LEONARDIUS LAHILLEI. 37 
These zones we can segregate into two categories according to their 
dimensions and both, as regards the longitudinal diameter of the 
body, are arranged in perfect symmetry. The number of the major 
zones is seven pairs, arranged as follows: One pair situated in the 
cephalic region, one pair upon the second abdominal segment, another 
pair upon the fourth abdominal segment, and the others distributed 
per pair upon each of the succeeding rings. The second and the 
third pairs represent the most conspicuous zones and are character- 
ized by presenting toward the center the mouth of a thick wax- 
producing gland provided with a robust chitinous conical process, 
more or less curved, upon which is placed the long waxy filament 
formerly described. The succeeding zones decrease in size succes- 
sively as we proceed backward toward the posterior extremity. 
The zones of the second series are, as has already been stated, 
much less conspicuous and are distributed chiefly in the cephalic 
region, as can be observed by examining figure 2, Xo. 1 [fig. 4, 1]. 
Fig. 5. — Leonardius luhiUei, showing wax rods. (Redrawn from Leonardi.) 
Parallel to the margin of the body, a short distance therefrom, 
runs all around a corona of short cilia which are symmetrically 
distributed. Another pair of cilia occupy also the thoracic seg- 
ments, and another pair the cephalic region. The segments of the 
abdomen present a few mouths of minute wax-producing glands 
which are disposed in rows, sometimes single, sometimes double. 
The anal aperture shows the operculum of rather large size, its 
width slightly exceeding its length, furnished with a conical lingula, 
obtuse at the apex, and furnished near the end laterally with two 
pairs of rather long bristles that are quite robust. Another pair of 
hairs that are less conspicuous is attached to the operculum, one at 
the right and the other at the left of the base of the lingula. 
In regard to the venter, the insect presents no particular features 
except the rudimentary legs, which differ from those generally 
noted in the forms of the genus Aleyrodes at their extremity in not 
