Gyascutus planicosta cribriceps

Distinguished from related Gyascutus species by the combination of elytral sculpture and coloration pattern characteristic of the nominate subspecies planicosta, with subspecific distinction based on pronotal and elytral punctation density (cribriceps = 'sieve-headed,' referring to dense punctation). Larger than most North American buprestids; adults may exceed 20 mm in length. Separated from Hippomelas proper by the flatter, less convex body form and different elytral sculpturing. The related Gyascutus caelatus occurs further south in Arizona and Mexico, while G. fulgidus overlaps in range but differs in coloration and surface texture.

Arid and semi-arid regions of the southwestern United States; associated with riparian corridors and washes where host plants grow. Collected from willow (Salix) and other woody vegetation in desert scrub and grassland environments. Occurs at lower to middle elevations in areas with adequate moisture to support host plant growth.

Southwestern United States (western Texas, southern New Mexico, southeastern Arizona) and northern Mexico. Records from Chihuahuan and Sonoran Desert regions. The subspecies appears to be more western in distribution compared to other forms of G. planicosta.

Adult activity recorded from July through August; peak emergence likely coincides with summer monsoon rains and host plant flowering.

Larvae develop in living or recently dead wood of host plants, specifically willow (Salix spp.) and possibly other woody plants in the family Salicaceae or related riparian species. Adults feed on foliage or may take nectar; specific adult diet poorly documented.

• Salix - larval hostwillow
• Prosopis glandulosa - adult associationmesquite; adults observed resting or feeding

Holometabolous with wood-boring larvae. Larvae tunnel in sapwood and heartwood of host trees, likely requiring one or more years to develop. Pupation occurs in wood; adults emerge through circular exit holes. Newly emerged adults may retain a pale waxy bloom that rubs off with activity.

Adults are strong fliers and can be observed flying rapidly between host plants or taking evasive flight when disturbed. Readily takes flight when approached; collected by tracking flight paths to landing sites or by beating host vegetation. Nocturnal activity at lights has not been documented for this species.

Larval wood-boring contributes to nutrient cycling in riparian ecosystems; may serve as prey for woodpeckers and other insectivores. Adults may function as pollinators when feeding on flowers.

Of interest to coleopterists and natural historians due to large size and striking appearance. Not considered an economic pest. Specimens sought by collectors; can be difficult to obtain due to flighty behavior and specific habitat requirements.

• Gyascutus caelatusOverlaps in Arizona; distinguished by brighter metallic green or blue coloration and more strongly convex body form
• Gyascutus fulgidusSympatric in parts of range; differs in coloration and elytral sculpturing, often more bronzy or coppery
• Hippomelas sphenicusFormerly placed in same genus; distinguished by more convex body, different elytral striation, and typically more southerly distribution
• Gyascutus planicosta planicostaNominate subspecies; differs in pronotal and elytral punctation density, with cribriceps having denser, more cribriform (sieve-like) punctation

• Buprestidae
• jewel beetle
• wood-borer
• southwestern US
• willow
• riparian
• Gyascutus
• subspecies

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life
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