D. Keilin 449 
and continue to live therein when all other dipterous larvae either depart or 
are killed in it. 
PHORIDAE. 
Aphiochaeta rufipes Meigen. The larvae of this fly were found by me in 
very great numbers, and in different places, living in dead snails: H. pomatia , 
aspersa , nemoralis and hortensis. My previous paper (1911, pp. 61-75) gives 
an account of its complete life-history and a description of the larval and 
pupal stages. The larvae of this species have also been recorded from different 
decomposed organic substances. 
Aphiochaeta ruficornis Meigen. 1 have obtained the larvae of this fly only 
by killing snails and allowing them to putrefy. The material was obtained in 
Paris in the garden of the “Ecole Normale Superieure.” For a complete de¬ 
scription of the different stages of this insect see my previous paper (1911, 
pp. 76-78). 
Phora bergenstammi Mik. According to Mik (1864, p. 793) this fly was 
obtained by von Bergenstamm from pupae found in a shell of Helix pomatia. 
In 1908 and 1910 Schmitz recorded the pupae of this insect from different 
snails. In 1911 I gave a complete description of the life-history and larval 
morphology of this fly (pp. 31-56) which I bred from different dead snails: 
H. pomatia, aspersa, nemoralis, hortensis and arbustorum. 
Phora bohemani Becker. Schmitz (1908, 1910, 1917) found the pupae of 
this fly in different dead snails. 
Phora immaculata Strobl, bred by Schmitz (1917, p. 36) from dead 
snails; there are two generations per annum. The pupa resembles that of Ph. 
bergenstammi Mik. 
Phora maculata Meigen. The pupae of this species were found by Dufour 
(1840) in a shell of H. aspersa. Schmitz (1908, 1910, 1917) recorded them from 
the shells of different snails. To this species belongs also the puparium which 
I described as Phora No. 1 (1911, pp. 57-60). In 1912 my late friend J. Bonnet 
sent me a great number of dead snails: H. aspersa and nemoralis , collected by 
him near Toulouse, France, which contained the larvae and pupae of Ph. 
maculata Meig. (Text-fig. 6.) 
Phora pressata Becker. In a few Helix nemoralis collected at Chaville, near 
Paris, I found the pupae which by breeding gave a Phora described by 
M. Becker as Phora pressata n.sp. In 1912 M. Becker proposed that I should 
insert his description of this species in the second part of a paper on the life- 
history of different Phorids. Circumstances prevented me from finishing this in¬ 
vestigation and I therefore give now the description as it was sent to me in 1912. 
Phora pressata n.sp. $ $.— 
Rufa, thoracis dorso vix nitente, pilis nigris, setis dorsocentralibus duabus; 
29—2 
