206 
to occur under the skin of Antlius pratensis, Passer domesticus 
and swallows, and it is rather probable, that there are other flies, 
whose larvæ have similar habits; thus a maggot found under the 
skin of a young sparrow and described by Kirsch 1 ) does not 
agree with the description of the larva of Protocalliphora azurea 
by D ufo ur 2 ). Outside Europe such parasitic larvæ are only known 
from the Antillæ and from South-America. In 1854 Macquard 3 ) 
described under the name of Aricia pici a fly, which Sallé had bred 
from a maggot, squeezed out from a tumor on a Picus striatus from 
St. Domingo; the autor adds, that S.allé had seen similar tu¬ 
mors in Mexico 011 other birds ( Icterus ) and on squirrels. Later 
on Loew 4 ) described the same fly from Cuba as Hylemyia angu- 
stifrons n. sp. (cfr. Aldrichs catalogue). This fly resembles to 
a high degree the species treated in this paper, but as the de- 
scriptions are rather short it is not to decide with certainty, whe- 
ther Mydæa anomala is identical with it. 
In a series of essays on various parasitic Muscidæ K. Blan¬ 
chard 5 ) also mentions and figures a specimen of a parasitic fly, 
whose larva was found in a wound on the head of a bird ( Oriolus 
cayennensis ) in Guyana and in the same paper the author also 
shortly records another somewhat greater maggot from the head of 
Oriolus mexicanus. Blanchard is inclined to adopt the spe- 
cific identity of the bred fly with Aricia pici of Macquard 
notwithstanding some differences especially in the colour of the 
abdomen, but the late Austrian dipterist Fr. Brauer identified it 
with Mesembrina anomala Jaennicke , whose type is found in the 
J ) Th. Kirsch: Ueber zwei Fliegenlarven aus dem Nacken eines jungen 
Sperlings. (Berliner entomol. Zeitschr. 11. Jahrg. 1867 pag. 245). 
2 ) Leon Dufour: Histoires des métamorphoses de la Lucilia dispar 
(Ann. d. la Soc. entom. de France 2. Sér. III. 1845 pag. 205). 
3 ) Macquard: Notice sur une nouvelle espéce dAricia (Ann. d. la Soc. 
entom. de France 3. Sér. I. 1853 pag. 655). 
4 ) Loew: Diptera aliquot in insula Cuba collecta (Wiener entom. Mo- 
natschrift Y. 1861 pag. 9). 
5 ) K. Blanchard: Contributions å l’étude des Diptéres parasites (Troi- 
siéme série. Ann. Soc. Entom. Fr. LXV 1896 pag. 652). 
