Sarcophagids are also called flesh flies. They are 10-14 mm long and the body is robust and dull grayish black; they have three dark stripes on the dorsum of the thorax. Most are parasitic on arthropods or mollusks, some on vertebrates, and several are associated with carrion and excrement. The common species are characterized by a black and gray checkerboard pattern on their abdomen. Larvae are yellowish white and are characterized by having the posterior spiracles somewhat concealed in a pronounced depression or cleft at the posterior end. Eggs develop within the female's body and she is able to depositfirst-stage larvae directly on a potential larval food source. This can decrease the development time and permit the larvae to utilize a temporary food source. There are several species thatregularly occur in the urban environment.

Banded flesh fly, Eumacronychia decens Adults are 4-9 mm long and the body is gray, the thorax has dark longitudinal lines. The abdomen is a white and black checkerboard, and the tip of the abdomen is orange brown. Females enter and lay eggs in the cells of wasp nests, after first destroying the wasp eggs. The developing fly larvae consume the food provided by the wasps, and complete developmentin the wasp nest. There are several generations per year.

Red-eyed flesh fly, Sarcophaga aldrichi Adults are about 12 mm long and distinguished by a grayish-black body and red eyes. This species occurs throughout southern Canada, and eastern USA. Adults are often numerous outdoors and may be a nuisance. Larvae feed on insects, and they are common predators of pupae of the forest tent caterpillar (Malacosoma disstria). S. aldrichi may be abundant when there is a large population of this caterpillar in the area. A related species, S. houghi, is found in southern USA where it is a frequent predator of the forest tent caterpillar and elm spanworm, Ennomos subsignarius.

Sarcophaga crassipalpis (Fig. 7.5c, d) Adults about 14 mm long and a with black stripes on the thorax, and a black and white checkered pattern on the abdomen. The tip of the abdomen is orange brown. Full-grown larvae are 20-22 mm long and yellowish white. The abdomen is covered with small papillae, and there are bands of setae around each segment. The anterior spiracles have 12-15 lobes; the posterior spiracles are in a deep cavity, and the peritreme is incomplete. Larvae infest ham and other prepared meats, and it has been found in wounds and bedsores. This species occurs in North America, Europe, South America, South Africa, and Australia.

Redtailed flesh fly, Sarcophaga cruentata (= S. haemor-rhoidalis) (Fig. 7.7b) Adults are 10-14 mm long and the body is blackish gray. Male genitalia is reddish brown, and the eyes are reddish brown. Larvae are primarily scavengers, and feed on dead insects, carrion, and excrement. On carrion, the larval development is about 6 days, and the pupal period is 8-10 days. Adults live about 30 days and there are several generations per year. This species is widely distributed in North and South America, Europe, Africa, and Asia.

Asian flesh fly, Sarcophaga peregrina Adults are 10-14 mm long and the body is black to grayish black. The male genitalia is usually brown. Females are attracted to a variety of substrates, including fresh meat and carrion, and human excrement. It is closely associated with humans, indoors and outdoors throughoutits range. This sarcophagid is distributed in southern to eastern Asia and Australia, and also in the Pacific islands.

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