298 APHIDS OF THE ROCKY MOUNTAIN REGION 
Type. Knowlton Collection or U.S.N.M. 
This species is very close to M. essigi and M. filifoliae; indeed it is rather a 
connecting link between these two species, especially in respect to length of 
unguis and cornicle (the former varying from longer than to shorter than the 
latter). The only difference appears to be in relative length of antennal III 
which is greater than length of either unguis or the cornicle and in body color 
which is apple-green to bluish-green. This species appears structurally identical 
with M. zerothermum (Knowlton and Allen) except in the capitate instead of 
pointed hairs. 
Macrosiphum chrysanthemi (Oestlund) 
Nectarophora chrysanthemi Oestlund, 1887 :84. i 
Macrosiphum chrysanthemi, Hottes and Frison, 1931a:302; Gillette and Palmer, 1934: 
174. 
Apterous Summer Vivipara. Dark brown; cornicle black throughout; cauda yellow to 
slightly dusky; antenna dusky, paler on II and base of III; tibiae pale’ to brownish. Body 
length 2.25-3; hind tibia 2-1.85; antenna 2.8-2.95; rostrum surpassing 2d coxa. Hairs blunt to 
slightly capitate; on side of abdomen .04. Cauda slender, spatulate with rather acute tip, 
bearing 4-6 pairs of lateral hairs and 1-2 dorsal preapical ones. 
92 yy 
03) 
(Agee Co.’ 
(10-13) 689 
— 
(Sen. 7-7 B) 
ibe: ho RSE EB A 
alata 98 Oe okesheee Len 8S. 2 Cass re ey Data RSE) 
Fig. 355. Macrosiphum chrysanthemi 
Alate Vivipara. Same as apterous vivipara except as follows: Rostrum merely attaining 
2d coxa; hairs on hind tibia .03-.04 and on side of abdomen .03. 
Ovipara. Apterous. About the same as apterous vivipara except hind tibia the proximal 
two-thirds of which is distinctly swollen to nearly twice the diameter of narrowest portion and 
bearing numerous sensoria which extend for three-quarters of length of tibia. 
Male. Alate. Body length 1.80-2; hind tibia 1.40; antenna 2.83, sensoria about 40 irregu- 
larly arranged on III, about 8 in single row on IV and V each; cornicle .30, apical reticulated 
area .10; cauda .13 on median line. 
Collections. On Bidens sp. Colorado: Fort Collins. Utah: Blacksmith Fork 
Canyon and Honeyville. Apterous viviparae June 30 and Aug. 5 to Sept. 19, 
alate viviparae June 30 and Aug. 5 to Sept. 2, sexuales Sept. 19; not common. 
Type. Univ. of Minn. Collection. 
Chief Distinguishing Characters. Dark brown body, length of the reticu- 
lated area on cornicle (.15-.18), numerous sensoria on III (33-37) in alate vivi- 
para and 4 pairs of lateral hairs on cauda. 
Macrosiphum cockerelli Hottes 
Hottes’ Green Goldenglow Aphid 
Macrosiphum rudbeckiarum (Cockerell), (misidentification), Hottes, 1949a:47. 
Macrosiphum cockerelli Hottes, 1950c:100. 
Apterous Summer Vivipara. “Pale green’ with all appendages pale except antenna 
beyond III, tarsi, tips of tibiae and of cornicle and rostral III and IV+V dusky. Body length 
3.10-4.50; across eyes .60-.63; across head anterior to eyes .45; hind tibia about 4; antenna 
about 6; rostrum attaining between 2d and 3d coxae. Cauda cylindrical to tapering, bearing 
5-6 hairs on each side and 1-2 dorsal preapical ones. 
Alate Vivipara. Same as apterous vivipara except as follows: Body length 3-3.6; across 
eyes .58; hind tibia 3.2-3.5; rostrum hardly attaining 2d coxa. 
Ovipara. Color about same as apterous summer vivipara. Body length 2.6-3; antenna 
about 4.50, III .95-1.10, IV .80-1.10, V .75-.95, VI .20-.23-++-1.20-1.40, sensoria 3-7 on III; 
