What kind of insect is this

Question: This insect was killed by me about 3 days before the picture was taken so it might be a little shriveled up. It seemed closer to one inch initially (head to end tip of wings) but I am not sure about that. This is the 3rd such insect of this type that I killed on the outside of my kitchen window over a period of at least 1.5 weeks.  They do not seem to startle easily as a housefly would and were easy to squash. I am including two pictures from two different angles. I have since read your tips for taking photos and will try to remember to use them next time.
Thanks.

responder: Answered by the Home and Garden Information Center (HGIC), University of Maryland Extension. For timely gardening information and tips, subscribe to our Maryland Grows blog and quarterly newsletter. Follow us on Facebook, Instagram, and YouTube. Replied February 27, 2023, 5:22 PM EST
response: This appears to be a stonefly (possibly one of the group referred to as a "winter stonefly"), a type of insect whose larvae are aquatic and which are not pests for people. There are an impressive number of stonefly species that have been recorded from (or are expected to be present in) Maryland. They can be a sign of good water quality in streams since their larvae are not very tolerant of water pollution, and the adults in the "winter" group emerge early and are known to be attracted to night lighting.  If they bother you, we suggest trying to block the light leaving the window (or if there's a deck light or some other lamp lit outside that window at night, keeping it off for the time being). Otherwise, they'll pose no threat and may be gone relatively soon as the adults breed and die off. If you're curious, you can learn more about stonefly life cycles and what they eat in the entry for their insect group on the BugGuide website: Stoneflies. (Skim down to the second half of the page or so.)  Miri

responder: The Question Asker Replied February 27, 2023, 7:10 PM EST
response: Miri,Thanks very much. They are not bothering me other than I don’t recall seeing them before, and I wanted to make sure they weren’t harmful.There seem to be a lot of varieties. And even the pictures for the same variety don’t always seem to match, but the picture at this site looks like what I am seeing.https://www.wikidata.org/wiki/Q1966575Thanks, again. SusanOn Feb 27, 2023, at 5:22 PM, Ask Extension <<personal data hidden>> wrote:

responder: Answered by the Home and Garden Information Center (HGIC), University of Maryland Extension. For timely gardening information and tips, subscribe to our Maryland Grows blog and quarterly newsletter. Follow us on Facebook, Instagram, and YouTube. Replied February 28, 2023, 9:15 AM EST
response: You're welcome.  Some of the pictures in the Maryland Biodiversity Project galleries for stoneflies are showing nymphs in addition to adults, which is why they look different. Others have different body colors depending on how recently they molted into adulthood when the picture was taken. Otherwise, many of them look very similar to each other so making an ID to species level is very difficult. The species in the link you shared, Taeniopteryx nebulosa, isn't included on Maryland Biodiversity's list of stonefly species found in Maryland, and appears to occur in Europe. Still, other members of that genus are present here, and it's always possible it's a species that hasn't been recorded here thus far. Identification to species level for insects often requires the use of a microscope and the comparison of fine details not easily seen in photos, so it's unlikely we can come close to a determination of species in this case.  Miri