Parancistrocerus perennis
(de Saussure, 1857)
two-banded mason wasp, perennial mason wasp
Parancistrocerus perennis, commonly known as the two-banded or mason wasp, is a small solitary in the Eumeninae. It is to eastern North America, ranging from southern Ontario to Florida and west to the Mississippi River. The is a cavity-nesting that hunts specific to provision its nests. Two are recognized: P. p. perennis and P. p. anacardivora, the latter occurring in southern and distinguished by reddish markings.
Pronunciation
How to pronounce Parancistrocerus perennis: /ˌpærənˌsɪstɹəˈsɛɹəs pəˈɹɛnɪs/
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Identification
This is challenging to identify from photographs alone and is often confused with Stenodynerus species. Confirmation typically requires examination of collected specimens under a microscope. The anacardivora can be recognized by reddish markings on the first abdominal . Specimens found west of the Mississippi River are likely misidentifications, as the species has only been confirmed as far west as Kansas.
Images
Habitat
Inhabits areas with access to pre-existing cavities for nesting, including hollow twigs, old borings in dead wood, and artificial blocks. Associated with supporting its and nectar sources for feeding. Found in both natural woodland edges and suburban gardens where suitable nesting substrates and floral resources are available.
Distribution
Eastern North America, from southern Ontario south to Florida, and west to the Mississippi River. The Parancistrocerus perennis anacardivora occurs in the southern portion of the range. Westernmost confirmed record is from Kansas.
Seasonality
Active primarily in late summer and early fall. Observations include October in New Jersey and late June in Colorado, suggesting extended period across its range. have been documented nectaring on wildflowers including boneset, rattlesnake master, and goldenrod .
Diet
feed on nectar from wildflowers. Females hunt of the () and ( ) to provision nests. The caterpillars are paralyzed with the 's and serve as living food for developing .
Host Associations
- Coleophoridae - used as larval provisions
- Tortricidae - used as larval provisions
Life Cycle
Solitary nesting . The female uses pre-existing tunnels such as hollow twigs or borings, dividing them into multiple constructed from the bottom up. Each cell is provisioned with several paralyzed , after which a single is laid on the last victim. The cell is sealed with a partition of sand glued together with saliva. The is repeated until the tunnel is filled. develop on the provided caterpillars, with presumably one per year in temperate regions.
Behavior
Females are active hunters that seek out concealed in rolled leaves or protective cases. They demonstrate persistent foraging despite the defensive strategies of their , including the 'bungee jump' escape response of caterpillars. regularly visit flowers for nectar. The readily adopts artificial nesting substrates such as drilled wooden blocks or bundled sumac twigs.
Ecological Role
of in the and , potentially providing of these herbivorous . As a cavity-nesting , it contributes to the of organisms utilizing dead wood and standing stems. Serves as for parasitic in the family .
Human Relevance
Can be attracted to artificial blocks and nesting structures, providing opportunities for observation and study. Non-aggressive toward humans; are used only for capture and defense. May contribute to natural suppression of pests in gardens and natural areas.
Similar Taxa
- StenodynerusExtremely similar in size, coloration, and patterning; often impossible to distinguish from P. perennis in images of live specimens. Microscopic examination of collected specimens typically required for separation.
- Euodynerus hidalgoAnother cavity-nesting that utilizes artificial nesting tubes; distinguished by different color patterns and larger size.
More Details
Subspecies
Two are recognized: Parancistrocerus perennis perennis (nominate form) and Parancistrocerus perennis anacardivora (Rohwer, 1915). The latter occurs in southern and is characterized by reddish markings on the first abdominal .
Nesting preferences
Sumac (Rhus) twigs are specifically mentioned as a preferred natural nesting substrate. Artificial nests should include holes of appropriate diameter and be placed in south-facing, sheltered locations at least three feet above ground.