SUBFAMILY APHINAE 293 
ends of segments, dusky to blackish. Body length 1.5-2; across eyes .49; antenna about 2, 
III .50-.58-*'.67,”" IV .30-.36, V .26-.35, VI .13-+-‘.37-.45,"% sensoria 2-6 on III; cornicle .43-.50, 
reticulation extending .06-.08 from tip; hind tibia 1.02-1.10-“1.14”; hind tarsal II “.12”-.14-.15; 
cauda on median line .25-.32, bearing 5 pairs of hairs; rostrum with needlelike tip, IV+V .13- 
-16 long, attaining 3d coxa. Hairs pointed; on vertex .05; on antennal III .04, equalling diam- 
eter of III; on hind tibia .05, slightly longer than diameter of tibia; on abdomen .05 and quite 
numerous; 3-7 on cornicle, Cauda slender-spatulate. 
Collections. On Artemisia tridentata. Utah: Little and Big Cottonwood 
Canyons. Apterous viviparae April 24 and July 10; rare. 
Type. U.S.N.M. or Knowlton Collection. 
Chief Distinguishing Characters. Numerous fine, spinelike hairs on the 
body; dark areas at bases of hairs, length of reticulated area (.06-.08) on corn- 
icle. 
Not figured on account of close resemblance to M. zerothermum. 
Macrosiphum artemisiphilum Knowlton and Allen 
Macrosiphum artemisiphilum Knowlton and Allen, 1938c:75. 
Apterous Summer Vivipara. (Cleared and mounted on slide), body without markings; 
antenna beyond proximal part of III, cornicle and tibiae black; cauda and tip of rostrum 
dusky. Body length 1.75-2-‘‘2.8’; across eyes .45; antenna about 3; hind tibia 1.30-1.50; ros- 
trum attaining 3d coxa. Hairs blunt to slightly capitate; on side of abdomen .04 long. Cornicle 
reticulated at tip and bearing 1-3 hairs. 
Viv. sen. 3-10 52 8 
: “i WA HIV VT ey 
Apt sy SRE 
Prats ‘40-50 
ESO TIn RS "45" 55 
ws 
fAlate Hd.tib. j aH | : C45 ~ 50 15 55 -.63 
Fig. 347. Macrosiphum artemisiphilum 
ASS.54 
$0 "57-.20" 6O- “85 
Alate Vivipara. “Green to blackish green.”’ (Mounted on slide), body without markings; 
antenna beyond base of III, cornicle and tip of rostrum and legs black; cauda dusky. Body 
1.65-2; across eyes .43-.45; antenna 1.55-1.80; hind tibia 1.30-1.50; cornicle bearing 1-3 hairs. 
Cauda slender-spatulate bearing 5-6 hairs on each side. 
Collections. On Artemisia tridentata. Utah: Blue Creek, Cedar Spring and 
Blue Spring Mountains and Stansbury Island. Alate and apterous viviparae 
May 3 to June 8; rare. 
Type. U.S.N.M. or Knowlton Collection. 
Chief Distinguishing Characters. Rather shallow frontal tubercles in ap- 
terous vivipara, number of sensoria on III (fewer than 10 in alate and not more 
than 3 in apterous vivipara), short cornicle (not longer than antennal III), short 
extent of reticulation on cornicle (.06-.08), presence of hairs on cornicle and 
length of unguis (shorter than twice the length of cornicle). From M. essigi it 
differs only in the fewer sensoria. 
Macrosiphum artemisivulgaris Knowlton and Allen 
Macrosiphum artemisivulgaris Knowlton and Allen, 1938c:76. 
Apterous Summer Vivipara. ‘“‘Whitish green.” (Mounted on slide), pale; cornicle, tarsi, 
tips of tibiae and,antenna beyond base of III black; cauda and tibiae dusky to blackish. 
Body length about 2-‘‘2.35”; across eyes .47; antenna about 3; hind tibia 1.70-“1.92”’; rostrum 
attaining about to 3d coxa or ‘“‘to abdomen.” WHairs on body sparse, without dusky areas at 
bases, slightly capitate and .045 long; on hind tibia heavy spinelike, .03-.05 long, about equal 
to diameter of tibia. Cauda slender, slightly spatulate, bearing about 7 hairs on each side. 
Collections. On Artemisia aromatica and A. vulgaris. Utah: Smithfield 
Canyon. Apterous viviparae Aug. 21 and 24. 
Type. U.S.N.M. or Knowlton Collection. 
