102 APHIDS OF THE ROCKY MOUNTAIN REGION 
[Genotype Periphyllus testudo van der Hoeven* | 
The European Maple Aphid 
Periphyllus testudo van der Hoeven, 1863:1. 
Phillophorus testudinatus Thornton, 1852 (desc. not pub.). 
Chaitophorus testudinatus (Thornton), Baker, 1918:87. 
Periphyllus testudinatus (Thornton), Theobald, 1929:37 and 355. 
Alate and Apterous Vivipara. Dark green to gray; wings hyaline, veins not bordered. 
Body length 2.5-3; antenna shorter than body; unguis 2-3 times as long as base of VI but 
skorter than III. Hairs simple; on body moderately spinelike, .15-.25 long; on hind tibia fine, 
.13-.17 long, length 2-3 times diameter of tibia. Rostral IV-+V .12 attaining about to 2d coxa. 
Flabellate dimorphs produced, bearing six longitudinal rows of dorsal plates. Flabella broadly 
rounded. Male alate. 
Theobha/d) 
Fig. 110. Periphyllus testudo 
Host. Leaves of Acer sp. (Not recorded in region.) 
Data for description and drawings were obtained from Theobald (op. cit.) 
and from specimens determined by van der Goot. 
Periphyllus utahensis (Knowlton) 
Neothomasia utahensis Knowlton, 1928e:234. 
Periphyllus utahensis, Knowlton, 1936f:211. 
Apterous Summer Vivipara. (Mounted in balsam), antennal I, distal end of IV, entire V 
and VI, femora, knees and tips of tibiae, entire tarsi and cornicle blackish. Body 2; across 
eyes .50; hind tibia .80-.90; hind tarsal II .15-.17; antenna 1-1.3, III .34-.40-“.47,” IV .14-.22, 
V .12-.18, VI .10+.11-.15; rostral IV-+V .15-.17, attaining 3d coxa or abdominal I. Hairs 
rather spinelike; on vertex .07-.13; on antennal III and hind tibia .05; on sides of abdomen 
.06-.11 long. Cauda semilunar, bearing 4 hairs. Cornicle with reticulation. 
Alate Vivipara. Dusky brown with blackish lateral areas and crossbands on abdomen; 
cornicle and cauda black; appendages except basal part of antennal III, dusky to blackish. 
Fore wing with veins dusky and narrowly bordered, wing margins faintly cloudy. Body length 
2-2.6; across eyes .50; hind tibia .85-1.1; hind tarsal II .15; antenna 1.3-1.5, III .50-.55, IV 
.22-.28, V .17-.23, VI .09-.12+.14-.18; cornicle .10; rostral IV-+V .20, attaining abdominal III. 
Hairs rather fine; on vertex .06-.09; on III of antenna, on hind tibia and on sides of 
abdomen .05 long. 
Collections. On Salix sp., in large colonies, on leaves and bark of twigs. 
Colorado: Antonito, Manassa, Stove Prairie (near Bellvue) and near Fort 
Collins. Utah: Hyde Park, North Logan, Harrisville and Hooper. Apterous 
viviparae June 24 to Aug. 21, alate viviparae June 22 to Aug. 21; apparently 
not very common. 
Cotypes. Knowlton Collection. 
This species is close to P. macrostachyae and P. salicicorticis but differs 
from both in longer III and IV and unguis which is longer than base of VI 
(usually about 1.5 times instead of about equal). It differs from P. salicicorticis 
in darker coloration and in the feeding habit, on twigs and leaves, instead of on 
bark of larger limbs and trunk at and beneath the surface of the ground. 
*This name should be testudinacea (Fernie) (1852. Naturalist, Morris, III, p. 265) 
according to Essig (1952. The Aphid Genus Periphyllus. Univ. of California Press, 
Berkeley and Los Angeles, p. 121 and 144). Dr. Essig’s work came to hand after this 
manuscript. had been sent to the printer. 
