212 BARON WALCKENAER ON THE INSECTS 
M. Duponchel that after the progress which had been made by the 
united efforts of French and German naturalists in this branch of ento- 
mology, we could not recognise a butterfly which had been twice drawn 
and described by skilful naturalists, and which must be common, since 
its caterpillar was so. To this M. Duponchel replied that he thought 
I was mistaken in supposing myself certain of having distinguished the 
caterpillar described by Bose, because the description given of it by 
this naturalist in his memoir is so far from precise that it may be ap- 
plied to all the caterpillars of this genus which have green bodies and 
black heads, but which differ in other characters of which he does not 
speak, such, for example, as the colour of the verrucose points with which 
all the caterpillars of this group are decorated. As to the butterfly, the 
description and figure by Bosc, the description by Fabricius, and Coque- 
bert’s figure, drawn from the individual described by Fabricius in Bose’s 
collection, may equally be applied to the four following species of 
Phalenz : the Cerasana and Riberana of Treitschke, and the Corylana 
and Fasciana of Fabricius. ‘The last approaches more nearly than 
the others to Bose’s description ; but this species is also described by 
Fabricius, and Bosc has not recognised it as his own. Still more, after 
saying that Réaumur had not anywhere mentioned the caterpillar which 
was the subject of his memoir, he adds: “ It appears to be equally rare 
in other climates, for neither Linneus, Fabricius, nor Scopoli has de- 
scribed the Phalzenze which it produces.” 
From these researches and explanations it appears that if the Pyralis 
Danticana, Pyralis Vitana of Fabricius, has not been confounded by him 
and Bose with the Fasciana; that if it be not the same species as the 
latter, it must be considered as a species still unknown, and which can- 
not be well known until we have bred all the caterpillars found upon 
the vine which resemble the one described by Bose. To deduce this 
deficiency in science is almost to acquire the certainty of its being 
speedily supplied. Although the silence of the Italian naturalists rela- 
tive to this caterpillar be not a decisive reason for thinking that it is not 
found in Italy, and did not receive from the ancients the name of Jn- 
volvulus, yet this is more especially true with regard to another cater- 
pillar to which the names Convoluudus and Involvulus appear more 
peculiarly applicable. More attentive observations: have been made 
upon this caterpillar than upon that described by Bose, and its butter- 
fly is well known as the Procris ampelophaga, or Procris of the vine so 
much dreaded by all the cultivators of Tuscany. ‘This caterpillar some~ 
times injures considerably the buds and young shoots of the vine. In — 
Piedmont: it sometimes devours half the vine-plots. It is five or six — 
lines in length, and two lines or two and half in width; its colour is a 
brown gray, and the hair is disposed in stars in four longitudinal rows 
in semi-globular relief towards the anterior part. The inferior surface 
