78 APHIDS OF THE ROCKY MOUNTAIN REGION 
Apterous Summer Vivipara. Color same as fundatrix. Body length 2.5; hind tibia 1.8; 
hind tarsal II .20; antenna 3; rostrum rather broad, obtuse, attaining 3d coxa. Hairs on body 
.05-.08, somewhat spinelike; on antenna fine, length about equal to or 1.5 times diameter of 
III. Imbrications on antenna and cornicle finely denticulate. 
Ovipara. Apterous. Body length 2.8; antenna 2.50. Abdomen somewhat drawn out to 
form ovipositor. Proximal half of hind tibia slightly swollen and bearing sensoria. 
Male. Apterous. Dusky brown. Body length 1.95; hind tibia 1.1; antenna 2, 
Collections. On bark of twigs of Betula fontinalis and Betula sp. Colorado: 
Fort Collins, Boulder, Estes Park, Stove Prairie (near Bellvue) and Crawford. 
Idaho: Mink Creek. Utah: Woodruff. Fundatrices April 7, apterous summer 
viviparae June 2 to Oct. 7, alate viviparae June 2 to Aug. 9, oviparae Sept. 25 to 
Oct. 13, males Oct. 15; fairly common. 
Type. U.S.N.M., No. 42819. Paratypes, Colo. Agr. Exp. Sta. Collection. 
From N. americanus (Baker) this species is separated by the shorter unguis 
(equal to base of VI in americanus). 
Genus Oestlundiella Granovsky 
Granovsky, 1930:63. 
Characters. Frontal tubercle distinct but not greatly enlarged. Antenna 
longer than body; secondary sensoria subcircular, present on III of alate and 
apterous viviparae. Cornicle truncate with enlarged distal end and with dis- 
tinctly mammiform base. Cauda spatulate; anal plate with U-shaped cleft. 
Hairs inconspicuous, blunt or slightly capitate. Fore wings with radial sector 
evident, media twice-forked. Body somewhat woolly. Living on leaves and 
twigs of trees. 
Genotype (monotypical), Euceraphis flava Davidson. 
Only one species represented in region. 
Genotype Oestlundiella flava (Davidson) 
The Alder Aphid 
a S 2 \ 
5 1.05.- 1-50 Sen, 2-12 \; Ting T é DN EES 
A/ate Viv .60- 70 30 = 4G PR Nocera f 
4 0 
Q 83- 1,17 en. t=4- se TI pt TT IY. 
0 0,0 OP %0B 2 9090 2S.2050692, 5995009 9 po 2, 0000 6 ; J» 
cee 
Fig. 81. Oestlundiella flava 
Euceraphis flava Davidson, 1912:406; Knowlton 1929a:4. 
Oestlundiella tlava, Gillette and Palmer, 1931:903. 
Alate Vivipara. Pale yellow; more or less woolly; with cornicles and a pair of dorso- 
lateral vittae from head to abdomen dark brown; lateral areas on abdomen dusky; cornicle 
black; cauda pale; antenna annulated; legs pale dusky with tips of tibiae and entire tarsi 
black. Wings hyaline, stigma pale. Body length 3.3; hind tibia 2.5-3.2; hind tarsal II .20; 
antenna 4; rostral IV+V .11, attaining between 1st and 2d coxae. Hairs inconspicuous. 
Ovipara. Apterous. Yellow; with 2 pairs of dorsal to lateral longitudinal rows of dark 
brown spots; with tufts of long threads on venter of abdominal V and VI. Body length 1.6-2; 
hind tibia 1.1-1.9; antenna 3. 
Male. Alate. Dorsum of head and prothorax light dusky. Color markings similar to 
alate vivipara. Body length 1.5-1.9; hind tibia 1.60-1.65; antenna 3.4. 
