568 MODERN CLASSIFICATION OF INSECTS. 
violaceus. (Isis, 1831, No.7.) M. St. Fargeau has also observed a 
species of Myobia emerging from the body of one of the Curculion- 
idz (according to Macquart). The same author has also observed 
various species of these insects unceasing in their endeavours to de- 
posit their eggs in the nests of various Hymenoptera, already provi- 
sioned with the bodies of other insects, upon the store of provisions in 
which the parasitic larva, first hatched, is fed; and thus the real in- 
habitant of the cell is starved to death, its supply of food being de- 
voured. Mr. Curtis also mentions that he had observed Miltogramma 
punctata pursuing Colletes fodiens. (Brit. Ent. pl. 529.) The bee, 
however, only provisions its nest with pollen paste; so that, if the 
Miltegramma were its parasite, it must destroy its larva. I have 
observed other species, which frequent the burrows of other An- 
drenide. R. Desvoidy states that he has observed a spider with 
its body pierced, and several puparia of Tachinz close to it; and I 
have reareda species of ‘Tachina from masses of spiders’ eggs. Bouché 
has described a species of Tachina (T. inflexa, forming, with two other 
species, a distinct subgenus, Compsilura), the larva of which is para- 
sitic in the larva of Tenthredo grossulariata. The larvee of Ta. con- 
cinnata (Bouché, Naturg. tab. 5. f.15., and my jig. 131. 20.) have the 
segments much constricted, and of nearly equal thickness through- 
out; the head is very small; the last segment bears two spiracles, and 
is much smaller than the preceding segment (fig. 131. 21. represents 
one of the prothoracic spiracles). Robineau Desvoidy states that he 
possessed the pupa of one of these insects, which lived in the body of 
one of the Noctuide, but which was in its turn filled with a great 
quantity of the larvee of smaller Myodaires.* This author has pro- 
posed a variety of interesting questions as to the habits of the Tachin- 
idw, and especially with reference to certain species or tribes being 
appropriated to particular groups or species on which they are para- 
sitic. (See also Gimerthall on the transformations of various species 
of Tachina, in Bull. Soc. Naturalistes de Moscou, 1829, No. 4, 5.3 
Réaumur, Mém. tom. ii. pl. 36.) 
Sarcophaga (S. carnaria, the flesh-fly, &c.) and the allied genera are 
very peculiar in their mode of development. The female being vi- 
viparous, the ovaries are of very large size, and arranged in a spiral 
* In the Mag. of Nat. Hist. No. 25. is a notice of the parasitic larve of Tachina 
Larvarum, being subjeet to the parasitie attacks of Pteromalidcous insects. 
