ew 
1914] Pemphigine Attacking Populus In Colorado. 63 
leaves to fold along the midrib as shown at figure 5, b. Mr. 
Maxson in a letter makes the following statement in regard to 
his observations upon the early occurrence of the second brood: 
“The first larve of the second generation were observed 
June 18th. These were traced to the young leaves at the tips 
of the branches where they located on the underside. These 
leaves began to fold along the midrib and in a few days typical 
P. conduplifolius galls were formed.”’ 
This second brood all acquire wings and leave the cotton- 
woods and go to the buttercups, Ranunculus sp., so far as our 
observations go. At the present writing, December 24th, 
there are several thrifty colonies in the laboratory on butter- 
cups where they have been since the migrants were put upon 
the plants in July. They attack, not the roots, but the crown 
and leaves and stems near the ground. The buttercup seems 
to be a permanent food plant for this species, upon which it 
seems to be able to live continuously throughout the year. 
COLLECTION DATA FOR FUNDATRIX. 
Specimens in the collection have been taken as follows: 
Ft. Collins, Colo., 6- 2-13, L. C. Bragg, Populus occidentalis 
; “ 6-12-13, L. C. Bragg, 2 - 
= S “ ~ 6-16-13, L. C: Bragg, “ i 
. . “6-20-13, L. C. Bragg, . A 
Denver, Colo., 6-25-13, L. C. Bragg, q us 
Fundatrigenia. 
The winged fundatrigenia taken from the folded poplar 
leaves is the form described by Mr. J. H. Cowen in Bulletin 31 
of the Colorado Experiment Station, page 115, as follows: 
‘““Length 1.8 to 2.2mm. Alar expanse 6.85 mm. Nearly black, 
pruinose. The abdomen is deep green when the glaucus matter is 
removed by placing the insect in alcohol. Antenna 1.00 mm. long, 
joints slender, 5th and 6th with about six or seven annulations each;. 
stigma short and broad; ungues usually with a constricted neck. Similar 
to ramulorum but larger and the antennal joint not nearly so strongly 
annulated.”’ 
In addition it might be said that the transverse sensoria (Figure 7) 
_are not complete rings, many of them extending but a short distance, 
and especially is this true on joint III; on joint IV the number commonly 
varies between five and eight, and the same is true of joint V, while the 
number on joint VI is usually six besides the terminal or permanent 
one; spur, finger-like and about .05 in length, or about one-half as long 
as joint II; joints I and II equal in length, the former cylindrical, the 
