209 
front wings nearly equal to that between this last and the stigraal 
vein; discoidals almost connected; cubital obsolete at base; subcostal 
heavy; stigma scarcely wider than subcostal space, acuminate at tip c 
and with the vein starting a little in front of its middle. Hind wings 
with the discoidals connected at base, where the subcostal is slightly 
produced. Legs normal. Abdomen showing about thirty pseudova, 
and with four dorsal rows of faint piliferous dots. Pupa with joints 
one, two, four and five of antenme subequal in length. The wingless 
forms are pale creamy yellow, with faintly dusky members. 
Missouri, Southern Texas, and Colorado (Riley). May possibly be 
popularia , Fitch, the description of which does not admit of identifi¬ 
cation. 
This gall occurs all over the West and Southwest, and while it 
normally occurs in the position and of the form described, it may 
occur on any part of the petiole, and the opening may be more or 
less oblique, or form a mere circular hole. Sometimes two and even 
three coalesee. The bp-like bulging is, however constant.” 
Pemphigus populi-ramulorum. Riley. 
“[Formiug an irregular globular gall ( populi-ramulorum ), often some¬ 
what flattened, on the twigs of Populus balsamifera in Colorado. The 
gall averages J5mm in diameter, and opens in a suture sometimes 
transverse, sometimes oblique, but more often longitudinal with the 
axis of the twig, exceptionally the opening is round and bulging. 
Green when fresh, it becomes gray and woody with age.] 
Winged female —Alar expanse 6.8mm. Black and pruinescent, 
scarcely distinguishable from populi-traversus , except by the more an¬ 
nulate antennae, the 4th, 5th, and 6th joints of which are much nar¬ 
rowed at base. The 6th joint (including subjoint), scarcely as long as 3d'. 
The pupa is yellowish, with black eyes, and pulverulent. 
Colorado (Riley). 
Several of the species of Pemphigus forming galls upon Populus so 
closely resemble each other that they could not well be seperated 
as species were it not for the differences in the galls they produce. 
Future careful investigation may show that the same species will pro- 
luce different abnormities, and be slightly modified in appearance ac¬ 
cording as it affects different parts of the plaut; but until we have 
such proof, the presumption is that the different galls are produced 
by distinct species, however similar the architects are in general ap¬ 
pearance.” 
Pemphigus acerifolii, Riley. 
“[Living in abundant and long cottony excretion, on the under sidg 
)f the leaves of Acer dasycarpum , causing them to curl, and exudine 
m abundance of thick and very glutinous “honey-dew.”] 
