SUBFAMILY APHINAE 305 
OEE AD essigi (Soliman) 
Obtusicauda essigi Soliman, 1927:9 
Macrosiphum essigzgi, Knowlton and Alten: 1938c:78. 
Apterous Summer Vivipara. “Dark olive-green with metallic luster’ with dark areas at 
bases of dorsal hairs; antenna, except proximal half of III, entire cornicle, rostrum, cauda, 
anal and genital plates, and legs except proximal half of tibiae beyond knees, black. Body 
length 2-2.50; across eyes .42-.48; hind tibia 1-1.20; antenna 2-2.78, III .50-.70, IV .35-.51, 
V_ .30-.42, VI .12-.14-+-.65-78, sensoria 2-6 on III; cornicle .40-..55, reticulated area .08-.09; 
rostral IV+V .14-.17, needlelike, attaining between 2d and 3d coxae. Hairs slightly capitate; 
on vertex .05 long; on antennal III .03-.05; on hind tibia .05, slightly longer than diameter of 
tibia; on body .05 and numerous; 2-4 hairs visible on cornicle. Cauda elongate-spatulate, 
bearing 4-7 lateral pairs of hairs and one preapical one. 
Alate Vivipara. Color and measurements about the same as in apterous vivipara pacers 
sensoria 14-16 on III. 
Ovipara. Apterous. Same as apterous vivipara except hind tibia which is moderately 
swollen on proximal third, which portion is thickly covered with sensoria. 
Collections. On Artemisia tridentata, on tender tips. Colorado: Manitou, 
Grand Junction, Radium and Home. Utah: Newton, Trenton, Snowville, Black- 
smith Fork Canyon and Hansel’s Mountains. Wyoming: Casper and Chimney 
Rock (near Jelm). Apterous viviparae May 1 to September 15, alate viviparae - 
May 1 to Oct. 9, oviparae Oct. 9 to Nov. 22; not rare. 
Cotypes. Essig Collection, Box No. 231, Univ. of Calif. and L. B. Soliman 
Collections. 
Chief Distinguishing Characters. Length of. the cornicle (.41-.54), length of 
unguis (.65-.78, longer than cornicle) and dark olive-green to black body. 
Not figured on account of the close similarity to M. coweni and M. filifoliae. 
Macrosiphum filifoliae Gillette and Palmer 
Macrosiphum filifoliae Gillette and Palmer, 1928:5 and 1934:179; Knowlton and Allen, 
1938c :80. 
Apterous Summer Vivipara. Cinnamon-brown to amber-brown tinged with yellow-ochre 
laterally; cornicle, cauda, antenna beyond base of III, and tibiae, except proximal third distal 
to knees dusky to black. Body length 1.7-2.3; hind tibia 1.1-1.26; hind tarsal II .14; antenna 
2.2-2.7; rostrum with needlelike tip, attaining nearly to 3d coxa. Hairs slightly capitate; on 
side of body .05. Cornicle with reticulated area .07-.08 and with 6-8 hairs. Cauda with neck 
and tapering, bearing 6-7 pairs of lateral hairs. 
Alate Vivipara. Same as apterous vivipara except as follows: Thorax yellow-brown or 
greenish; rostrum attaining only to 2d coxa. 
On 2000 aE LSU = fern ere Soe epee prsrarea EOE: 
ry St . ser. \ (35-47) (12) Ime 
A pt. Vix CS2E 6D CS") (96 ~S2) 
Fig. 362. Macrosiphum filifoliae 
Collections. On leaves and tips of Artemisia filifolia and A. tridentata. 
Colorado: Greeley, Denver, Barnesville and Fort Collins. Utah: Woodruff. 
Idaho: 20 miles west of Castleford. Apterous and alate summer viviparae June 
20 to Sept. 18; apparently rare (host plant very rarely observed). 
This species is very close to M. coweni but appears to differ as follows: 
Length of unguis (never exceeding cornicle), hairs on cornicle 6-8 while 
coweni has 3-5 and body brown, not blackish. 
Type. U.S.N.M., No. 41974. Paratypes, Colo. Agr. Exp. Sta. Collection. 
