No not the same specimen they're different sexes, although I may have the sexes switched around. yes my Stenomorpha opaca did breed, I had all of my darkling beetles in the same cage and all of the larva are still pretty small, so I don't know for shore what the larva look like. although I'm pretty shore what the eggs look like

Is the date listed the day you caught the individuals or the day you photographed them? The date they were captured is the one we want, to keep a record of when these species are active. The date the photo was taken is not needed.

Interesting, be sure to post pictures of your S.opaca larva once they get bigger! Hopefully they have a good survival rate in captivity, many members of the Pimeliinae seem to be very difficult to rear, (Eusattus muricatus for example has had a pretty poor larval survival rate for me, and Asbolus is well known for being hard to breed).

the date is the day I photographed them but the wild ones were still active, with the exception of my Stenomorpha spp.

Thanks for the tip about Eusattus muricatus as I got two of them today.

Be sure to keep them in a enclosure with a substrate of mostly sand, as they seem to be psammophiles and probably won't live long in a substrate of, say coconut fiber. The same could very well be true for E.reticulatus.

Just wondering, are you a member of the Beetle Forum?

No I'm not a member of the Beetle Forum. Funny about them liking sand I found both of mine on the cement floor of my garage.

It's a nice place, full of people that share a passion for breeding beetles! (Most of them are more interested in breeding rhino and stag beetles though, not enough Tenebrionid enthusiasts there).

Yeah, they'll wander from time to time, and truth be told I've found E.muricatum in areas with clay-like soil. However I've kept them on coconut fiber in the past and they died pretty quickly, without reproducing. This year I caught a bunch in some sand dunes and kept them on a substrate of sand, and while they still had a pretty short lifespan compared to most darkling beetles, they did lay a bunch of eggs.