Ants in the Backyard

Martha O'Kennon

When I first discovered that ants are not to be feared but marveled at, I thought that they all looked alike, and that they were all variations on the Carpenter Ant, and needed to be kept away from our nice wooden houses. One of the first things I learned was that even so-called Carpenter Ants don't really go for houses. They are often carnivores, that is to say mostly insectivores. Some eat plants. Here I'm going to show you some of the ants I've seen in my yard. Unless otherwise stated, Steven Wang, @stevenw12339 of iNat, identified the ants in these pictures and gave me useful information about each one.

Remember that there is information in the name of the file for each image. You can see it by mousing over the image - look at the lower left of the screen. Or you can click on the image to get to the (usually) larger image. Then the info is displayed in the address line above. Sometimes the second click will actually display a different view of the original image.

Carpenter Ants

Here is one of the most common Carpenter Ants, the Eastern Black Carpenter Ant, Camponotus pennsylvanicus. One of its most useful distinguishing marks is the bright yellow hairs (setae), easily seen in a decent light, on the abdomen. In the last image, this ant is one of the kinds that can tend treehoppers and/or their nymphs. Here the treehopper is Entylia carinata, the keeled treehopper. It likes thistles in my yard, but I understand it has other pet plants elsewhere. Note that the ant seems to be nuzzling the nymph and the nymph is responding by exuding a drop of "honeydew", a favorite of ants.

This is the Smaller Carpenter Ant, Camponotus nearcticus. One clue is shiniess, although I'm not good at spotting this in my own photos.

This is Camponotus subbarbatus, a bright rusty carpenter ant.

The Small Honey Ant

The first Ant I met was the Small Honey Ant (formerly known as the False Honey Ant). The first one I ever met was a Queen. They are remarkable in that the workers, males and queens are all so different in color and size. The worker is a non-fertile female that is easy to identify mainly by her large abdomen or gaster. In this first picture, the worker has been foraging very effectively and it shows in the size of her greatly expanded gaster. Next is a male and a worker side by side, and last shows the huge discrepancy in size between the enormous queen and the tiny male.

If you have time to peruse it, here is an account of a scene from April 2019 in which several queens mate and escape to start new nests.

Citronella Ants - Genus Lasius

Here is the Smaller Yellow Ant, Lasius claviger. Look how different it may appear from various angles.

The Larger Yellow Ant, Lasius interjectus. Whoever named this ran on a different ROYGBIV scale from me.

This Turf-grass Ant, Lasius neoniger, has a little nest in my South Yard. On June 1, 2020, ants were coming in and going out from that nest.

Here is one more Lasius: Lasius americanus is a tiny ant that I found on top of a redbud leaf during the Socially Distant Bio-Blitz of July 26, 2020. I like its sleek face.

This Citronella Ant is in the genus Lasius, but wasn't identified to species yet. It's about 4 mm long.


This Hairless Rover Ant, Brachymyrmex depilis, is not usually seen. Its skin is so thin that it dries out if above the ground too long. So I was glad to see it up on a leaf. This year I even saw them in a Keeled Treehopper colony trying to nanny the nymphs! Look here

This ant is the Immigrant Pavement Ant. One of its distinguishing characteristics is its square head. In this small video, the ants are trying to carry a large beetle out of the nest.

This tiny ant Temnothorax curvispinosus was the first yellow ant I had ever noticed. I really had never thought my yard could harbor so many different kinds of ants.

This interestly posed ant is most likely the Silky Ant, Formica subsericea. The next two were some that I incorrectly identified as Silkies, but are in fact the ironically very common Odorous House Ants, Tapinoma sessile, which I'd never consciously seen before. Apparently if you know what you're doing, you might be able to detect a scent.

Ant Mimics

There are a number of other arthropods whose younger forms resemble an ant. For example, there is a Spider that mimics an Ant, but I've never seen one of those. There are two bugs, however, that I've seen nymphs and adults.

The Lupine Bug, Megalotomus quinquespinosus

This bug is in the family Alydidae of Broad-headed Bugs. Its nymph surprised me one day as I was perusing a large Thistle plant and saw (Picture 1) what looked like a strangely shaped ant. It turned out to be a baby Lupine Bug.

Quite some time later, someone on told me that the adult of that nymph was the Lupine Bug, and sometime after that I began to see the adult Lupine Bug in my yard.

Paraxenetus guttulatus

This bug is in the family Miridae of Plant Bugs. When I first saw the nymph of this bug, I was sure it was one of those ant-mimics. It was quite special though. The abdomen looked as if it had been assembled like a child's toy. It was identified as P. guttulatus, but I had never seen the adult of this bug. The first two sightings were in July 2nd and 6th of 2018. The third was from July 15th, and the front end of the nymph looked as if it had undergone some transformations. (Compare picture 3 with Picture 3 of the next group. The fourth surprised me when I found it - it was actually from July 11th of 2016! But I had still never seen the adult.

Or so I thought. This adult bug Paraxenetus guttulatus appeared on July 17, 2018, in a goldenrod plant, but I couldn't recognize it as the adult of that mechanized nymph.

A Spider Ant Mimic

You might think, that's it, two kinds of bugs that in their nymphal form mimic ants. How many other cases do you think there might be? Well, now that I've been looking curiously at this phenomenon, I'm beginning to think there might be a lot more. So far this next one is the only other example I've found. It resembles a spider of genus Peckhamia,which seems to contain quite a few Jumping Spiders that look like ants. Another example from Bugguide is This One. The jumping spider in my picture is not either of these, but seems to be related. I thought this was an ant until I counted the legs.

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copyright Martha O'Kennon 2019