ENTOMOLOGY. 
81 
forwards. Maxillae are sometimes Wanting, (as 
among many dipterous lame,) but when present they 
are placed immediately under the upper jaws, and 
are more or less subservient to mastication. They 
are generally without the lobes which distinguish the 
corresponding parts of the imago, but there is, for the 
most part, a palpiform process, analogous to the in- 
ternal maxillary palpus, or what is called galea in the 
orthoptera. Palpi exist in all larvse save dipterous 
and hymenopterous ones, but they are often short 
and inconspicuous. The maxillary palpi are some- 
times four in number, at other times only one is at- 
tached to each maxilla; the labial palpi are always 
limited to two. Their shapes are conical, setaceous 
or filiform ; the joints variable in number, and not 
unfrequently branched. The upper lip presents 
nothing peculiar, but the under lip, in the tribe of 
dragon-flies, ( Libellulidae , ) assumes a very singular 
form, as will be seen when we come to specify the 
peculiarities of the order Neuroptera. In connection 
with the under lip, there is an instrument peculiar to 
some larvae, namely, a spinneret — a small conical tube 
through which the silken threads are drawn, which 
are so indispensable to the economy of a large pro- 
portion of them. The antennae are far from presenting 
that variety of design and beauty of structure which 
render them, not unfrequently, very ornamental ap- 
pendages to insects in a state of maturity. They are 
often entirely wanting, (as in the maggots of many 
two-winged flies, bees, &c.) and frequently so minute, 
that even when they do exist, they cannot easily be 
F 
