Pacific Cicada-killer Wasp

Pronunciation

How to pronounce Sphecius convallis: //ˈspiː.si.əs kɔnˈvæ.lɪs//

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Summary

Sphecius convallis, commonly known as the Pacific cicada killer, is a sand wasp with specific identification traits that distinguish it from closely related species. It plays a role in the ecosystem as both a predator of cicadas and as a pollinator.

Physical Characteristics

In females: Punctation density in the middle of T2 is less dense compared to T1. In males: Antennal segments II-IV are not curved ventrally, making them appear more tube-like.

Identification Tips

Females typically have less extensive yellow markings not exceeding T4, while yellow markings on males and females of S. grandis often exceed T4. Antennal segments II-IV in males appear more tube-like compared to the bead-like appearance in S. grandis.

Habitat

Prefers sandy soils where it can burrow to nest.

Distribution

Found from the western United States to western Texas, including states such as Arizona, California, Colorado, Idaho, New Mexico, Nevada, Oregon, Texas, Utah, and Washington, as well as western Mexico.

Diet

Primarily preys on cicadas, utilizing them as food for their larvae.

Life Cycle

The female wasp constructs a burrow in sandy soil where she provisions it with cicadas for her larvae.

Reproduction

Reproductively active throughout the summer months; females will mate and begin nesting after fertilization.

Ecosystem Role

Acts as a predator by controlling cicada populations and is a pollinator of some plants.

Collecting Methods

• Pitfall traps
• Net collecting during flight periods

Preservation Methods

• Pinning (for dried specimens)
• Alcohol preservation (for molecular studies)

Similar Taxa

• Sphecius grandis

Tags

• wasp
• cicada killer
• Sphecius convallis