Hi….I have for years seen a very strange looking large bug in my yard in California but have not seen it anywhere else in the US. It is roughly 1.5-22 long, yellow with black stripes, super shiny, 3 segments, and the tentacles or arms look so fat it almost looks like it has baby arms. It is by far the most disgusting bug I1ve ever seen.
What is it?
Best Regards,

Dear Kayce,
If you hadn’t said you lived in California, I would have immediately thought of the Locust Borer, a large beetle that fits your description. I did a web search, and have noticed that the range is expanding. Here in Los Angeles, we do have Black Locust Trees, so it is conceivable that the range of the Locust Borer now includes California. Here is additional information as well as a photo. Please let us know if the range of the Locust Borer now includes California. The locust borer, Megacyllene r
obiniae (Forst.), is a native insect. Its original range probably coincided with that of its host tree, the black locust, which once grew only along the Allegheny Mountains from Pennsylvania to Georgia and in the Ozark Mountain region. Black locust grows readily on poor sites and is used extensively in land-reclamation plantings. Its widespread use to reclaim land damaged by farming and strip mining, its use as a shade tree, and its use in reforestation have dispersed the borer with its host tree over most of the United States. The borer is now found from eastern Canada south to the Gulf States and west to Washington, Colorado, and Arizona. The borer attacks only black locust (Robinia pseudoacacia L.) and its cultivars (horticulturally derived varieties in the genus Robinia); the honey locust (Gleditsia triacanthos L.) is not affected.

4 Responses to Re: Yellow and Black

  1. smiths says:

    We live in southwest Iowa and we just noticed these bugs all over the side of our house.. this helped us out alot we had no idea what they were

  2. Linda lucky says:

    I found large yellow with brown design on shell bettle type bug? It is 2 inches long and inch wide? Beautiful design on hard shell! Found in West Virginia?

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