570 MODERN CLASSIFICATION OF INSECTS. 
tute of any appearance of articulation. The entire development of 
these insects is effected in a very short time in thesummer. Meigen 
has given some curious calculations as to the multiplication of these 
insects (vol. v. p. 20.). Rosel has given the details of the history of one 
of these meat-flies ; the species, however, is difficult to be determined. 
(Ins. Belust. vol. ii. tab.9, 10., Muscidum.) Mr. Newport has 
also given an excellent figure of one of these larva (art. Jnsect, in 
Cyclop. of Anat. p.21., and my jig. 132. 1—2. anterior part of the 
body still more highly magnified), as has also Réaumur (tom. iv. pl. 12. 
fig. 1—9.). (See, also, the work of Keller on the domestic fly, with 
four plates, above referred to.) 
The species of the subgenus Musca, as restricted to Musca domes- 
tica, the small common house-fly, are found more especially in houses, 
settling upon and sipping at almost every article of food. Their larvee 
are found in dung, &c. as are also those of the Mesembrinez. The 
larva of M. domestica is elongated, slightly attenuated in front, with 
a small head; and the terminal segment bearing a pair of spiracles, 
entire, and smaller than the preceding, without any radiating points. 
The larva of M. Hortorum is much thicker behind, with a larger head. 
Bouché has figured these larva, and has described those of several 
other species. De Geer has also given the details of the transform- 
ations of M. domestica. (Mém. tom. vi. pl. 4. fig. 1—10.) 
The species of the genus Anthomyia and the allied genera undergo 
their transformations in rotten vegetable matter, or in manure, excre- 
ment, &c. Bouché has described the larvee of many species of An- 
thomyia, some of which reside in cow-dung, and others in the roots 
of vegetables, such as onions, radishes, and other vegetable matter, 
earth, rotten leaves, &c. The species which feed on onions and 
other garden plants are occasionally very obnoxious. (See my memoir 
on Anthomyia Ceparum in Gardener's Mag. No. 87.) Fig. 132. 3. re- 
presents this species, 4. its antenne, 5. its larva magnified, and 6. its 
puparium. (See also De Geer, Mém. tom. vi. tab. 5. fig. 2—7.) Two 
other species, Anthomyia Brassicaee and Lactucarum, are also ob- 
noxious to cabbage and lettuce plants. (See Bouché, and Kollar, Obnox. 
Ins., transl., p. 160.) 
Bouché has very properly separated from Anthomyia some species, 
the larvee of which have the bedy much depressed, narrowed towards 
the front, with the sides furnished with long setose filaments.* To 
* Fallen observes upon his Musca canicularis, ‘‘ Larve onisciformes e stomacho 
hominum egresse, ad hane vel M. meteoricam forsitan pertinent ?” 
