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1.Antenna- 2 small 6.Thorax HORSE FLY 1.Antenna- 2 small 6.Thorax HORSE FLY
2.Eyes- 2 compound 7.Petiole- none 2.Eyes- 2 compound 7.Petiole- none
3.Head 8.Abdomen 2 6 3.Head 8.Abdomen 2 6
4.Legs- 6 9.Color- gray to black 4.Legs- 6 9.Color- gray to black
5.Wings- one pair 10.Other- only female bites 5 5.Wings- one pair 10.Other- only female bites 5
Life Cycle Life Cycle
From 100-800 eggs are deposited on objects near water. They 8 From 100-800 eggs are deposited on objects near water. They 8
hatch in a week or less, and the larvae live in water or mud, feed- 3 hatch in a week or less, and the larvae live in water or mud, feed- 3
ing on organic matter. They go above the water level to pupate. It ing on organic matter. They go above the water level to pupate. It
generally takes one year per generation. Photo Courtesy of UNIVAR generally takes one year per generation. Photo Courtesy of UNIVAR

HORSE FLY Actual size 3/4” HORSE FLY Actual size 3/4”

Horse flies are large, about ¾ inch in body size. They are generally black, with large eyes. Horse flies are large, about ¾ inch in body size. They are generally black, with large eyes.
They breed near water, laying eggs in trees, tules and bullrushes, grasses, and other vegeta- They breed near water, laying eggs in trees, tules and bullrushes, grasses, and other vegeta-
tion near their favorite water areas. Larvae bite other creatures found in water such as snails, tion near their favorite water areas. Larvae bite other creatures found in water such as snails,
and kill them with a venomous bite. They can be quite large and worm-like, up to 1 7/8 inches and kill them with a venomous bite. They can be quite large and worm-like, up to 1 7/8 inches
long. As with mosquitoes, only the female bites, and it can be painful. They prefer horses long. As with mosquitoes, only the female bites, and it can be painful. They prefer horses
(obviously) and cattle, but will readily bite humans. The males make a meal from plant nectars (obviously) and cattle, but will readily bite humans. The males make a meal from plant nectars
and fluids, as do females on occasion. and fluids, as do females on occasion.

1.Antenna- 12-16 segmented 6.Thorax DRAIN FLY 1.Antenna- 12-16 segmented 6.Thorax DRAIN FLY
2.Eyes 7.Petiole- none 2.Eyes 7.Petiole- none
3.Head 8.Abdomen 6 3.Head 8.Abdomen 6
4.Legs- 6 9.Color- yellowish to blackish 4.Legs- 6 9.Color- yellowish to blackish
5.Wings- broadly oval 10.Other- delicate and fuzzy 5 5.Wings- broadly oval 10.Other- delicate and fuzzy 5
Life Cycle 8 Life Cycle 8
From 30-100 eggs are laid at a time, hatching in 32-48 hours. The From 30-100 eggs are laid at a time, hatching in 32-48 hours. The
larvae and pupa live in slime, extending breathing tubes above the larvae and pupa live in slime, extending breathing tubes above the
surface. The larval stage will usually range from 9-15 days, but the surface. The larval stage will usually range from 9-15 days, but the
pupa develop in only 20-40 hours. With warm temperatures, the life 3 2 pupa develop in only 20-40 hours. With warm temperatures, the life 3 2
cycle can be completed in as little as eight days, but can extend up to cycle can be completed in as little as eight days, but can extend up to
24 days in cooler conditions. Photo Courtesy of UNIVAR 24 days in cooler conditions. Photo Courtesy of UNIVAR

DRAIN FLY Actual size 1/8” DRAIN FLY Actual size 1/8”

Also known as Moth, Filter, Bathroom, and Sewage flies, they breed in filth, especially inhabit- Also known as Moth, Filter, Bathroom, and Sewage flies, they breed in filth, especially inhabit-
ing sewage treatment plants. Only about 1/8th inch in size, they are furry looking with speck- ing sewage treatment plants. Only about 1/8th inch in size, they are furry looking with speck-
led wings. Drain flies carry disease, and can cause breathing problems for those with asthma. led wings. Drain flies carry disease, and can cause breathing problems for those with asthma.
They are usually found in houses emerging from the drains of sinks and bathtubs. They are usually found in houses emerging from the drains of sinks and bathtubs.

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