60 APHIDS OF THE ROCKY MOUNTAIN REGION 
transverse, unguis of VI much shorter than base. Eye not protruding. Cauda 
semilunar or knobbed. Tarsal I triangular in lateral aspect. Fore wing with 
radial sector curved, media twice-branched and not faint. Ovipara often alate; 
producing several eggs. Living exposed or in folded leaves, usually protected 
by flocculent secretion. 
Key to Genera of Phyllaphina 
1. Secondary sensoria transverse; antenna with transverse rows of denticles; fore wing 
with media arising proximad of stigma; ocular tubercle evident. (p. 61)................ Tamalia 
Secondary sensoria not transverse; absent on apterous vivipara; antenna not with 
denticles; fore wing with media arising from stigma; ocular tubercle not 
evident:- (p. 60)" 05 SR ee ee ee ee Stegophylla 
Genus Stegophylla Oestlund 
Oestlund, 1922:146; Gillette and Palmer, 1931:885. 
Characters. Frontal tubercles lacking. Antenna six-segmented; not notice- 
ably setose, nor with evident hairs; II distinctly longer than I and approximately 
coequal with IV in apterous forms; unguis much shorter than base of VI; sec- 
ondary sensoria circular. Ocular tubercle not evident. Cornicle a mere ring on 
a low conical base. Fore wing with media simple or twice-branched* and aris- 
ing from the stigma. Cauda broader than long and rounded; anal plate entire in 
all forms. Male usually alate but sometimes apterous and with antenna bearing 
sensoria; all other forms apterous. Ovipara apterous and laying many eggs. 
Summer forms covered with flocculent material. Living exposed on leaves and 
twigs or in folded leaves of Quercus sp. 
Genotype (monotypical), Phyllaphis quercicola Baker. 
Key to Species of Stegophylla 
1. Hind wing with two cross-veins; rostral IV-+V .08-.10 long. (p. 60).................-. quercicola 
Hind wing with one cross-vein; rostral IV+V .13 long. (p. 61)....................-....- quercifoliae 
[Genotype Stegophylla quercicola (Monell) ] 
Callipterus? quercicola Monell, 1879:31 (desc. of male). 
Phyllaphis querci (Fitch) (misidentification), Davis, 1911c¢:242. 
Phyllaphis quercicola Baker, 1916e:362. 
Stegophylla quercicola, Gillette and Palmer, 1931:885; Hottes, 1934:8 (synonymy). 
ah bee oe 
Cornicle After Davis) 
Fig. 59. Stegophylla quercicola 
Apterous Vivipara. Pale greenish or yellow to brownish with heavy flocculence; legs 
pale greenish; abdomen with six longitudinal rows of wax glands. Body length 1.0; across 
eyes .22; antenna .40-.60, usually six-segmented but often five-segmented; hind tibia .40; hind 
tarsal II. 09; rostral IV+V .08-.09, attaining hardly to 2d coxa. Hairs inconspicuous. Cornicle 
merely a dusky ring. Cauda subobsolete, rounded; anal plate rounded. 
Ovipara. Apterous. About the same as apterous vivipara except with hind tibia bearing 
circular sensoria on considerably swollen proximal two-thirds. 
Male. Alate or apterous. Fore wing with media simple or once-branched. Body length 
2.6; hind tibia .50-.56; hind tarsal II .11; antenna .83-.90, secondary sensoria minute; rostral 
IV+V, .07-.10 hardly attaining 2d coxa. 
Host. Quercus agrifolia and Q. wislizenii, exposed on leaves and twigs or 
in galls on edges of leaves. (Not recorded in region.) 
*Oestlund, in his original description of the genus, says ‘“‘Mediae of fore wings with 
only one branch” but Davis, (1911c:242) states and figures venation of media as vary- 
ing from two-branched to simple. Baker (1916e:362) applied the name quercicola n. n. 
to the insect described by Davis in above- mentioned reference. Davis’ description is 
accordingly used as basis for the generic description here given. 
