A client came in to me with a dilemma, some sort of insect, she feels, bit her while she slept. It turns out this insect was a ‘punkie’, a type of biting sand fly that under certain conditions can swarm and enter houses.
The client came in about two weeks ago and
complained about unseen insects biting her. I get at least one client a year
with a syndrome called “delusionary
parasitosis”, an organic malady that causes them to believe that insects
they cannot see are borrowing into their skin, laying eggs, and hatching out of
their bodies. Interestingly all of the people I’ve encountered with this seem
perfectly normal in all other aspects. She showed me some red marks that couldhave been bites or rashes raised from incessant itching. She brought in some
particles she found in her bed that turned out to be pieces of skin probably
scratched off of her during when she was itching the irritations. After I told
her the identity of the pieces she swore they must have been insects that were
biting her. She observed that the bites were occurring along her waist and near
her ankles and hands, areas where her pajamas allowed access to her skin. I
told there wasn’t much I could do unless she could find the insect that was
causing the problem. If she had delusionary parasitosis this would be an
impossible task so I didn't expect to see her again concerning this matter.
Then about two days ago she returned with a bag
containing what appeared to be black flecks. She said she had found them in the
bottom of the light cover on the ceiling light of her bedroom. “Oh jeez” I
thought to myself “another bag of itched-off skin.” I took the bag and put it
under my stereoscopic magnifier. What I saw surprised me.
The bag was actually full of insects, insects
that looked like this:
 |
The insect looked like a mosquito without the
long beak. I looked up insects related to flies and mosquitos (the order
Diptera) in my trusty “Insects
of the Los Angeles Basin” and l found one that matched – Genus
Leptoconops. These are commonly called ‘punkies’ or ‘no-see-ums’. They
are blood feeders and are notorious for biting people and causing a red, itchy
spot that, upon further itching, can develop into a rash.
On further questioning of the Client I learned
she lived in an area that was near the L.A. River. Species this genus have
been noted in the Santa Ana River, and recent restoration of the riparian habitat
of the L.A. river might have led to the repopulation of this species there.
Also, conditions were right for swarming and biting. Research on a
similar midge native to the Salt Lake Utah area has indicated that “the
number of biting flies was greatest during
warmer, less windy, sunnier periods” after rain. The nice weather that we’ve
just experienced after our recent rains matches these conditions.
So the mystery was solved. What about control?
The best thing to do is to keep the insects out of the house. They are small,
from 1-3 millimeters, so you need a screen that is correspondingly small and to
check the house for any cracks where they can enter and… do not leave your door
open when they are active, usually from three to 12 days after a rain. What
about repellents? Most repellents don’t work very well, protecting only about 50%
or less of the people who use them.
Punkie Links:
- Biting Midges | Public Health and Medical Entomology | Purdue | Biology | Entomology | Insects | Ticks | Diseases | Monitoring | Control | Hot Topics | Agriculture | Extension
- Biting Midges, Noseeums, Sand Flies, and Punkies
- biting midges, no-see-ums, Culicoides spp.
- biting midge | insect | Encyclopedia Britannica
- Backyard Gardener - Coping with No-See-Ums - September 21, 2005
- Valley Black Gnats (Leptoconops torrens)
- Field test of a lemon eucalyptus repellent against Leptoconops biti... - PubMed - NCBI
- Biting Midges in the Santa Ana River
- No-See-Ums in Feeding Frenzy This Time of Year
- Leptoconops kerteszi (3lateral) .jpg (1280×960)
- Tiny gnats wreaking havoc in Davis and Woodland
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