The Case of a Mysterious Wormy Thing
July 9, 2026

This is the third year in a row that I’ve noticed these seemingly unremarkable-looking brown beetles “hiking” along the rock pile 2-track road. They appear all at once, about mid-June, then vanish after several weeks. This year (2026) these scruffy/fuzzy beetles, know as Lanceolated Chafers (Phyllophaga lanceolata), really caught my attention, especially after finding myself at ground zero of a mass male Flash Mob1 !!! From all directions, determined (and awkwardly) flying male chafers were dodging my legs to land on top of a lone female beetle frantically struggling against an earlier arriving male. His prickly lance-like legs had pinned her to the ground so she was lying on her side unable to use her legs. While she squirmed at my feet, newly landed beetles tried to fling off the original male to claim their rights to the female. Males continued to land until there must’ve been 30 or more, with fights breaking out everywhere, on top of the female and all around my feet. Each male was jousting to be victor.

But a victor of what? Was this some sort of mating ritual? Had the female released highly potent pheromones to attract a mate? If so, how far did her “call” drift on the wind to bring together so many males at one time? Did she intend to call only one male, or was her purpose to entice a stampede? If she anticipated a herd, was her intent to mate with the first one (the fastest?) to arrive? Maybe she hoped for battles and skirmishes to ensue, where the strongest of all males would win her favor(s)? This still remains a mystery, as I couldn’t find anything in the literature to explain this behavior?

While pondering these questions (and daring not to move my feet for fear of squishing one of the many male pile-ups), I bent over for a better look. It was then I noticed an opaque white, worm-like thing slowly emerging from the female’s abdomen! “What could this be?” …..
Was it a larva? Probably not ….. Female chafers don’t give live birth; they lay eggs in the soil beneath their favorite host plants (such as mallows), where they hatch into grubs that remain underground for up to two years before emerging as adult beetles.

Was it part of or the actual female genitalia? Maybe? I’m still searching for information about that notion.
Was it part of the male genitalia that had somehow broken off inside the female during insemination? Is that even possible? Again, still searching for answers about chafer sex.

For another 5 minutes I closely observed the squirming female laying helpless on the ground fighting off numerous suitors while still displaying the wormy “thing.” As more males continued to arrive, crash-landing on other grounded males and adding to the chaos, something changed. Can’t explain what happened, but in a matter of 15 seconds all the males stopped their aggressive fighting and took flight; the female uprighted herself (regaining her dignity?), quickly walking away like the nothing unusual had just happened. I watched her go, noticing she was no longer in possession of the wormy “thing,” and couldn’t find it anywhere at or near the scene!

After-math
Over the next several days, nary a chafer was found! Had all the males satisfied their natural desires? Had all the females become pregnant, laid their eggs and vanished? “After” doing the “math” on the days following the event, I counted only two beetles walking the 2-track road, one headed north — one headed south. Scouts? ….. Because Lanceolated Chafer adults only live 1-2 months, and because none have been seen since the last two, that may be the end of sightings for this year. While there’s still the occasional pack of ants dragging away a dead beetle to share with their colony, the legacy of adult chafers lives on. Recently-laid eggs will hatch after only 18 days into white or cream colored, C-shaped larvae. Those grubs will munch away on mallow and grass roots for the next 1-3 years until a perfectly warm mid-June day, sometime in the future, the adults emerge from the soil to complete their life cycle.

Epilogue
Since most chafer beetles are nocturnal (active at night), if you’ve seen an adult during the day, it may have been the Lanceolated species which are diurnal (active during the day). And you may have unwittingly encountered any of the chafer species found in North America…….

…….. If you’ve ever seen one or more of your carefully-tended, vigorously-growing garden plants up and die overnight, it may have been victimized by root-living chafer grubs.
…….. If you live in the central or eastern U.S., grubs may be feasting on the roots of agricultural crops, like corn, soy, or sunflowers. Headline news is sure to cover the story of devastation and financial ruin brought on by the voracious chafer beetle larvae, complete with video of farmers holding a handful of grubs dug from below the soil surface.
Have you experienced one of these close encounters?
Hope you’ve found the “Life and Times of the Lanceolated Chafer” interesting (or maybe educational, peculiar, or maybe even fascinating!?!). Let me know what you thought.
As always, thanks for stopping by!
1 A flash mob is defined as a large group of people who suddenly assemble in a public place, perform a brief, pre-arranged action (like a synchronized dance), and then quickly disperse. Flash mobs are typically organized online via social media or viral messaging for entertainment or artistic expression. I think this definition nearly perfectly fits the chafer beetle dance I was witness to on that fine mid-June morning somewhere along the 2-track rock pile trail.





















