DIPTERA. —- MUSCID&. 571 
this group belong Anth. canicularis Weig. and scalaris Meig. Bouché 
found the larvee of the former insect in rotten vegetables * and decayed 
cheese, and those of the latter in human excrement. The Rev. L. 
Jenyns has given a very detailed account of some of these larve, with 
lateral filaments ( fig. 132.7.),which were discharged from the intestines 
of a clergyman still alive, and which are assigned to Anth. canicularis. 
( Trans. Ent. Soc. vol.ii.) In the Medizin. Correspondenzblatt for 1832 
an account is given of the occurrence of the larva of A. scalaris in the 
human body. In the Memoirs of the Medical Society of London, vol. ii. 
1789, Dr. White also detailed the case of a patient who discharged 
similar larvee, described, but erroneously, as those of Musca carnaria.+ 
Swammerdam has selected one of these filamentous larve (being the 
offspring of the common fly of privies) to illustrate his fourth order 
of mutations. (Book of Nature, pl. 38. fig. 1—8.) Meigen refers 
this figure to Anthomyia canicularis. 
The larva of Ceenosia vaccarum Bouché lives in cow-dung, and re- 
sembles that of Musca domestica. 
M. Robineau Desvoidy observed a female of the genus Lispe de- 
positing its eggs upon the petals of a Nymphea. Bouché, however, 
describes the larva of L. tentaculata as living in puddles of water 
(Pfutzen), and also in human excrement ; it resembles that of Musca 
stabulans, but is more pointed in front. 
The larvee of the genus Pegomyia, or, at least, P. Hyoscyami, de- 
vour the parenchyma of the leaves of various plants, living between 
the two surfaces. Mr. Haliday informs me that a number of species 
are known to be fungivorous, as P. fulgens, &c. The mouth of these 
larvee is furnished with a corneous instrument in the shape of 8, which 
moves round a small fixed point, enabling them to scrape up the soft 
parenchyma of the leaf. 
Amongst the Acalypterz we find the habits of the majority agree- 
* JT have reared a species of Anthomyia from larve found in rotten fungi, closely 
resembling Réaumur’s fig. 1, 2. pl. 13. tom. iv. the lateral appendages of which are 
bristles instead of membranous pilose filaments. 
+ The occurrence of these larve in the human intestines, although singular, may 
be satisfactorily accounted for in various ways; but at the meeting of the Entomo- 
logical Society on the 4th of April, 1840, Professor Owen exhibited a Dipterous 
larva (distinct from that of Anthomyia canicularis, and wanting the lateral fila- 
ments), several of which had been discharged from the urinary bladder of a patient. 
See, also, other similar cases, noticed in Germar’s Mag vol. iii. p. 419. The Rev. 
F. W. Hope has collected a great number of cases of these occasionally intestinal 
larve in his memoir on that subject. 
