SUBFAMILY APHINAE a7 
viviparae June 17, dimolts Sept. 23, oviparae Sept. 27; rare, but usually 
abundant where found. 
Type. U.S.N.M., No. 42816. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Short hairs on hind tibia and antenna 
(length of the longest hardly exceeding diameter of segment bearing them) 
and comparatively short rostral IV-+V (.12-.13, shorter than base of VI). 
This species agrees with Symydobius Mordvilko in the short hairs but with 
Periphyllus in the cornicle and anal plate. 
~ 
Periphyllus bruneri (Williams) 
The Black Cloudy-winged Poplar Leaf Aphid 
Chaitophorus bruneri Williams, 1910:25; Davis, 1911b:6. 
Periphyllus bruneri var. of populicola, Gillette and Palmer, 1931:925. 
Apterous Summer Vivipara. Polished dark brown or black with segment lines pale and 
little or no trace of the pale V or Y pattern; legs black throughout. 
Alate Vivipara. Head and thorax dark brown or black; abdomen yellowish to brewn, 
with dark bands; cornicle pale. Fore wing with veins conspicuously bordered with blackish. 
Hind wing with media and cubitus faintly bordered. Measurements and structural characters 
same as in P. populicola. Nymph. Rusty-brown and showing the Y pattern. 
Collections. On leaves and twigs of Populus tremuloides and P. angusti- 
folia, rarely on P. tacamahaca. Throughout region. Apterous viviparae April 
25 to Sept. 8, alate viviparae June 21 to Aug. 25; common. 
Cotypes. Univ. of Nebraska, No. 25 and U.S.N.M., No. 38. 
Same as typical P. populicola excepting that the coloring is much darker. 
Apa 4 
Periphyllus lyropictus (Kessler) 
The Norway Maple Aphid 
Chaitophorus lyropictus Kessler, 1886:171. 
Chaitophorus aceris Linnaeus (misidentification), Gillette, 1909c:387; Davis, 1910d:414. 
Periphyllus lyropictus, Hottes and Frison, 1931a:170; Hite Ris Lambers, 1947:228. 
Apt. 12-18 
ne (* JU e00000"e Za TE ITE 52 
Alate 6 3.68 Sen.10 SESASS .29 -.36 Alate=Apt 
Fig. 105. Periphyllus lyropictus 
Apterous Summer Vivipara. (Mounted in balsam), body pale; cornicle, tarsi, tips of 
tibiae and of antennal IV and V and entire VI dark. Body length 2.70; hind tibia .95-1.20; 
hind tarsal II .15; antenna 2.23; rostral IV+V .12, attaining 2d coxa. Hairs spinelike on 
vertex; on body of two kinds, some fine and .10 long and others heavy, spinelike, .20-.28 long. 
Cauda semilunar; cornicle nearly cylindrical and reticulated on distal half. 
Alate Vivipara. Same as apterous vivipara except as shown in figure. Wings hyaline. 
Ovipara. Apterous. (Mounted in balsam), body pale: tarsi, tips of tibiae and of antennal 
IV and V and entire VI dark. Body length 2.3-2.8; antenna about 2.13, III .60-.66, IV .35-.39, 
V .30-.31, VI .11+.50-.55; cornicle .18; hind tibia 1-1.15 long, moderately swollen for nearly 
entire length and bearing numerous tuberculate sensoria; otherwise as in apterous vivipara. 
Male. Alate. Same as alate vivipara except as follows: Length of body 1.7 and presence 
of numerous sensoria on III, IV and V. 
Collections. On Acer platanoides and A. saccharum. Utah: Logan. Alate 
viviparae June 4 and Sept. 18, apterous viviparae June 4 to Oct. 12, sexuales 
Sept. 24 to Oct. 23; rare. 
