18 
eertain Aleurodids that for some time I was completely deceived as 
to their true nature, which only after close examination of numerous 
specimens, in connection with its earlier stages, was disclosed. When 
seen on the leaves they are to all appearance true Aleurodids, both in 
shape and size, resembling to some extent the scale-like form of Aleu- 
rodes corni or related species. At first they are pale brownish, but 
change gradually to a dusky er black color. They are almost cireu- 
lar, flat, and rather coarsely rugose above, with the ventral side quite 
convex, and measure, when fully mature, about 0.6" in length and 
are surrounded by a rather long fringe of cylindrical, waxy rods; the 
basal one-third or one-fourth of these rods is perfectly white, while 
the remaining two-thirds or more is glassy and iridescent. ‘There is 
also a medio-dorsal group of rather long rods, identical with those of 
the lateral margin, which are curved in various ways; all of which, 
combined, give to the insect a 
peculiarly pretty appearance. 
If denuded of the waxy rods 
there is seen a continuous dou- 
ble row of stout secretory tu- 
bereles surrounding the body 
excepting the free and movable 
terminal segment. The dorsal 
tubercles are irregularly ar- 
ranged along the middle of the 
back and vary considerably in 
the number in each of the va- 
rious groups. 
Oceasionally one or two tu- 
Fa. 7.—Hormaphis hamamelidis: Third generation, bhereles or pores may be ob- 
third stage; a, dorsal view; b,antenna—much en- ; : ts 
lar ged (orien): served near the posterior mar- 
gin of the head. There are 
five to fifteen on the prothorax, six to twelve on the mesothorax, five 
to eight on the metathorax, three to five on the first abdominal seg- 
ment, two or three on the second, and one or two on the third segment. 
The antenne in this stage have become extremely minute and rudi- 
mentary, and are either one or two jointed. The rostrum is short 
and reaches but slightly beyond the anterior coxe. The legs are 
as in the larval stages. The tail is very small and knob-like, and 
bears two short bristles. The last segment is bilobed and completely 
hidden by the semicireular, penultimate segment; each lobe of it 
bears five or six bristles, arising from a smalltuberele. In this stage 
they are perfectly stationary, as in Alewrodes, and tightly cemented 
to the leaf, so that it is almost impossible to remove them without 
injury. 
Fourth and fifth generation, or the second and third Alewrodiform 
generation.—The following two generations—the fourth and fifth— 
