330 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. U , 
locate the summer food plant. It seems quite closely allied to the 
new species, sensoriata, The characters shown in figures 6 to 12 of 
the accompanying plate will serve to separate it readily from any other 
aphid known to us. 
Our records on this species are very numerous. All the young of 
the stem mother acquire wings and leave the curled leaves for some 
other food plant. The sexupara begin to return early in September, 
the males coming a little later, when the earliest born oviparous females 
are about half grown. 
r 
Aphis sensoriata, new species (Fig. 12, 13-26) 
Described from alcoholic material taken by L. C. Bragg at Log 
Cabin, Colorado, July 27, 1917, altitude 8,000 feet, and by C. P. Gil¬ 
lette, at Fort Lewis, Colorado, October 1, 1917, altitude 8,800 feet. 
In both cases the lice were infesting the leaves of Amelanchier sp. 
The July specimens are all apterous viviparous, and the October speci¬ 
mens include alate sexupara, alate males and oviparous females. 
Apterous Viviparous Female, Summer Form. The specific name is suggested 
by the presence of sensoria upon the hind tibiae of adult alate and apterous virgo- 
genia, the young apterous virgogenia and the oviparous females, and the irregularity 
of the occurrence of sensoria on the antennae, especially of the apterous virgogenia, 
where the number varies from zero to 18 on the third segment among the 10 appar¬ 
ent adults we have. 
General color some shade of green with transverse black or blackish markings upon 
the segments of the abdomen above, and a large blotch covering most of the dorsum, 
of segments 4, 5, and 6, at least. In life, the color is black or blackish throughout, 
with cornicles pale greenish yellow to blackish in the older examples; antennae, legs, 
cornicles and cauda black or dusky; beak attaining or even surpassing hind coxae; 
cornicles short (.15 mm.), and gradually tapering from base to tip; cauda short and 
broadly oval at tip, not longer than width at base; length of body, 2 to 2.25 mm.; 
width, 1.30 to 1.50 mm.; length of antenna, 1 to 1.10 mm.; joints of antenna in th& 
following proportions: I, 10; II, 8; III, 32; IV, 22; V, 22; VI, 10; spur, 27; joint III 
having from 0 to 18 oval or circular sensoria. In all but one example, the sensoria on 
joint III vary from 0 to 2, and on joint IV from 0 to 6. Hind tibia .80 mm. in length 
with numerous, small oval sensoria on the swollen basal half. Small apterous lice, 
down to 1.25 mm. in length, all have the hind tibiae swollen and with sensoria, but 
with a smaller number than the adult. Figure 19, of Plate I shows the tibia of a 
nymph that does not appear to be beyond the second moult. See figures 13 to 19. 
Alate Viviparous Female, Summer Form. Described from exam¬ 
ples taken at Log Cabin, Colorado, July 26, 1917, and at Fort Lewis, 
October 1,1917. 
General color, black or blackish throughout; basal portions of femora and tibiae 
brown; antennae, cornicles and cauda black; cornicles slightly tapering towards 
the tip and as long as hind tarsi; cauda blunt and not longer than width 
at base; antennae 1.20 mm. long, nearly attaining base of cornicles; joints of 
antennae in the following proportions: I, 7; II, 7; III, 42; IV, 26; V, 23; VI, 11; spur,. 
