Hello:  Thank you for your message with the attached image and for contacting Iowa State University.  I admit I was not familiar with this insect when I looked at the picture, but with help from our department systematist, I've learned that the insect is a broad-headed bug, probably Alydus eurinus. This species does not have a common name.  https://bugguide.net/node/view/121521

The broad-headed bugs (Hemiptera: Alydidae) feed on the seeds of beans.  From 

https://www.cirrusimage.com/bugs_alydus_eurinus/   "Broad-headed bugs feed on developing seed of many hosts including trees, shrubs, vines, weeds and many cultivated crops. They may also feed on the stems and foliage when seed are not present. Both nymph and adult stink bugs pierce plants with their needlelike mouthparts and suck sap from pods, buds, blossoms and seeds. The degree of damage depends on the developmental stage of the plant when it is attacked. Immature fruit and pods become deformed as they develop. Seeds are often flattened and shriveled."

Alydus eurinus is found throughout North America https://bugguide.net/node/view/121521/data  but I've found little information about it being a garden pest.  I suspect it is a curiosity, but since damage is possible, I suggest carefully removing them by hand and discarding.

I would appreciate hearing your observations about this insect since I'm not familiar with it.

Thanks.

Donald Lewis (<personal data hidden>)