Cerceris occipitomaculata

Packard, 1866

Cerceris occipitomaculata is a solitary ground-nesting in the Crabronidae. Like other members of the Cerceris, it is a that captures and paralyzes prey to provision underground nests for its offspring. The is distributed across North America and Middle America. As with , it likely exhibits prey specialization, though specific prey records for this species are not well documented in the available sources.

Pronunciation

How to pronounce Cerceris occipitomaculata: /sɛrˈsɛrɪs ɒkˌsɪpɪtoʊˌmækjəˈleɪtə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Habitat

Sandy or sandy-clay soils in open, sunny areas such as ball fields, dirt roads, playgrounds, and campsites. Nests are typically found in lightly vegetated, well-packed soil rather than heavy clay or regularly groomed surfaces.

Distribution

North America and Middle America. Records indicate presence in both regions, though specific locality data beyond generic labels such as "St. Louis" and "Columbia" for related are sparse.

Behavior

Solitary dig underground nests with pencil-sized circular entrances surrounded by symmetrical mounds of fine-textured diggings. Females hunt for prey, paralyze it with their sting, and transport it back to the nest. Multiple prey items may be cached in a single nest. Wasps may drop prey when threatened and abandon it rather than retrieve it. Nest entrances can be temporarily blocked to intercept returning wasps carrying prey.

Ecological Role

of other insects. As a hunter, likely contributes to of its prey . May serve as for velvet ants (Mutillidae).

Human Relevance

Member of a used for biosurveillance of pests, particularly the emerald ash borer (Agrilus planipennis), though C. occipitomaculata itself is not specifically documented for this purpose. Related in the genus have been utilized by citizen science programs such as WaspWatchers to detect forest pests.

Similar Taxa

Cerceris fumipennisAlso a ground-nesting Cerceris with nearly identical burrow architecture. Distinguished by prey type: C. fumipennis specializes almost exclusively on Buprestidae (jewel beetles), while other Cerceris species prey on different insect groups such as weevils (C. bicornis) or other beetles. Prey items found around nest entrances provide the most reliable distinguishing character.
Cerceris bicornisAnother sympatric Cerceris that makes nearly identical burrows. Burrow entrances may appear slightly larger on average, and the species exhibits faster, more powerful . Most reliably distinguished by presence of weevils rather than buprestids around nest entrances.
Bembix americanaSand wasp with superficially similar burrows, but burrows enter ground at an angle rather than straight down, diggings are asymmetrically distributed, and burrows are consistently in sandier portions of fields. No beetles are found around entrances.
Cicindelidia punctulataTiger larval burrows lack diggings around entrance, are slightly smaller (about 5 mm diameter), have a subtle D-shaped entrance with beveling around the rim where the larva rests its jaws. Cerceris nests lack these features.