SUBFAMILY APHINAE 297 
antenna 3.6-4.6; rostrum surpassing 2d coxa. Hairs slightly capitate; on side of abdomen 
-03-.05. Cornicle with reticulated area .10 long. Cauda tapering, rather broad, bearing 3-5 pairs 
of lateral hairs and 1-2 single dorsal preapical ones. 
Alate Vivipara. Head and prothorax pale green; thoracic lobes yellow-brown; cornicle 
dusky, occasionally lighter at base; appendages brownish, darker at tips of segments and 
entire antennal VI; cauda and anal plate pale. Otherwise as in apterous vivipara except 
rostrum merely attaining 2d coxa and hairs slightly shorter. 
Ovipara. Apterous. Head pale brownish yellow; body pale green mottled with light 
coral-red; appendages brownish. Proximal third of hind tibia swollen to twice diameter of 
narrowest portion and thickly covered with sensoria. Otherwise as in apterous vivipara. 
i Apt, Hd Alate 
Male. Alate. Head and thorax blackish brown; abdomen pale green with black cross- 
bands and lateral areas; antenna dusky proximally, beyond base of III blackish; legs and 
cornicle brownish with blackish tips; cauda dusky. Body length 2; cornicle .80; antenna with 
about 30 sensoria on III, 0 on IV, 20 on V. Otherwise as in alate vivipara. 
Collections. On Salix lutea, S. amygdaloides and S. sp. Throughout Colo- 
rado and Utah. Apterous summer viviparae June 15 to July 31 and Aug. 14 to 
Oct. 23, alate viviparae July 2 and Aug. 20 (rarely found), sexuales Oct. 15 to 
24; not common. 
Cotypes. Essig and Colo. Agr. Exp. Sta. Collections. 
Essig (1917:328) considers this species as Clarke’s M. californicum though 
Clarke’s description in measurements of the antenna differs radically from this 
form and his types do not exist to correct the concept of the species in case of 
error in description. 
Chief Distinguishing Characters. Pale yellowish body with median and 
lateral lines of green, small number of sensoria on III of the alate vivipara 
(5-10), long cornicle (more than 1 long, about 1.3 times the length of antennal 
III), short extent of reticulation on the cornicle (.10), few hairs on cauda and 
rather short cauda (about .30-.35 on median line, only about half of the length 
of antennal V). 
Macrosiphum cefsmithi Knowlton and Allen 
Macrosiphum cefsmithi Knowlton and Allen, 1938c:76. 
(Y= .64-78) 
(=. Steves 5 
€ .62-.85) 
(74.80) S 
Cats NN ne a re A rene 
sae ee | (19-21) 4-7 -1.67) 
Fig. 353. Macrosiphum californicum 
Fig. 354. Macrosiphum Pefenithi 
Apterous Summer Vivipara. “Shiny apple-green to darker green and bluish green’; 
antenna, except base of III, cornicle, cauda, anal plate, rostrum, tarsi and tips of tibiae black; 
tibiae, except tips, dusky. Body length “1.6’’-1.8; across eyes .46-.48; antenna 2.20-2.40, III 
.60-.67, IV .33-.43, V .36-.45, VI .13-.15-+“*.48”-.63, sensoria 0-4-‘‘5” on III; cornicle ‘‘.47-.59,” 
bearing 2-4 hairs, reticulated area ‘‘.03”-.05-.09 long; cauda .23 on median line, ‘.28-.35”’ long 
on side; rostral IV+V .14-.16. Cauda spatulate, bearing 4-5 pairs of lateral hairs. 
Collections. On Artemisia tridentata. Utah: Curlew Valley, Cedar Spring, 
Showell and Rattlesnake Pass. Apterous viviparae April 30 to May 13; appar- 
ently rare. 
