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Entomology (Study of Bugs)/Unknown 6cm larva, Lima, Peru


Dear Dr. Riggs. Greetings from the DEEP south!  I include via link, two photographs (full body and mouth parts) of a BIG suprise I found today in a "trap" that I had placed in a "planter" on my terrace.  The "trap" had the purpose of harvesting E. F worms, but like the bass fisherman who ens up with a bull shark, I got a surprise.

Despite being frmo another continent, I thought to pass it on to you in case you had any interest at looking at it (I saw your earlier identification of a Hercules or Unicorn Beetle larva) and making any comment (here, or in the vermiculure group where I am known as "GRINCHOLO").

Either way, I hope you are having a good day!

Best wishes,



Thanks for your question!

This is definitely a scarab beetle looks to be about half grown on the way to pupating to the adult stage.  I can't give you an exact species determination.  It could be one of the Hercules beetles or could be a June beetle larva.

The other larva looks like one of the predaceous beetle larvae.  

Entomology (Study of Bugs)

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Nathan Riggs


I currently live in San Antonio, TX and have expertise in identifying insects, many types of spiders, and other arthropod critters that infest lawns, ornamentals, structures, trees, pets and livestock. Mites are not a strong point of mine. I'm not a licensed doctor, so I cannot provide medical diagnosis of conditions possibly related to insects or other arthropods. If you've got an interesting photo for me to see, attach it to your question, or let me know and I'll give you my email so the picture will get to me. If you have hosted an insect photo on a website, please include the link so I can go look at it and provide a faster ID for you. You may also join my group page on Facebook and post your picture at


22+ years' experience as an entomologist: 5 years as a biologist with Merck Animal Health (I was part of the R&D team that worked to develop FrontLine flea and tick products) and 7 years as an Integrated Pest Management (IPM) Specialist in San Antonio, Texas with Texas Cooperative Extension.

Veterinary Parasitology, Southwestern Entomologist, San Antonio Express News, San Antonio Gardener Newsletter, Master Gardener SCION Newsletter, GardenStyleSA e-Newsletter

BS - Entomology from Texas A&M University in 1992.

Board Certified Entomologist, 1996-2000 - Medical and Veterinary Entomology Specialty (Entomological Society of America)

Awards and Honors
2000 Texas A&M University Vice Chancellor's Award in Excellence for leadership on the Texas Fire Ant Program Educational Team.

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