500 P. W. CLAASSEN 
The fifth-stage nymph (Plate XLIV, 54) 
Length 3.35 mm.; greatest width, across wing pads, 1.61 mm. Length of antenna 1.38 
mm. The general color similar to that of the previous stage, but the head and thorax now 
distinctly patterned. Epicranial suture as in previous stages. The part of the head back 
of the epicranial suture uniformly dark red. Rostrum yellowish with brown lines on each | 
side, which meet behind the rostrum and then diverge outward until they join the brownish | 
border inside the epicranial suture, thus producing on the head four yellowish patches 
separated by the brown lines in the shapeof the letter X. Prothorax dark brown, punctate 
with circular yellow spots. From these spots, short white hairs arising. Transverse dark 
bands on the prothorax, as indicated in Plate XLIV, 54. Rest of thorax, including wing | 
pads, dark brown. The surfaces of meso- and metathorax and the wing pads punctate with 
yellowish spots, less numerous than those on the prothorax, however. The bases of the | 
wing pads indicated by light-colored, diagonal lines. The margin of the entire thorax and 
wng pads of a blackish brown color. Wing pads reaching to about the middle of the third | 
abdominal segment. Abdomen colored much as in the preceding stage. 
The adult (Plate XLIV, 52) 
Female, length 5.4 mm.; greatest width, across the prothorax, 1.5 to 1.6mm. Length 
of antenna 1.75 to 1.85 mm. General color dark brownish red. Posterior margin of head 
and area around eyes and ocelli black. Sides of rostrum black. Basal segment of antennae 
black, second and third segments of antennae yellowish brown with fuscous at the bases and 
apices, and the fourth segment dark red. Head and thorax thickly covered with dark 
punctures. Pronotum with two wavy transverse dark bands near the anterior margin. 
Corium pale yellowish brown with two black spots on the disk and four black spots on the 
inner lower margin. Legs reddish brown. Apical segments of tarsi black. Body covered 
with a very fine white pile. Male slightly smaller than female. 
Stphocoryne nymphaeae Linn.* 
Siphocoryne nymphaeae Linn., the reddish brown plum aphis, is found 
in numbers on cat-tail during the spring and summer. This species | 
also uses other water plants as its summer hosts, such as Nymphaea, 
Potamogeton, and others. The aphids are found on the surfaces of the | 
leaves from the sheath out to the tip of the leaf. The writer observed | 
this species on T'ypha latzfolia at Ithaca in 1915, 1916, and 1918. | 
Aphis avenae Fab.® 
The author found Aphis avenae Fab., the oat aphis, in large numbers, 
feeding on cat-tail, during the spring and summer of 1917, at Lawrence, 
7 Determined by Dr. Edith M. Patch. 
8 Determined by J. J. Davis. 
