SUBFAMILY APHINAE 309 
Macrosiphum glabrum Gillette and Palmer 
(Plate III, 3-4) 
Macrosiphum glabrum Gillette and Palmer, (March) 1928 and 1934:182; Smith and 
Knowlton, 1937b:271. 
Apterous Summer Vivipara. Shamrock green, shining; sometimes dusky areas at bases 
of dorsal hairs in 6 rows; head dusky; rostrum especially III and IV, entire cornicle and legs 
beyond middle of femora black; cauda and anal plate dusky yellow; antenna black, paler on I, 
II and base of III. Body length 1.8-2.3; across eyes .52; hind tibia 1.6-2; antenna 2.6-3.5; 
rostrum attaining 3d coxa. Cauda tapering, or with slight constriction near base, bearing 3-4 
lateral pairs of hairs. Hairs slightly capitate; on side of abdomen .04-.05. 
Alate Vivipara. Head and thorax yellowish brown; otherwise as in apterous vivipara 
except as follows: Rostrum attaining 2d coxa, hairs on abdomen and .04 differences as shown 
in figure. 
Ovipara. Cleared and mounted specimens same as apterous vivipara in dark markings. 
Body length about 2; hind tibia 1.35; antenna 1.85-2.5; cornicle .30-.40, reticulated area .15-.18. 
Hind tibia slightly swollen on proximal third which portion bears 2-22 flat sensoria more or 
less irregular in size and often in shape. 
Male. Apterous. Green; with dark markings as in apterous vivipara. Body length 1.40- 
1.50; hind tibia 1.35-1.50; antenna 2.70-2.80, III .60-.70, IV .56-.65, V .46-.50, VI .19-++.50-.70, 
sensoria on III and IV numerous, on V only a row along posterior side; cornicle .24, with re- 
ticulated area .10; rostral IV+-V .11, surpassing 2d coxa; cauda .15 on median line, .20 on side. 
TILT ISS Patan 
POUL ee hie >Ee: se : ‘ 
RR IGR eta poke epee n tent ere 0,1 fee 
-,60) 
5S) 
(Alate ee 
i 
Fig. 367. Macrosiphum glabrum 
Collections. On leaves and flower heads of Artemisia aromatica. Colorado: 
Cherokee Park, Livermore, Eggers, Skyway, Gateway and Fort Collins; on 
Chrysothamnus viscidiflorus. Utah: Nioche. Apterous summer viviparae July 
28 to Oct. 19, alate viviparae May 17 to July 30, oviparae Sept. 23 to Oct. 19; 
rare and difficult to find due to scattered locations or solitary habit and pro- 
tective coloration. 
Type. U.S.N.M., No. 41970. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Sensoria on III weak and irregular in size 
and few in number (2-5 in apterous, 10-15 in alate vivipara), length of unguis 
(coequal or slightly shorter than III), reticulated area on cornicle unusually 
long (third or more of length of cornicle), shining shamrock-green body, rather 
short cauda (.23-.30 on median line in apterous and .30-.35 in alate vivipara) 
and small number of sensoria (about,6) on hind tibia of ovipara. 
M. alatavicum Nevsky (May, 1928a:182) on the same host plant is very 
close and possibly synonymous but the description differs in more numerous 
sensoria and shorter unguis. However, these differences may prove to be varia- 
tions in the same species. 
