Signs or indications

Larger diameter cells; capped brood dome-shaped extending above cell limit. Adults barrel shaped abdomenabdomen:
the segmented, posterior (third) part of the bee body that contains heart, honey, stomach, intestines, Malphigian tubules, reproductive organs, and sting
, frequently not stripped like worker abdomenabdomen:
the segmented, posterior (third) part of the bee body that contains heart, honey, stomach, intestines, Malphigian tubules, reproductive organs, and sting
 with large eyes meeting at top of head.

Description

Drones, the male adult bee, develop from unfertilized eggs laid by queens is cells slightly larger in diameter compared to worker cells (drone cells = 4 per linear inch; worker cells = 5 cells per linear inch). Their main function is the fertilization of a virgin queen bee. The male chromosome cell condition is haploid (1n). Drones take, on average, 24 days to develop from egg to emerged adult, compared to 21 days for the worker.

Drone brood starts as unfertilized eggs (3 days), then eggs mold into drone larva(e) for 6-7 daysy before they are cappedcapping:
the covering that bees add over comb cells containing fully ripened honey or to cap brood that has reached the pupal stage; bee bread cells are not capped
(cappedcapping:
the covering that bees add over comb cells containing fully ripened honey or to cap brood that has reached the pupal stage; bee bread cells are not capped
drone brood).This pupal stage of drone brood initially exhibits white eyes and then eye color passes to pinkish and finally to purple colored eyes before the eyes become black.Pupa stage last 14 days on average.

CappedCapping:
the covering that bees add over comb cells containing fully ripened honey or to cap brood that has reached the pupal stage; bee bread cells are not capped
drone cells are readily distinguished from worker cappedcapping:
the covering that bees add over comb cells containing fully ripened honey or to cap brood that has reached the pupal stage; bee bread cells are not capped
cells because they are larger and dome-shaped, extending 1/3 - 3/8 inches outward from the comb face; cappedcapping:
the covering that bees add over comb cells containing fully ripened honey or to cap brood that has reached the pupal stage; bee bread cells are not capped
worker cells are only very slighly domed at the comb surface. 

Drone adult bodies are robust, their abdomenabdomen:
the segmented, posterior (third) part of the bee body that contains heart, honey, stomach, intestines, Malphigian tubules, reproductive organs, and sting
is rounded (not tapered) they have large eyes that meet at top of their head. They have one additional antennal segment, compared to workers.

Female varroa mites "prefer" drone brood and have greater reproduction success of 2-3 mature daughters (compared to one mature daughter when reproduction occurs in a worker cell). There are means to encourage drone brood and then remove the brood at cappingcapping:
the covering that bees add over comb cells containing fully ripened honey or to cap brood that has reached the pupal stage; bee bread cells are not capped
stage (droen brood removal) as a trapping mechanism to reduce mite population buildup in the spring colony.

Using worker foundaiton limits the production of drone brood - which normally only occurs during spring buildup - in managed colonies. Feral colonies raise more drones.

In the hive, drones are most commonly encountered on edge of brood sphere. They fly in afteroon hours for mating. (see mating flight). Colonies will frequently expel adult drones with cooling weather in the fall. (See fall drone removal)

Most closely resembles

Drones brood and adults easily distinquished from adult workers or queens. mating flights

Resources

BuzzaboutBees. 2021 update Drone bee. https://www.buzzaboutbees.net/dronebee.html

Carolina Bees. 2021. Bee brood. https://carolinahoneybees.com/bee-brood/

Perfect bee. 2019. The role of the drone bee. https://www.perfectbee.com/learn-about-bees/the-life-of-bees/role-of-the-drone-bee

HBHC. 20182022. Using drone brood removal for varroa control. https://www.youtube.com/watch?v=j17AStzxEgs

Snyder, Rob, 2913, Neglected drone brood. BeeInformed. https://beeinformed.org/2013/07/25/neglected-drone-brood/

Beekeeping Insider https://beekeepinginsider.com/the-three-different-types-of-honey-bees-in-a-hive/

Perfect Bee. https://www.perfectbee.com/learn-about-bees/the-life-of-bees/role-of-the-drone-bee#:~:text=In%20the%20fall%2C%20when%20foraging%20becomes%20scarce%2C%20drones,entrance%20and%20throw%20them%20out%20of%20the%20hive.

Delaplane, 2019. Biology of individual Honey Bees. Bee Health. https://bee-health.extension.org/biology-of-individual-honey-bees/?msclkid=c3cb798ccfcc11ecb5773b5bfd6f1e2d