316 APHIDS OF THE ROCKY MOUNTAIN REGION 
It seems strange that the same species should occur on such a variety of 
hosts but the specimens from other hosts than Eriogonum and Helenium seem 
not to be available for examination. Two apterae on the paratype slide belong to 
another species. 
Macrosiphum mentzeliae Wilson 
Nectarophora sp. Cowen (in Gillette and Baker), 1895:124, line 36. 
Macrosiphum mentzeliae Wilson 1915a:99; Gillette and Palmer, 1934:188. 
Apterous Summer Vivipara. Head pale yellowish; body medium to pale green sometimes 
pink; with reddish dorsal blotch; cauda and anal plate pale; cornicle dusky to blackish beyond 
proximal half; appendages pale, becoming dusky at tips. Body length 2.5-3; across eyes .50; 
hind tibia 1.8-2; hind tarsal II .13; antenna 2.5-3; rostrum attaining 2d coxa. Hairs slightly 
capitate; on side of abdomen .04. Cauda parallel-sided to tapering, rather stout, bearing 4 
pairs of lateral and one preapical dorsal hair. 
Alate Vivipara. Head pale brownish yellow; thoracic lobes yellowish brown; prothorax 
and abdomen medium to pale green with reddish dorsal blotch; antenna beyond base of III, 
terminal segments of rostrum, cornicle beyond proximal third which is dusky, tarsi and tips 
of tibiae black; cauda and anal plate pale. Otherwise same as apterous summer vivipara 
except as follows: Body length 2.3-2.8; rostrum attaining hardly to 2d coxa and hairs slightly 
shorter. 
Apt. , eae 
Vi. C54 - bas Gen, 25 =) 43 -.50 
IONE ee; wI2=63 
Hgts) nA Mig 
Fig. 377. Macroeaiane mentzeliae 
Ovipara. Apterous. Pinkish yellow to pale green, darker on dorsum of abdomen; antenna 
beyond base of III, cornicle at tip, tarsi, tips of 1st and 2d tibiae and entire hind tibia black- 
ish; cauda and anal plate pale yellowish to pinkish. Measurements same as in apterous sum- 
mer vivipara except that cauda is shorter, .20 on median line, Proximal two-thirds of hind 
tibia slightly swollen and thickly covered with convex sensoria. 
Male. Alate. Head and thorax dark brown; abdomen yellowish brown with dark dorsal 
crossbands and lateral areas; appendages as in alate vivipara. Body length about 2; cauda .15 
on median line. 
Collections. On leaves of Mentzelia sp. Colorado: Fort Collins. Utah: Lo- 
gan. Apterous summer viviparae May 26 to Oct. 8, alate viviparae June 2 to’ 
Oct. 12, males Oct. 2 to 12, oviparae Oct. 11 to 25; rather common. 
Type. Granovsky Collection. 
Chief Distinguishing Characters. Body color (light to medium green often 
with pink dorsal blotch or sometimes pink in general), length of cornicle (equal 
to antennal III or slightly longer), relatively short cauda (less than half length 
of cornicle), length of hairs on hind tibia (hardly equal to diameter of tibia), 
short extent of reticulation on cornicle (about fifth of length of cornicle), rather 
long rostral IV+-V -(.16-.18, slightly longer than hind tarsal II) and number of 
sensoria on III (2-3 in apterous and 12-20 in alate vivipara). 
Macrosiphum mertensiae Gillette and Palmer 
Macrosiphum mertensiae Gillette and Palmer, 1933:361 and 1934:189. 
Apterous Summer Vivipara. (Mounted on slide), pale throughout body, anal plate and 
cauda; legs pale except distal ends of tibiae and entire tarsi which are dusky; cornicle pale 
with distal third slightly dusky; antenna pale with distal portion of IV and entire V and VI 
dusky; rostrum pale with only tip dusky. Body length 2-3; across eyes .50-.53; hind tibia 
