SUBFAMILY APHINAE 291 
Alate Vivipara. Head dusky or brownish; thoracic lobes brown; prothorax and abdomen 
bluish green; pulverulent; antenna dusky beyond base of III; cornicle, cauda and tibia yellow- 
ish to dusky, with tarsi and tips of tibiae blackish. Measurements as in apterous vivipara 
except as follows: Hind tarsal II .16-.18; rostrum attaining 2d coxa. 
Ovipara. Apterous. (Mounted in balsam), body without dusky markings; appendages as 
is apterous vivipara. Body length 3; antenna about 4; cauda .35 on median line, .41 on side; 
hind tibia hardly swollen but thickly covered with small sensoria on half to two-thirds of 
length. 
Male. Alate. Head and prothorax yellowish brown, meso- and meta-thorax dark brown; 
abdomen yellow to olive-brown; antenna dusky; cornicle, tibiae and cauda sordid yellow. Body 
jeneth 33 rated tibia 2.5; antenna 5. 
057-7 (16--22) + 
60-90 id 17-22 
.90-1.30 
: 9 S1.10(s€n 33- ‘ 
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j Viv. .96- ED = 
Alate .70~.95 At 07 75-60 
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73 -.87 20-.2 
Fig. 345. Macrosiphum albifrons 
Collections. On leaves of Lupinus sp. Colorado: Cherokee Park, Estes 
Park, Mesa Lakes (on Grand Mesa) and foothills near Fort Collins. Utah: 
Panguitch. Apterous summer viviparae July 1 to Sept. 17, alate viviparae July 
19 to Aug. 15, sexuales Sept. 6 to 21; not common. 
Type. U.S.N.M. Paratypes, Essig and Colo. Agr. Exp. Sta. Collections. 
Chief Distinguishing Characters. Rather numerous sensoria (19-40) on 
III of apterous vivipara and (30 or more) in alate vivipara, moderate amount 
(.10-.15) of apical reticulation on cornicle, rather long rostral IV+V (.17), 
rather numerous (7-8) pairs of lateral hairs on cauda and length of IV (dis- 
tinctly shorter than III). 
Macrosiphum ambrosiae (Thomas) 
The Brown Ambrosia Aphid 
Siphonophora ambrosiae Thomas, 1877 (1878) :4. 
Tritogenaphis kosacaudis Knowlton, 1928d:79; Smith and Knowlton, 1937:271 (synony- 
my declared). 
Macrosiphum ambrosiae, Hottes and Frison, 1931a:298; Gillette and Palmer, 1934:172. 
Red Color Variety: Nectarophora solidaginis (Fabricius) (misidentification), Cock- 
erell, 1903b:167. : ’ 
Macrosiphum solidaginis (Fabricius) (misidentification), Gillette, 1911c:383; Davis, 
1911a:34. 
Siphonophora solidaginis, Williams, 1910:86. 
Macrosiphum ambrosiae, Color Variety, Gillette and Palmer, 1934:172. 
Apterous Summer Vivipara. Light to dark brown or sepia, with dusky areas about hair 
bases (most distinct in cleared specimens); cauda and anal plate pale; legs more or less 
dusky; cornicle and rostral III, IV and V entirely black; antenna dusky to black but paler on 
I, II and base of III. Body length 2.50-3.50; hind tibia 2.15-2.9; antenna 3.30-4.20; rostrum 
fully attaining 3d coxa. Hairs blunt to slightly capitate; on side of abdomen .04-.06. Cauda 
tapering to rather acute point and without definite constriction and bearing 7-8 pairs of lateral 
and dorsolateral hairs and several dorsal hairs. 
Alate Vivipara. Color and measurements same as in apterous vivipara except as follows: 
Thoracic lobes dark brown; dark blotch on abdominal VI posterior to base of each cornicle; 
dusky spots at bases of hairs often reduced or lacking; antenna entirely black; rostrum hardly 
attaining 3d coxa. Hairs on side of abdomen .03. 
Ovipara. Apterous. Same as apterous vivipara except hind tibia which is slightly swollen 
on slightly more than proximal half and bearing numerous small sensoria. 
