Sphecodes dichrous

Smith, 1853

Blood Bee

Sphecodes dichrous is a of cleptoparasitic in the Halictidae, commonly known as a blood bee. Like other members of the Sphecodes, females lay their in the nests of other solitary bees, primarily sweat bees (Halictus and Lasioglossum species). The larvae consume the 's pollen provisions and parasitize the host larvae. The species has been recorded in North America, including Vermont.

Pronunciation

How to pronounce Sphecodes dichrous: //ˈsfɛkoʊdiːz ˈdaɪkroʊəs//

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Identification

Sphecodes dichrous can be distinguished from other Sphecodes by specific morphological features, though detailed diagnostic characters require examination. The species is part of a taxonomically challenging where identification often relies on subtle differences in punctation, wing venation, and male genitalia. It may be confused with other cleptoparasitic bees such as Nomada species (nomad bees) or Triepeolus species, but Sphecodes typically has a more slender petiole and different antennal proportions. Confirmation of species identity generally requires examination by a specialist in Halictidae.

Appearance

are typically slender-waisted with a -like appearance, characteristic of the Sphecodes. The specific epithet "dichrous" (meaning "two-colored") suggests a distinctive color pattern, though precise markings for this are not detailed in available sources. Females have a pointed adapted for depositing in nests. The "blood " refers to the often reddish or blood-red coloration seen in many Sphecodes species.

Habitat

Found in environments where sweat bees nest. As a , its is defined by the presence of suitable host , which typically nest in ground burrows in sunny, well-drained soils. The species has been recorded in Vermont, suggesting for temperate North American conditions.

Distribution

Recorded in North America; specifically documented as present in Vermont, United States. The full extent of its range within North America is not comprehensively detailed in available sources.

Diet

feed on nectar from flowers. Larvae are cleptoparasitic, consuming pollen and nectar provisions collected by bees, and ultimately feeding on the host larvae themselves.

Host Associations

Halictus - mining bees, typical for Sphecodes
Lasioglossum - sweat bees, typical for Sphecodes

Life Cycle

Females locate nests of sweat bees, enter when the host is absent, and deposit in . The Sphecodes larva hatches before or shortly after the host egg/larva, consumes the pollen provision, and kills and consumes the host larva. Development completes within the host cell, with emerging the following season.

Behavior

Females exhibit nest-searching , hovering low to ground to detect nest entrances. They may enter host nests stealthily when hosts are away foraging. Some Sphecodes have been observed using forceful entry, killing defending host bees when necessary.

Ecological Role

Acts as a ( ) on solitary sweat bees. Functions as a regulator of . Contributes to complexity in bee . may provide minor pollination services through nectar feeding.

Human Relevance

No direct economic importance to humans. Like other native bees, contributes to overall diversity and function. May be encountered by watchers and naturalists in suitable .

Similar Taxa

Sphecodes albilabrisAnother Sphecodes with similar cleptoparasitic lifestyle and -like appearance; distinguished by specific morphological details and geographic range
Nomada goodenianaSimilar yellow-and-black -mimic appearance and cleptoparasitic habit, but Nomada parasitizes Andrena mining bees rather than sweat bees, and has different body proportions with less pronounced petiole constriction
TriepeolusSimilar cuckoo bee and -like appearance, but in Apidae rather than Halictidae; Triepeolus parasitize digger bees (Anthophorini)

More Details

Taxonomic note

The was described by Frederick Smith in 1853. The Sphecodes is taxonomically complex with many similar species, and species-level identification often requires detailed examination of microscopic characters.

Observation data

The iNaturalist platform records 147 observations for this , indicating it is documented by citizen scientists but not among the most commonly observed native bees.