What's That Bug? does not endorse extermination

Subject:  Small black beetles  with jewel colors of blue and violet
Geographic location of the bug:  Little Belt mountains Montana
Date: 08/20/2018
Time: 11:48 AM EDT
Your letter to the bugman:  I have seen these in the months of June and July on blooming mountain lupines in the Little Belt and the Castle Mountains. I would like to know what kind of beetle these are?
How you want your letter signed:  David C Powers

Blister Beetle

Dear David,
The image of a solitary beetle on a blossom is definitely a Blister Beetle in the family Meloidae, but we are uncertain of the species.  The other image showing an aggregation of Beetles appears to be a different species.  Can you clarify any information on these two images, especially the group of beetles.  Were they found aggregating as the image depicts?  Here is a BugGuide image of 
Linsleya sphaericollis that resembles the Blister Beetle in your image of a solitary individual, but again, we cannot verify the species.

Aggregation of Beetles

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What's That Bug? does not endorse extermination
Location: Little Belt Mountains, Montana

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