Currently viewing the category: "Frit Flies"

Subject: tiny bugs on outside walls of house
Location: Phoenix AZ
April 28, 2014 3:22 pm
we just noticed these buggers on our outside walls. they don’t appear to fly; when i touch the wall near one, it falls,. the photo is of a bougainvillea petal floating in our pool, with what (i think?) appears to be a queen! either that, or something wanting to eat them all. please help, so we know what to do, if you can. they are getting inside one window which doesn’t seal properly and a parakeet lives near that window! thank you!!
Signature: suzy

Possibly Immature Dirt Colored Seed Bugs and Syrphid Fly

Possibly Immature False Chinch Bugs and Frit Fly

Dear Suzy,
These immature Heteropterans look remarkably like some still unidentified, possibly Dirt Colored Seed Bugs we posted from Montana in 2012.  The Fly may be a Syrphid Fly, a family that has many species with larvae that feed on Aphids, members of the same insect order as your True Bugs.  We will try to get Eric Eaton’s opinion on this identification.

Eric Eaton Responds
Wow, immatures are really hard.  I suspect something in the “Lygaeoidea” like you do, but….Fly might be a Chloropidae [Ed. Note:  See BugGuide].  This whole image looks like something out of a sweep net sample through a grassland.

Ed. Note:  May 2, 2014
We posted some images of a very similar Heteropteran nymph that might be a False Chinch Bug,
Nysius raphanus, and the same is likely true for this posting.  According to Colorado State University Extension:  “Mass migrations of false chinch bugs in the vicinity of buildings are primarily associated with very hot, dry weather. This may force the insects to move from drying weed hosts to seek shelter and higher humidity. Migrations indoors may occur through openings and cause nuisance problems. However, false chinch bugs do not bite, do not feed nor damage anything indoors, and will ultimately die out if trapped inside.  Irrigated landscapes adjacent to buildings may further encourage false chinch bug migrations to these areas. Therefore it may be desirable to temporarily discontinue watering in the immediate vicinity of the building when a problem migration is in progress. Providing cool, humid areas at some distance may encourage the insects to move away more rapidly.”  According to BugGuide:  “3 (or more) species are introduced N. caledoniae, huttoni, vinitor” which supports our believe that this might be an invasive exotic species.

Subject: Thaumatomyia glabra
Location: Northeast Florida
June 23, 2012 10:15 pm
I always enjoy reading What’s That Bug and it’s been awhile since I sent in a photo. I saw this tiny fly (about 2-3mm) on a lantana plant in my yard in northeast Florida. When I looked at the photo and saw the coloring and details, at first I thought it looked like some kind of Hover Fly. I went to BugGuide and started searching, and I finally found my fly (I think)– Thaumatomyia glabra. If you would like to include it on What’s That Bug, you’re welcome to do so.
Signature: Karen in FL

Glass Fly

Hi Karen,
Thanks for your compliments.  We checked BugGuide and learned that your species,
Thaumatomyia glabra, is classified in the Frit Fly family Chloropidae and the Grass Fly subfamily Chloropinae and that “‘The larvae of Chloropisca glabra are peculiar among Chloropids in being predaceous on root aphids.’ — Sabrosky, 1935”.  It seems they are among the most beneficial members of the family because BugGuide states on the family page:  “Larvae feed on grass stems. Some are serious pests of cereals. Some scavengers, some parasitic or predaceous” and “They are attracted to the eyes, sometimes are called eye gnats. They are vectors of yaws and pink eye.”  Thank you so much for sending us your photo.

Small fly type bug
Location: Colorado Springs CO
July 7, 2011 12:39 pm
A friend gave me a Meyer lemon tree and it is now blooming. The blooms are very fragrant and are attracting these very small yellow and black fly type insects. They look like a type of fly to me but maybe they are a bee? Thanks for any help identifying it.
Signature: Eva Seifert

I think I may have found out what it is, a grass fly.

Grass Fly

Hi Eva,
Congratulations on identifying your Grass Fly in the genus
Thaumatomyia.  Both the genus and family, Chloropidae, the Frit Flies, are new to our site.  We verified your identification on BugGuide which indicates the larvae feed on Aphids.  Perhaps that is why the fly is attracted to your lemon.