Melissodes agilis

Cresson, 1879

agile long-horned bee, agile longhorn bee

Melissodes agilis is a of long-horned in the , characterized by the notably long of males. The species exhibits striking in : females are solitary ground-nesters, while males form nightly sleeping on flowers and vegetation. Males are highly territorial, aggressively defending floral resources from other including and bees. The species is to North and Central America and has been documented in urban pollinator gardens.

Melissodes agilis by (c) Amy Schnebelin, some rights reserved (CC BY), uploaded by Amy Schnebelin. Used under a CC-BY license.

Melissodes agilis male by Jacy Lucier. Used under a CC BY-SA 4.0 license.

Melissodes agilis female by Jacy Lucier. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Melissodes agilis: /mɛˈlɪs.oʊˌdiːz əˈdʒɪlɪs/

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

Identification

Males are readily identified by their elongated and distinctive sleeping —clustering on flower or stems at night. Territorial males exhibit aggressive patterns, dive-bombing intruders on flowers. Females may be distinguished from other Melissodes by nest entrance characteristics: round holes approximately pencil-diameter with small soil resembling miniature volcanoes. Close examination of morphological features is required to separate from such as Melissodes robustior and from the related Svastra obliqua.

Images

Appearance

Males possess exceptionally long , the namesake trait of the Melissodes. is pronounced: males have modified hind legs lacking pollen-carrying structures, while females possess for pollen transport. Body coloration typically features pale or yellowish markings on a dark background. Size is moderate among .

Habitat

Urban and suburban gardens, open meadows, and areas with abundant flowering plants. Males select elevated, exposed perches for sleeping , including lavender stems, guara, and Mexican sunflower (Tithonia rotundifolia). Females require bare or sparsely vegetated ground for nesting burrows. suitability is determined primarily by floral resource availability rather than proximity to female nesting sites.

Distribution

North America and Central America. Documented observations span from northern to southern California and throughout the western United States. GBIF records confirm presence in Middle America and North America.

Seasonality

Active during warm months when floral resources are abundant. Males begin arriving at sleeping around sunset (approximately 5 p.m.), remaining until morning departure. Activity patterns are influenced by temperature and light conditions; cool or drizzly weather may delay or modify sleeping aggregation .

Diet

floral visitor, documented foraging on Mexican sunflower (Tithonia rotundifolia), lavender, guara, and catmint (Nepeta). Pollen and nectar are collected by females; males visit flowers primarily for nectar and territorial perches.

Life Cycle

Females are solitary ground-nesters, each excavating individual burrows. Nesting holes are approximately pencil-diameter with small soil . Males do not participate in nest construction or provisioning. Developmental stages include , , , and ; specific details are not documented in available sources.

Behavior

Males exhibit three distinctive behaviors: (1) nightly sleeping on elevated vegetation, with jostling for position during settlement; (2) highly territorial defense of floral resources, including dive-bombing attacks on , , , and other visitors; (3) morning departure from sleeping sites once disturbed by foraging activity of other . Sleeping aggregations typically form around 5–7 p.m. and persist until 7–10 a.m. or later. Males cannot ; females possess but are not aggressive.

Ecological Role

of diverse flowering plants in urban and natural . Male territorial may influence floral among pollinator . Ground-nesting females contribute to soil aeration and through burrow excavation.

Human Relevance

Valuable in residential and commercial gardens. Male sleeping provide accessible observation opportunities for naturalists and photographers. Non-stinging males pose no threat to humans. Frequently featured in pollinator garden educational materials and outreach. Misidentification with occurs among non-.

Similar Taxa

Melissodes robustiorSimilar male sleeping on Tithonia; requires expert examination for reliable separation
Svastra obliquaClosely related with males also forming sleeping on flowers; distinguished by morphological details of and leg structure
Apis melliferaNon- frequently found in same ; lacks long male and sleeping ; often targeted by territorial M. agilis males

Misconceptions

Non- frequently misidentify this as a . The 'long-horned bee' refers to , not horns. Male sleeping are sometimes mistaken for swarming or nest activity; they are instead roosting unrelated to or colony formation.

More Details

Sleeping Site Dynamics

Males have been observed shifting sleeping locations from lavender to guara, possibly in response to presence (), floral , or improved height advantage for predator avoidance.

Conservation Context

Documented in UC Berkeley Urban Lab research as part of California's 1600+ bee , highlighting importance of urban gardens for native bee .