and a congeneric unidentified species from Colombia. The main structural features are the number of setae on palp and prementum, the size of dorsal protuberance on S3, and the length of posterolateral spines on S89 and caudal appendages.