Brachys rileyi

Brachys rileyi can be distinguished from other Brachys species by its association with Quercus gambelii at high elevations in the Sacramento Mountains region of New Mexico and adjacent west Texas. The species has metallic blue coloration with a narrowed reddish elytral apex, resembling in general form other Brachys species but separable by geographic distribution and host specificity. It is most similar to Brachys barberi, which occurs on Quercus havardii in sand dune habitats at lower elevations, and Brachys ovatus, an eastern species not found in this region.

High-elevation alpine meadows and oak-juniper-pine woodlands, specifically associated with Quercus gambelii (Gambel's oak). Occurs at elevations above 8000 feet in the Sacramento Mountains of New Mexico. The habitat features open expanses with large patches of mature Gambel's oak interspersed with coniferous forest.

Known from the Sacramento Mountains in southeastern New Mexico (Otero County, specifically near Cloudcroft) and adjacent mountain ranges in west Texas. The type locality and all confirmed records are from high-elevation sites in this region.

Adults are active in late spring to early summer. Field observations indicate emergence is tied to oak leaf flush, with adults appearing when Gambel's oak foliage is newly expanded. At 8000+ feet elevation, this typically occurs in late May to early June, later than lower elevation sites due to cooler temperatures at altitude.

• Quercus gambelii - larval hostGambel's oak; the sole documented host plant. Adults have been collected by sweeping foliage of this oak species.

Adults are collected by sweeping the foliage of Gambel's oak, particularly the high branch tips in the canopy. They are not known to visit flowers. The species appears to be associated with fresh oak foliage, suggesting adults may feed on newly expanded leaves.

• Brachys barberiSimilar size, coloration, and general morphology, but occurs on Quercus havardii (shin oak) in sand dune habitats at lower elevations; does not overlap in habitat or host plant with B. rileyi
• Brachys ovatusEastern species with similar appearance but completely allopatric distribution; not found in New Mexico or west Texas
• Brachys querciOccurs on Quercus grisea (gray oak) and other oaks in Arizona and New Mexico mountains, but at different elevations and on different oak species; distinguishable by host association and geography

• Buprestidae
• jewel beetle
• oak-associated
• high elevation
• New Mexico endemic
• recently described

• BugGuide
• iNaturalist taxon
• Scathophagidae | Beetles In The Bush
• 2022 Six-State Insect Collecting Trip iReport | Beetles In The Bush