Black flies are small, 1 to 5 mm in length, robust, strong flying insects that have a humpbacked appearance, hence the common name buffalo fly.
(Black flies; are; small, 1 to 5 mm in length, robust, strong flying insects that have a humpbacked appearance) (small, 1 to 5 mm in length, robust, strong flying insects; have; a humpbacked appearance)
Black flies small, 1 to 5 mm in length, robust, strong flying insects
are have
small, 1 to 5 mm in length, robust, strong flying insects that have a humpbacked appearance
a humpbacked appearance