420 Experiments on the Sense- Organs of Insects. [July, 
mouth it eagerly lapped the sweet. Finally the wasp flew out of 
the window. 
I removed the palpi or feelers from a female Polistes wasp, 
leaving the stumps of the maxillary palpi. It did not eat the 
sugar with its usual heartiness, but still extended its tongue 
slightly. One experiment like this proves nothing, but suggests 
that the sense of smell or taste probably resides in the tongue 
and base of the maxillz of these insects as well as in the palpi. 
A female blue mud dauber (Pelopeus coeruleus) on removal 
of the antennz showed no less activity than before and flew and 
ran about in its ordinary manner. 
A large blue-black ichneumon-fly on removal of the antenne 
was not affected much. On placing a lump of sugar at its mouth 
it eagerly lapped it, but on removing both pairs of palpi, leaving 
short stumps, it did not lap the sugar, though I repeatedly put 
it close to its tongue and actually plastered the solution on the 
tongue. I also put the insect into a cup with a solid mass of 
sugar at the bottom, but it did not eat it, having apparently en- 
tirely lost the sense of taste. In this insect it would seem as if 
the sense of taste resided in the ends of the palpi. Previous to 
their excision they moved very briskly while the ichneumon was 
lapping the sugar with its tongue. 
In walking up the side of the glass as well as on the table it felt 
its way in a peculiar tentative manner with its left fore leg, the 
short stumps of its antennz all the while moving, showing that 
the antennæ rather than the eyes are used in walking, and that 
when deprived of its antennz and eyes it uses one leg like a blind 
man his stick to feel its way. 
An ichneumon of another species on removal of its antenn® 
and of the labial and the terminal half of the maxillary palpi, 
lapped sweetened water. : 
A small Microgaster, on partial removal of the palpi, leaving 
only the stumps, acted like the larger ichneumons. 
A small brown ant on losing its antennz was at first evidently 
much shocked, turning. round and round in a confused manner, 
but in a minute or two it walked off nearly as well as ever. — It 
found its way to the rim of a goblet and lapped the sugar solution 
with its tongue, the maxillary palpi being extended straight back- 
wards. It cleaned its fore legs, drawing them through the max- 
_A number of butterflies and moths were experimented upon: 
On removal of its antenræ a Papilio Asterias flew irregularly to 
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