SUBFAMILY APHINAE wD 
anterior margin, each with one or two hairs. Hairs pointed, inconspicuous, .01-.02 long on 
antenna and body. 
Ovipara. Apterous. Head and prothorax, medially broken bands and lateral areas on 
abdomen black; antennal I, II and distal half of III, IV, V and VI, femora, knees, tarsi and 
cornicle dark; tibiae, cauda, anal plate and rostrum pale. Body length 1.7; antenna 1.30; 
hind tibia .70, proximal half or more considerably swollen and bearing numerous irregular- 
sized sensoria. Hairs simple, short and inconspicuous. Cauda knobbed but anal plate entire. 
Male. Alate. Body length 1.5; hind tibia .80; antenna 1.9. 
TP Plate 5 6 
iveta toe 
Rate Vie gee | ne i 
ae a 
RETO Pert 
$en.6-10 6073 35- 46 32-.35 aig 
®, eT se 
Hd. Tib. ,24--32 15-20 
Fig. 76. Myzocallis tiliae 
Collections. On leaves of Tilia sp. Utah: Logan, Providence and Provo. 
Alate viviparae in September and Oct. 3, oviparae Oct. 3; rather common. 
This species differs from the genotype as follows: Inconspicuous hairs on 
body of aptera and nymph, slight antennal tubercles and dilated cornicle base. 
It has been placed in several different genera by different authorities. 
Myzocallis ulmifolii (Monell) 
The Elm Leaf Aphid 
Dorsa/ TuhLerc/es 
a) ee Bey, 
Alate Viv. 
Fig. 77. Myzocallis ulmifolii 
Callipterus ulmifolii Monell, 1879:29. 
Myzocallis ulmifoliit, Gillette and Palmer, 1931:893. 
Alate Vivipara. Pale yellow to greenish, with white bordered dusky vittae on head and 
pronotum; abdomen with rows of white specks forming broken vittae, and with dusky 
speckles; legs pale; wings hyaline. Body length 1.5-1.7; hind tibia .70-.80; hind tarsal II .11; 
antenna 1.45-1.55, secondary sensoria transverse, elongate. Hairs minute; cauda knobbed; 
anal plate bilobed; cornicle obliquely truncated. Rostral IV-+V, .09 long, hardly attaining 
2d coxa. Fore wing with radial sector faint; media twice-forked. Two pairs of fingerlike 
dorsal tubercles on abdominal I and II and smaller ones on succeeding segments. 
Ovipara. Apterous. Body length 1.50, with drawn out ovipositor; hind tibia .60; antenna 
1.05; hind tibia considerably swollen along almost entire length and bearing numerous sen- 
soria. Hairs capitate and .08-.10 long on body; minute on antenna. 
Male. Alate. Body length 1.30; hind tibia .70; antenna 1.20-1.30. 
Collections. On leaves of Ulmus americana. Colorado: Fort Collins, Boul- 
der, Denver and La Junta. Wyoming: Powell. Utah: Collinston, Fielding, Provi- 
dence, Salt Lake City, Provo and Salem. Alate viviparae July 28 to Oct. 7, sex- 
uales Sept. 3 to Oct. 23; abundant at times. 
