 Larvae develop in moist and rotting organic matter, so different stages of the fly have been found variously in the manures of cows, horses, and guinea pigs, in human waste and decaying heaps of vegetable waste, and in garden compost.The larva has a length of 10 mm, a width of 2.75 mm, and a height of 2 mm.The body is dim yellow and tapers at both ends, at the false head and more narrowly at the posterior end, where the broadest part of the body is from the fifth to the ninth segment.