SUBFAMILY APHINAE 203 
Flabellomicrosiphum knowltoni Smith 
Flabellomicrosiphum knowltoni Smith (C.F.), 1937:128. 
Apterous Summer Vivipara. Dull slaty to pinkish, overlaid with numerous pale infundi- 
bulate or funnel-shaped hairs which give a frosted appearance; dusky to black markings (still 
apparent in cleared and mounted specimens) as follows: Head, distal portion of base of 
antennal VI, and I, rostrum, coxae, trochanters, entire femora, especially 2d and 3d pairs, 
tarsi, cornicle, anal plate, ventral spot on abdominal VII and cauda; entire tibiae pale. Smith 
(op. cit.) says “hind tibia dusky in life; antenna pale excepting above mentioned portions.”’ 
Body length 1.1-1.3; across eyes .34; antenna .83-1.05; hind tibia .53-.70; rostrum attaining to 
or slightly beyond 2d coxae. Hairs on vertex and body funnel-shaped or infundibulate, appear- 
ing flabellate on casual observation, .04-.05 long and numerous; on appendages simple; on 
III .01, reclinate and sparse; on hind tibia .03. 
15-22 sen.o-1 ‘1 -AS 
Hd. i 
es aun) alg Be 
Bo 
Hairs 
an 
Aes 
t : 
sexoparadd W2-18 08-1 10-14 07-69 14-20 
CE gee tee ES 
Alate Viv. (After Smith) *.09 4. ee Hd. Tib. Viv. Ha STib, 
UIE SAAT arrears) (A variation) 
Laat @ hu sen. 5 4 ou 20 
Fig. 235. Flabellomicrosiphum knowltoni 
A collection taken July 30, comprising 7 adults and 2 nymphs with antenna slightly short, 
about .80, but agreeing in all other described characters with the above, showed strongly 
curved reclinate, spatulate hairs on all tibiae, in adults and even in the nymphs; though in 
the latter on the hind tibia some longer more erect simple hairs were scattered among the 
spatulate ones. 
Most of the specimens taken in August, (sexuparae?) are smaller. Body length .95-1.1; 
antenna .62-.67 and hind tibia .38-.47. The tibial hairs were simple but finer than in first 
above-described viviparae. 
Alate Vivipara. Same as aptera or darker in color. Body length 1.4; antenna 1.19; hind 
tibia .77; hind tarsal II .11; rostrum as in aptera. 
Collection. On Artemisia tridentata. Utah: Source of Logan City drinking 
water system (in Logan Canyon), Salt Lake City, Cedar Valley, mouth of 
Mueller’s Park, Spring City, Brigham, Bountiful and Roy. Apterous viviparae 
April 25 to Aug. 23, alate viviparae July 30 to Aug. 23; rare. 
Type. U.S.N.M. RArALy DES, Knowlton, C. F. Smith and Colo. Agr. Exp. Sta. 
Collections. 
Chief Distinguishing Characters. Slaty color of body, color of coxae, tro- 
chanters and femora (dusky to black), length of unguis (longer than twice base 
of VI). 
Genotype Flabellomicrosiphum tridentatae (Wilson) 
Chaitophorus tridentatae Wilson, 1915a:89. - 
Flabellomicrosiphum tridentatae, Gillette and Palmer, 1932b:472; Smith (C.F.), 
1937 :127. 
Apterous Summer Vivipara. Pale green; covered with white funnel-shaped hairs, giving 
frosted appearance; antenna pale proximally, dusky distally; cauda greenish or slightly 
dusky; legs pale; tarsi black. Body length 1-1.4; hind tibia .45-.55; antenna ‘‘47”-.65-.80; 
rostrum acute, IV-+V tapering, laterally compressed, tip beyond hairs needlelike in ventral 
aspect, surpassing 2d ,coxa. 
‘Fig. 236. Flabellomicrosiphum tridentatae 
