Colletes simulans armatus

Patton, 1879

Eastern Spine-shouldered Cellophane Bee

Colletes simulans armatus is a of polyester bee in the Colletidae, commonly known as the Eastern Spine-shouldered Cellophane Bee. Like other members of the , females construct solitary underground nests lined with a cellophane-like secretion from the . The subspecies occurs in eastern North America and is active in spring. Males emerge before females and engage in competitive mating at nesting .

Pronunciation

How to pronounce Colletes simulans armatus: /koˈlɛ.tɛs ˈsɪmjʊˌlænz ɑrˈmɑːtəs/

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

Identification

Identification to level requires microscopic examination. The Colletes simulans can be distinguished from similar Colletes by the combination of: spine-like projections on the scutellum (giving the 'spine-shouldered' ), and specific wing venation patterns including a sinuous second recurrent in the forewing. Females carry pollen on scopal hairs on the hind legs; males lack these hairs and have longer . The subspecies armatus is differentiated from the nominate subspecies C. s. simulans by subtle morphological characters in the male genitalia and punctation patterns on the .

Habitat

Sandy or well-drained soils with sparse vegetation. Nesting frequently occur in lawns, golf course roughs, parks, and coastal dunes where turf is naturally thin or disturbed. Requires sunny, exposed ground for burrow excavation.

Distribution

Eastern North America. Records include the northeastern United States, with confirmed observations from Vermont and surrounding regions. The occurs within the broader range of Colletes simulans, which extends across eastern North America.

Seasonality

active in spring, typically March through May depending on latitude. Males emerge first (protandry), followed by females. with one per year; larvae develop through summer and fall, as or pupae.

Diet

feed on nectar and pollen from early spring flowering plants. The is polylectic, foraging from multiple plant including trees such as redbud (Cercis) and various spring wildflowers. Larvae consume a semi-liquid provision of nectar and pollen deposited by the female in the .

Life Cycle

Solitary ground-nesting . Each female excavates her own burrow up to 26 cm deep, creating multiple lateral . Cells are lined first with saliva, then with a waterproof polyester secretion from the that dries to a cellophane-like . Each cell receives one and a provision of semi-liquid pollen-nectar mix. Larvae feed, then pupate and overwinter underground. emerge the following spring.

Behavior

Females dig burrows with mouthparts, accompanied by buzzing that may aid soil loosening. Males patrol nesting at ground level, entering burrows to find females and forming competitive mating balls around emerging females. Both sexes are docile and reluctant to sting. Large nesting aggregations can contain hundreds to thousands of individuals in close proximity, though each female maintains a solitary nest. Emits citrus-like odor when handled, produced by a cephalic gland containing linalool and related compounds.

Ecological Role

Important early-spring of flowering trees and herbaceous plants. Nesting contribute to soil aeration and nutrient cycling. Serves as for cleptoparasitic bees and other nest associates.

Human Relevance

Beneficial with no significant negative impacts. Nesting in lawns sometimes cause concern but bees are docile and rarely sting. Turf management practices such as over-seeding and irrigation can reduce nesting suitability if colonies are undesirable. Conservation of nesting sites supports native pollinator .

Similar Taxa

Colletes simulans simulansNominate ; distinguished by male genitalia and tergal punctation patterns, with partially overlapping range in eastern North America.
Andrena spp.Mining bees in Andrenidae share ground-nesting habit and spring activity; distinguished by round (vs. -shaped in Colletes), straight second recurrent wing (vs. sinuous in Colletes), and lack of cellophane-like lining.
Halictus spp. and Lasioglossum spp.Sweat bees in Halictidae can resemble larger Colletes; distinguished by different wing venation, and often by metallic coloration not typical of Colletes.

More Details

Nesting Biology

The cellophane-like lining secreted by females is a unique derived trait of the Colletidae, consisting of a polyester polymer that waterproofs the and preserves the larval food supply.

Pheromone Chemistry

The citrus odor emitted when handled contains linalool and related aromatic compounds from a cephalic gland, possibly functioning in nestmate recognition, mate location, or foraging orientation.