DIPTERA. — MUSCID&. 567 
and corresponding with the Anthomyzides of Latreille, and the Mesomyde of 
Robineau Desvoidy. 
Section 3. Acalypteres, differing from the Anthomyzides in having the front broad 
in both sexes, and the alulets rudimental or wanting, and corresponding with 
Latreille’s seven terminal sections, as well as with the seven terminal groups of 
Robineau Desvoidy. 
The third section is divided, however, by Macquart into seventeen 
subtribes ; namely, Dolichoctres, Loxocérides, Cordylurides, Sca- 
tomyzides, Psilomydes, Ortalidées, Tephritides, Sepsidées, Leptopo- 
dites, Thyreophorides, Ulidiens, Lauxanides, Hydromyzides, Piophi- 
lides, Spheerocérides, Heteromyzides, and Hypocéres, of which subtribes 
Macquart might well remark, that they “ étonnent l’imagination par 
Y'infinité des modifications dans les organes et dans les meeurs.” (Op. 
Cit. tom. ii. p. 357.) The anomalous genus Lonchoptera (fig. 132. 15. 
wing) is also placed in this family by Latreille and Fallen, but Meigen 
and Macquart form it into a distinct family. 
In the following account of the transformations of these insects, I 
have adopted the arrangement of M. Macquart, as being the most 
recent and most complete yet published. 
The Tachinides are parasitic upon other insects, the females deposit- 
ing their eggs upon the bodies of caterpillars, &c. whence the name 
Musca Larvarum, given to the typical species, and the young larvae 
penetrating into the body as soon as born, where they subsist upon 
the adipose matter so abundant in the interior, thus resembling the 
Ichneumonide. It was long ago observed by Godart and other early 
naturalists, that these flies were produced from the caterpillars and 
chrysalides of Lepidopterous insects; and Serville has reared as many 
as eighty specimens from a single larva of Acherontia Atropos. Other 
species were observed by Réaumur and De Geer, but recent ob- 
servations have proved that the other orders of insects are similarly 
subject to these attacks. 
L. Dufour has given the details of a species of Tachina, which he 
reared from a larva found in the intestines of Cassida viridis, one of 
the tortoise beetles, as well as of Ocyptera bicolor, which he reared 
from Pentatoma grisea. (Ann. de Sci. Nat. March, 1827.) The larva 
of the latter (fig. 131. 16.) has the body terminated by a long caudal 
siphon (fig. 131.17. head, and 131. 18. apex of siphon of this larva, 
131. 19. puparium of the same species), M. Von Winthem has ob- 
served that Tachina pacta is parasitic upon Carabus gemmatus and 
oOo 4& 
