


1914] Pemphigine Attacking Populus In Colorado. 65 
Young larve. 
The rather young larve of this species taken on Ranunculus are 
pale green in color and are heavily covered, especially over the abdomen, 
with fluffy wax threads. For full descriptions see Davidson’s paper in 
Journal of Economic Entomology, 1910. 
Pupz on Ranunculus, pale yellow in color and very heavily covered 
with wax threads, especially over the abdomen. 
Compared with A ffints. 
This species is very close to affinis Kalt. of Europe, but 
seems to be distinct, and especially because of what seem to be 
rather marked differences in the antenne. I have but a single 
European example of the alate fall migrant, sent me by Mr. 
J. J. Davis, from Dr. Tulgren, of Sweden. 
I have found only six wax plates on the vertex of the funda- 
trix in twelve examples examined, while Tulgren gives eight 
for affinis; joint IV of the antenna is somewhat shorter in pro- 
portion to the other joints as compared with affinis in Tulgren’s* 
figures, and joint V in the fall migrant commonly has two or 
three sensoria, while affinis is represented as having none. 
Sexupara of affints. 
We have a good example of affinis from Europe, sent by 
Dr. P. van der Goot. Joints V of the antenne have each one 
good transverse sensorium near the middle and one very small 
sensorium besides; joint IV has four well developed transverse 
sensoria on each antenna and is decidedly club shaped, being 
much heavier at the distal end. The same form of condupli- 
folius has joint IV more nearly cylindrical and usually with 
four well developed transverse sensoria, joint V usually with 
none but sometimes with one or two small sensoria, and joint 
VI with none. 
The antenna of the virgogenia seems to agree with that of 
affinis as figured by Tulgren. 
Asiphum sacculi n. sp., Plate XV, Figures 10 to 14. 
I first saw the gall of this louse about eighteen years ago 
when.on a mountain trip some twenty miles or more northwest 
of Fort Collins. I did not meet with it again until the present 
summer, when, on July 13th, I found two of the leaf pockets 
characteristic of this species in Estes Park on twigs of Populus 
tremuloides about six miles'apart and at an altitude of about 
*Aphidologische Studinen for Zoologi, 1905, Band 5, No. 14. 
