Same location as Setaria observation (https://www.inaturalist.org/observations/19559689), Oct 1, 2014, which has been identified as Setaria viridis var. major (Giant Green Foxtail).

CABI (https://www.cabi.org/isc/datasheet/49776) states: S. faberi is more robust than typical S. viridis, and has larger spikelets, 2.5 to 3 mm long, more bristles (2-6 per spikelet) and a larger, nodding inflorescence up to 2 cm wide. It is often confused with S. viridis var. major which also has a nodding inflorescence, but Parochetti (1973) points out that S. faberi has an abundance of short hairs on the upper leaf surface, while S. viridis var. major is only rough to the touch. Also the seed heads of S. faberi are whitish-yellow at maturity while those of S. viridis var. major are reddish-purple. Schreiber and Oliver (1971) provide a useful key and other details for distinguishing the various forms of S. viridis from S. faberi and S. pumila as well as from each other.

Nasal leaf, tail present, no central bump on chin, M W-shaped, tail to mid-UP, 4i subequals, 2x3 pm, ears rounded connected by a band of skin.
According to key provided by Siles & Baker 2019, the only possible choices for our pale-bellied ind. are M. minuta or M. schmidtorum. Then the discriminating character is size of I and p, but there was not known at the moment of the capture. But also, for Morales-Martinez et al (2020), the calcar < feet length is a discriminating character for minuta (calcar > feet for schmidtorum).

1 ind. mist-neted in 1 night at El Triangulo. Complete report on this expedition available on demand.