oo 
THE STUDY OF INSECTS. 
The various forms of antennae are designated by special 
terms. The more common of these forms are represented 
in Figure 74. These are as follows: 
1. Setaceous (se-ta'ceous) or bris¬ 
tle-like, in which the segments are 
successively smaller and smaller, the 
whole organ tapering to a point. 
2. Filiform (fil'i-form) or thread¬ 
like, in which each segment is of 
nearly uniform thickness throughout 
its length; and the antenna as a 
whole tapers gradually, if at all, to¬ 
wards the tip. 
3. Moniliform (mo-nil'i-form) or 
necklace-form, in which the segments 
are more or less globose, suggesting 
a string of beads. 
4. Serrate (ser'rate) or saw-like, 
in which the segments are triangular, 
and project like the teeth of a saw. 
5. Pectinate (pcc'ti-nate) or comb-like, in which the seg¬ 
ments have long processes on one side, like the teeth of a 
comb, or on both sides, like a feather. 
6. Clavate (cla'vate) or club-shaped, in which the seg¬ 
ments become gradually broader, so that the whole organ 
assumes the form of a club. 
7. Capitate (cap'i-tate) or with a head, in which the 
terminal segment or segments form a large knob. 
8. Lamellate (jam'el-late), in which the segments that 
compose the knob are extended on one side into broad 
plates. 
The Mouth-parts .—No set of organs in the body of an in¬ 
sect vary in form to a greater degree than do the mouth-parts. 
Thus with some the mouth is formed for biting, while with 
others it is formed for sucking. Among the biting insects 
some are predaceous, and have jaws fitted for seizing and 
Fig. 74.—Various forms of an¬ 
tennae. 
