SUBFAMILY APHINAE 69 
Ovipara. Apterous. Brownish with dark transverse dashes or rows of spots on dorsum 
and lateral areas of abdomen; antenna, tarsi and tips of tibiae black or blackish. Body length 
3.4-4; hind tibia 2; antenna 2.50-3.25. Hind tibia with proximal half very slightly swollen 
and bearing numerous small sensoria which extend over the proximal two-thirds. 
Male. Alate. Head and thorax blackish; abdomen pale yellow fading to whitish later- 
ally and with broad dorsal bands; appendages except bases of femora blackish. Body length 
2.29; antenna 3-3.70. 
20 500,000.00) Qath Q 0 0% 6 =e polos 
Sen. 42-52 ° 71 — .88 63-83 
Fig. 69. Euceraphis gillettei 
Collections. On leaves and tender twigs of Alnus tenuifolia and Betula fonti- 
nalis. Throughout region. Alate viviparae May 29 to Aug. 24, sexuales Sept. 
29 to Oct. 20; common. 
Type. Possibly U.S.N.M. 
This species may be a variety of E. betulae (Koch), being separated appar- 
ently only by the shorter unguis in proportion to base of VI (not exceeding 
one-third of the length of base of VI while in betulae the unguis exceeds one- 
third of the base of VI). However, the variations merge together. 
Genus Monellia Oestlund 
Oestlund, 1887:44; Baker, 1920a:29; Gillette and Palmer, 1931:894. 
Characters. Frontal tubercles lacking; vertex slightly produced in alata. 
Antenna without prominent hairs; unguis not longer than base of VI; secondary 
sensoria elongate-oval. Cornicle a mere pore. Cauda knobbed; anal plate dis- 
tinctly bilobed. Hairs on body inconspicuous in alata, long and capitate in 
aptera and nymph. Differs from Myzocallis only in character of cornicle. Living 
on leave’ of trees. ) 
Genotype (monotypical), Aphis caryella Fitch. 
Genotype not described here on account of similarity, in essential generic 
characters, to caryae Monell. 
Only one species represented in region. 
Monellia caryae (Monell) 
The American Walnut Aphid 
y 
.32:-.4( Sen.6-!0 DEP 
Fig. 70. Monellia caryae 
