Japanese beetles and stag beetles are popular insects enjoyed by children and adults alike. When bringing one home, you naturally want to select a healthy, long-lasting specimen. As of 2026, online platforms where you can purchase directly from breeders have become widespread, making it possible to find excellent specimens from all over the country without leaving home. Here we explain how to compare purchase options, choose the right purchase timing, select quality specimens, and prevent purchasing troubles.
Purchase Options
There are several main places where you can purchase Japanese beetles and stag beetles. Understand the characteristics of each option and choose accordingly.
- Insect specialty shops: Wide selection with plenty of breeding supplies available. Easy to consult with staff
- Breeders (private breeders): Access unique bloodlines and large-sized specimens. Can directly confirm detailed information
- Home improvement stores: Primarily domestic species sold during summer. Convenient but quality varies
- Breeder direct sales platforms: Services like Brichoku allow you to purchase directly from insect breeders nationwide. The major advantage is being able to confirm emergence date, bloodline, and breeding temperature in advance
- Insect events and auctions: Many breeders gather, allowing direct selection. A great opportunity to hone your eye for quality
Optimal Timing for Purchase
Japanese Beetles
- Adults: Late June through August is best. July has the highest circulation volume
- Larvae: September through the following March is when they're easiest to obtain. Purchasing in autumn allows you to enjoy the following summer's emergence
Japanese Stag Beetles
- Ohkuwagata adults: Available year-round. Breeders typically sell after emergence
- Nokogiri Kuwagata and Miyama Kuwagata adults: Centered around June to August
- Larvae: Generally purchased in autumn/winter and you wait for the following year's emergence
Foreign Species
Many are available year-round, though breeding timing may limit availability. Popular species like Hercules beetles and Giraffa stag beetles often sell out early, so if you have a specific species in mind, we recommend contacting the breeder in advance.
How to Select Quality Specimens
In the Case of Adults
Appearance Checks
- Tarsi (claw) loss: Confirm that all claws on the legs are intact. Specimens with missing tarsi may have shortened lifespans
- Body scratches and dents: Check for major scratches or dents. Avoid specimens with incomplete emergence (wings not fully closed)
- Gloss/Shine: The body surface has shine and isn't powdery. Powdery specimens may be aging
- Mandibles (in the case of stag beetles): Symmetrical and without cracks or chips
- Size: Generally, larger specimens have higher value for viewing and breeding
Behavior Checks
- Vitality: Legs move firmly and grip strongly when held
- Feeding: Eating jelly well (post-emergence feeding confirmed)
- Activity level: Highly energetic specimens that struggle are a good sign
In the Case of Larvae
- Size: Among the same instar level, larger specimens are more promising
- Body color: Healthy larvae are milky white to slightly yellow. Avoid darkened specimens
- Movement: When touched, specimens that curl their bodies in response show signs of vitality
- Instar confirmation: Confirm with the seller which instar (first, second, third) the larvae are
Things to Confirm Before Purchase
- Emergence date (in the case of adults): Knowing when it emerged gives an idea of remaining lifespan
- Post-emergence feeding status: Has the specimen begun eating jelly after emergence? (Particularly important if breeding is planned)
- Generation number: How many generations of breeding. Excessive inbreeding raises concerns about trait deterioration
- Origin (in the case of wild-caught): Where it was collected
- Breeding temperature: At what temperature range was it maintained? (Important to replicate the same environment after purchase)
Precautions When Buying Foreign Species
- Species designated as specific invasive species are prohibited for keeping: Confirm with the Ministry of the Environment's list before purchasing
- Temperature control is necessary: Tropical species require heater management during winter
- Lifespan: Varies greatly by species from several months to several years
- Legal confirmation: Check regulations regarding the import and keeping of foreign insects in advance
Initial Care After Purchase
- Temperature: Domestic species can be kept at room temperature. Foreign species must be maintained at appropriate temperatures for the species
- Case preparation: For adults, spread approximately 5cm of substrate, and add wood chips or bark for traction to prevent tipping
- Food: Keep insect jelly supplied continuously. Fruit rots easily, so jelly is recommended
- Pair management: Keep males and females in separate cases; only place together for breeding
Precautions to Prevent Purchasing Issues
The most common trouble with insect purchases is "the specimen wasn't what I expected." Photos and actual specimens can differ, particularly on auction sites. To prevent this, it's important to confirm photos from multiple angles in advance, have the size (body length) clearly stated, and verify breeding records (CBF1, WF1, etc.). Also be careful about the timing of specimen shipment. Extreme temperatures like peak summer (35°C or higher) or peak winter (5°C or lower) increase the risk of death during transport. It's reassuring to confirm in advance the packing methods used during shipment (whether cooling packs or disposable heat packs are included).
Find Japanese Beetles and Stag Beetles on Brichoku
On Brichoku, you can purchase directly from breeders who specialize in breeding Japanese beetles and stag beetles. Because you can confirm detailed information with the breeder such as emergence date, bloodline, and breeding environment, you can select quality specimens with confidence. If you're looking for large specimens or rare varieties, be sure to check it out. Since escrow payment is adopted, protections are in place in case of any trouble.
