SUBFAMILY APHINAE 215 
Collections. On leaves or stems of Typha latifolia. Colorado: Fort Collins. 
Utah: Murray. Apterous summer viviparae July 11 to Oct. 8, alate viviparae 
Aug. 5 to 17, sexuales Oct. 8 to Oct. 30; not common. 
Type. Ill. Nat. Hist. Surv., Collection, No. 10719. 
This species is very close to R. fitchii but differs as follows: Color of body, 
somewhat longer unguis, thicker cornicle, longer hind tibia of ovipara and habit 
of wintering on Typha latifolia. 
This form varies slightly from the original description of R. enigmae in 
smaller body, shorter antenna and cornicle, and more numerous sensoria in the 
alate vivipara. The limits of variation, however, of the two forms meet or over- 
lap so that the erection of a distinct species for the Rocky Mountain form seems 
hardly justifiable. 
Rhopalosiphum fitchii (Sanderson) 
The Apple Grain Aphid (Plate VI) 
Aphis mali Fabricius (misidentification), Fitch, 1855:49 (or 760); Weed, 1893:299. 
Aphis fitchii Sanderson, 1902:137. 
Aphis avenae Fabricius (misidentification), Matheson, 1919:750. 
Aphis prunifoliae Fitch (misidentification), Baker, 1917b:410. 
Rhopalosiphum prunifoliae, Baker and Turner, 1919a:311; Theobald, 1927:72; Gillette 
and Palmer, 1932b:486. 
Fundatrix. Uniform yellowish green to whitish or with darker green markings in form 
of median line, cross dashes, and lateral margins with head and prothorax pale, often whitish; 
cornicle pale to brownish with black tip; cauda pale greenish yellow; appendages pale to 
sordid yellow with blackish tips and tarsi. Measurements as in summer aptera or a little 
larger. 
a s Alate = Apt. 
[eos ee SZ t Cale 
A ae is gd as £ 
18-25 
0 atin, Seg >| = 9 D0, 9 xo! = 
58 ON °2 909 P% 000 Co 
‘ ey O80: g 
@ A5=J8 re ac Q re as = 
Fig. 252. Rhopalosiphum fitchii 
Apterous Summer Vivipara. Young. Early instar, dull apple-green often tinged with 
carneous about and occasionally between cornicles; head dusky brown; two pairs of dorso- 
lateral and one of lateral setigerous spots, on each segment, extending over thorax and abdo- 
men; antenna pale proximally, dusky distally; legs pale. Cornicle short, broader than long. 
Adult. Yellowish green with darker green mottlings and with head and pronotum brownish 
and with orange area about cornicle base and on abdominal V and VI; cornicle sordid yellow 
to brownish and with black tip. Body length 1 to 2; hind tibia .90-1.10; antenna 1.1-1.4; 
rostrum obtuse, attaining 2d coxa. 
Alate Vivipara. Alatotd Nymph. Pale apple-green, darker on dorsal bands and median 
line of abdomen, with orange stain at base of each cornicle; a pair of tessellated spots on 
abdominal I, II, III and IV. Adult. Head and thorax black; yellowish to olive-green, mot- 
tled, and with dusky lateral areas and slight median bands on abdominal VII and VIII and 
sometimes V and VI; and dusky blotch posterior to each cornicle base, sometimes rusty 
coloration anterior to cornicles; cornicle and legs pale or slightly dusky with black tips; 
antenna dusky throughout. Body length 1.4-1.8; hind tibia .90-1; hind tarsal II .11; antenna 
1.1-1.4, secondary sensoria convex. Frontal tubercles distinctly produced mesally, but hardiy 
exceeding vertex, which is convex. Hairs pointed, sparse, drooping. Cornicle cylindrical to 
slightly vasiform, slightly narrowed in middle and distinctly constricted just before the 
prominent flange, faintly imbricated; appearing weak, hardly wider in middle than hind 
tibia, somewhat impinged against body. Cauda elongated, parallel-sided, rather acute, slightly 
