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Checkered Beetles (Family Cleridae)

It kind of looks like Enoclerus longipes (confirmed obs in Yucatan): https://www.inaturalist.org/taxa/555744-Enoclerus-longipes

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NOT

Hoplomutilla uncifera are arthropods in the Velvet Ants (Mutillidae) family. Body is black with 2 large orange spots on top of abdomen. Face, legs, and thorax are covered with gray hairs. The term Velvet Ant is a misnomer, because Velvet Ants are actually hairy WASPS, not ants!

"Mutillidae are a family of more than 7,000 species of WASPS whose wingless females resemble large, hairy ants. Their common name velvet ant refers to their resemblance to an ant, and their dense pile of hair, which most often is bright scarlet or orange, but may also be black, white, silver, or gold. Their bright colors serve as aposematic signals. They are known for their extremely painful stings." https://www.inaturalist.org/taxa/48511-Mutillidae

Link to 2 confirmed look-alike observations nearby: https://www.inaturalist.org/observations/20836830 and https://www.inaturalist.org/observations/36913911

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Beetle Anatomy: simple diagram of external parts: https://animalcorner.org/beetle-anatomy/

Field Guide to California Insects, by Kip Will, J. Gross, D. Rubinoff , J. Powell, 2nd ed., 2020,
Beetles (Order Coleoptera), pp. 189-266.
"Beetles make up the largest Order in the Animal kingdom, in terms of the number of known species. (Next largest are Lepidoptera, Hymenoptera, and Diptera). Many beetles eat living plants and their larvae are found on or in flowers, fruits, leaves, stems, or roots. There are at least 8,000 species of beetles in California and 23,000+ in North America, with many awaiting discovery."

BugGuide: Arthropods: Photos of Insects, Spiders & Their Kin (US & Canada), clickable categories or use search bar (scientific name): https://bugguide.net/node/view/3/bgpage

Cucujiform Beetles (Infraorder Cucujiformia) represent most plant-eating beetles. The infraorder contains 7 SUPERfamilies: https://www.inaturalist.org/taxa/372852-Cucujiformia

Taxonomic Chart of Cucujiform Beetles: https://www.inaturalist.org/taxa/372852-Cucujiformia

Chrysomeloidea (~7 families including longhorn beetles and leaf beetles)
Cleroidea (checkered beetles, bark-gnawing beetles and soft-winged flower beetles)
Coccinelloidea (15 families, includes lady beetles (a.k.a. ladybugs) and fungus beetles)
Cucujoidea (~27 families)
Curculionoidea (~8 families primarily consisting of weevils and also including snout beetles and bark beetles)
Lymexyloidea (ship-timber beetles)
Tenebrionoidea (formerly "Heteromera") (30 families including darkling beetles, blister beetles and ant-like beetles)

Irene's Cucujiform Beetles (Infraorder Cucujiformia) observations on INaturalist: https://www.inaturalist.org/observations?place_id=any&taxon_id=372852&user_id=aparrot1&verifiable=any

Irene's (aparrot1) Profile Page on INaturalist listing Nature Resources (includes online references with links) for Plants, Birds, Fungi, Lepidoptera, Arachnids, Reptiles, Amphibians, Marine Life, Plant Galls, and more: https://www.inaturalist.org/people/3188668