SUBFAMILY APHINAE 313 
Separation of this form from M. valerianae appears, at present, impossible. 
However, on account of the radical difference in host plants kiowanepum is here 
retained as distinct awaiting further biological evidence of synonymy with 
valerianae. 
This form is very close to M. pseudorosae, apparently differing only in the 
slightly longer cornicle which is usually longer than or at least equal to antennal 
III while in pseudorosae cornicle is usually shorter than or at most equal to III. 
Macrosiphum longirostris Gillette and Palmer 
Macrosiphum longirostris Gillette and Palmer, 1933:360 and 1934:186. 
Apterous Summer Vivipara. Light green without dark markings; antenna beyond base 
of III, tips of tibiae, tarsi and distal third of cornicle dusky; cauda pale to slightly dusky. 
Body length 2-3; across eyes .46; hind tibia 1.55-1.75; antenna 2.4-2.6; rostrum attaining 3d 
coxa or abdomen. Secondary sensoria strongly convex but hardly tuberculate. Hairs on 
vertex and antenna slightly capitate or blunt; on sides of body slightly capitate, .03 long. 
Cauda slender, tapering to acute point, bearing 4 pairs of lateral hairs and 1-2 dorsal hairs, 
about 4 of the terminal ones blunt to slightly capitate. 
Fig. 373. Macrosiphum longirostris 
Alate Vivipara. Head and thorax brown; abdomen light green without markings; an- 
tenna beyond base of III, cornicle beyond proximal one-fifth, rostral IV-+V and legs beyond 
middle of femora black; cauda and anal plate pale green. Body length 2-3; across eyes .44; 
hind tibia 1.60-1.75; antenna 2-3. Otherwise as in apterous summer vivipara. 
Collections. On head and underside of leaves of Cirsium filipendulum. 
Colorado: Fort Collins. Apterous and alate viviparae July 28 and Sept. 5; ap- 
parently not common. 
Type. U.S.N.M., No. 49289. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Long rostral IV-+-V (.24, twice as long as 
base of antennal VI or hind tarsal II), tapering, acute cauda with straight capi- 
tate hairs near tip, long reticulated area (.25-.35) on the cornicle, numerous 
sensoria on III and light green immaculate body. 
Macrosiphum ludovicianae (Oestlund) 
The Dark-leaved Wormwood Aphid 
Siphonophora ludovicianae Oestlund, 1886:23. 
Nectarophora ludovicianae, Oestlund, 1887 :80. 
Macrosiphum ludovicianae, Soliman, 1927:117; Hottes and Frison, 1931a:315; Gillette 
and Palmer, 1934:187; Knowlton and Allen, 1938c:81. 
Fundatrix. Same as summer aptera except as follows: Antenna 2.4; cornicle .50 with 
reticulated area .20; cauda .30 on median line. 
Apterous Summer Vivipara. Yellowish slate-green or pale grape-green; slightly pulveru- 
lent; antenna greenish to dusky on I, II and base of III, blackish or black beyond base of III; 
tarsi, rostrum beyond middle of II, especially on IV+V, and cornicle beyond dusky base 
black; cauda and anal plate yellowish to dusky; tibiae blackish. Body length 2-2.5; across 
eyes .45-:50; hind tibia 1.65-1.75; antenna about 4; rostrum attaining 3d coxa. Hairs slightly 
capitate to blunt; on side of body .06. Cauda spatulate, bearing 7-8 lateral pairs of hairs and 
4-5 dorsal ones. 
Alate Vivipara. Head and thorax dusky green; otherwise as in apterous summer vivipara 
as described above except hairs slightly shorter and differences shown in figure. 
Ovipara. Apterous. Similar to apterous vivipara except often more pinkish on body. 
Proximal half of hind tibia slightly swollen, hardly twice diameter of narrowest portion and 
rather thickly oovered with numerous sensoria. 
