SUBFAMILY APHINAE 327 
ments as apterous summer vivipara except as follows:,/ Antenna 2.5-3.4; rostrum attaining 
between 2d and 3d coxae and hairs slightly shorter. 
Ovipara. Apterous. Same as apterous summer vivipara except as follows: Hind tibia 
1.6-2, proximal half slightly swollen and bearing numerous scattered sensoria. 
Male. Apterous, Color same as in forms described above. Body length 1.7; hind tibia 
1-1.2; antenna 1.3-2; cauda .10 on median line. 
Egg. Newly laid, pale yellow-green; later, shining black. Size .87 by .37. 
Collections. On leaves and stems of Taraxacum officinale. Throughout re- 
gion. Fundatrices April 3 to 29, apterous and alate summer viviparae May 6 to 
Nov. 17, oviparae Oct. 6 to Nov. 17, males Oct. 5 to Oct. 22; very numerous in 
large colonies on infested plants; common. 
LCL uae 
7) A u ; 
eT : -4 
gi ieee 
nen . 
Alate Viv=Art, Soa a. 
c 
CB .25-.35 Tet.06 
Fig. 391. Macrosiphum taraxaci 
Chief Distinguishing Characters. Dark red-brown body with black appen- 
dages and anal plate, relatively short cauda, (but little longer on median line 
than hind tarsal II), rather long rostral IV-+-V (longer than hind tarsal II), nu- 
merous sensoria on III in both alate and apterous viviparae, long blunt to capi- 
tate hairs on hind tibia in both alate and apterous viviparae and length of 
reticulated area on the cylindrical to slightly tapering cornicle (.15-.20 long). 
Macrosiphum tenuitarsis Gillette and Palmer 
Macrosiphum tenuitarsis Gillette and Palmer, 1933:363 and 1934:198. 
Apterous Summer Vivipara. Apple-green; cauda and anal plate pale green; cornicle 
black, paler at base; antenna with I, II and base of III pale, remainder dusky to blackish; 
tibiae and top of restrum dusky to blackish. Body length 2.5-3, slender; hind tibia 2.35-2.75; 
antenna 4-4.3, secondary sensoria circular, slightly convex, but not tuberculate.. Cornicle 
coarsely and longitudinally reticulated to .18, finely and transversely reticulated to .25 or ,27 
from tip; rostrum obtuse, surpassing 2d coxa. Hairs on vertex blunt, on hind tibia pointed, 
about .04 long; on side of abdomen blunt. .04 long. Cauda parallel sided or with slight neck 
on proximal half and tapering on distal half ending with slender acute tip, bearing 5-6 lateral 
and dorsolateral hairs on each side and 2-6 dorsal ones. 
Tp Hh ) fi} yk T's, ez 
Ay dp Pp yP WW VPI OEs 
Fig. 392. Macrosiphum tenuitarsis 
Alate Vivipara. Head, prothorax, meso- and metathorax yellowish brown; abdomen 
apple-green with dusky green on median line; cauda and anal plate pale greenish; other 
appendages black except antennal I and II and base of III pale, base of cornicle dusky and 
rostrum pale to dusky up to distal IV-+V with black tip. Otherwise as in apterous summer 
vivipara except rostrum barely attaining 2d coxa. 
Ovipara. Apterous. Color similar to apterous vivipara. Body length 2-2.5; antenna 
2.9-3.2; cauda .40 on median line, .50 on side. 
