30 CLASSIFICATION OF THE ALEYRODID^. 
In the median dorsal area, all around, there are a large number of 
mouths of wax-producing glands, collected in six distinct groups, of 
which three are arranged at the right and three at the left of the 
longitudinal diameter of the body of the insect. The middle group 
on the right, as well as that on the left, is quite distinct from the 
contiguous groups, of which the two anterior ones, as well as the two 
posterior ones, unite respectively at the anterior apex and at the 
posterior apex of the body of the insect, at which points these groups 
are of their smallest width. The wax secreted by these wax-pro- 
ducing glands is that which goes to form the above-recorded six 
waxy tentacles. Other glands of similar nature, symmetrically dis- 
posed, are found spread out upon the tegument comprised between 
the groups of which Ave have just spoken, but such glands are want- 
ing, with the exception of the row of circummarginal glands already 
described, on the part of the tegument outside of the principal groups. 
The anal aperture, as compared with that of the preceding species, 
is much smaller in size, and the operculum which covers it is, in com- 
parison, much wider than long, the length being scarcely more than 
one-half of the width. The lingula, by its shape and by the number 
and disposition of the sightly hairs with which it is ornamented, 
resembles that of the preceding species except that the dimensions 
are proportionate to those of the respective operculum. 
As regards the venter the insect presents no special features except 
the legs which : like those of Aleurodkus lahillei, carry at their apex 
a robust claw rather than a pulvillus. 
Length of body 1.500 mm.; width of body 1.120 mm.; length of 
the waxy tentacles about 5 mm. ; width of the waxy tentacles about 
0.5 mm. 
Adults. — Not known. 
Habitat. — Collected at Jalapa, in Mexico, upon the leaves of a plant 
the species of which is undetermined. 
The insects, for the most part collected in numerous colonies, are 
ordinarily attached to the sides of the middle vein of the leaf, dis- 
posed alternately on the one and the other side of this vein, forming 
in their totality an elegant design which shines upon the verdure of 
the leaf, thanks to the perfect whiteness of the waxy tentacles which 
arise from the bark of the insect. 
Dialeurodicus tessellatus n. sp. 
(PI. VI, fig. 1; PL VII. fig. 2.) 
From (Vara. Brazil, on Eugenia mitcKelli. Received January, 
1906, from Mr. F. Richa. This species in the pupal stage closely re- 
Bembles D. cocherellii^ but differs in the character of margin of ease, 
in the vasiform orifice, absence of wax pores on dorsum, and darker 
color of eggs and pupa ease. 
