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Wings hyaline, the costal segment between second and third vein 
equal to or a little longer than the segment between third and 
fourth vein, while in pectoralis the former is as a rule considerably 
longer than the latter. Length 2,5—3 mm. 
This species I have bred from several snails, most often from 
young specimens of Planorbis planorbis L., and further from P. al¬ 
bus Miill. and from youngs of P. corneus L. and also from Limnaea 
ovata Drap var. peregra. The puparium of this species is much less 
altered in shape than is the case with the other two, and it is much 
shorter and thicker than the puparium of pectoralis; the ventral side 
is arched and when sitting in a Planorbis this side lies towards the 
concavity of the circumvolution, and the dorsal surface gets a hollow 
impression from the opposite wall of the circumvolution; when in 
a Limnaea the puparium sits in a similar position as Calobaea and 
the dorsal surface then also gets somewhat similar impressions, but 
to a much slighter degree, and the puparia are of about the same 
shape whether they are sitting in some Planorbis or in Limnaea. 
The species is, as seen, highly similar to pectoralis, and I should 
scarcely have been aware of the difference, had not the pupæ been 
so totally different; this difference was, however, not a sufficient 
reason for separating the two species, as it might well be thought 
possible that the same species, when pupating in various snails, 
might get a various shape of the puparium. A close examination 
gave, however, the result that the species was separated from pec¬ 
toralis by a couple of constant characters. While pectoralis has a 
black stripe along the upper margin of the mesopleura to the wing- 
root, we find in punctatus here a well defined black spot just below 
the anterior notopleural bristle, and this character is quite constant 
in my whole material (10 males and 10 females); further the lateral 
yellow stripe on thorax is more pronounced than in pectoralis, in- 
cluding the whole præsutural depression, while in pectoralis the 
upper part of the depression is black. The character given for the 
wing is also generally well expressed, but, however, less valid as 
there may in this respect be a little variation in both species. The 
species is upon the whole smaller than pectoralis. — When examin- 
ing the specimens in our old collection of pectoralis, which Zetter- 
stedt had seen, I found them to be the present species, but as 
Zetterstedt says: „Pleurae rufo-flavae, vitta laterali fusca plerumque 
