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 i^rovided Avith 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, No. 1 [fig. 4, i]. 



Fig. 5. — Leonardiua lahiUei, showing wax rods. (Redrawn from Leonardl.) 



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 otlier 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 geniLs Aleyrodes at their extremity in not 



