202 APHIDS OF THE ROCKY MOUNTAIN REGION 
Male. Alate. Color similar to alate vivipara or brownish instead of green. Body length 
1; hind tibia .66; antenna 1.50; bearing numerous sensoria on III, IV and V. 
Collections. On leaves and stems of Artemisia frigida and tridentata. Colo- 
rado: Pingree Park, Boulder, Fort Collins, La Porte, and Loveland. Throughout 
northern Utah. Wyoming: Lyman and Le Roy. Idaho: Shoshone Falls and Twin 
Falls. Apterous summer viviparae May 27 to Dec. 3, alate viviparae May 28 to 
July 2, sexuales Nov. 2 to 10; common. 
Cotypes. Univ. of Minn. Collection. 
Epameibaphis utahensis Knowlton and Smith 
E pametbaphis utahensis Knowlton and Smith, 1936d:91. 
Apterous Summer Vivipara. Grayish green covered with numerous slightly capitate hairs 
which give whitish or grayish effect; antenna and cornicle dusky on distal portion; cauda and 
legs pale. Body length .90-1.20; across eyes .36-.40; antenna 1-1.1, occasionally one sensorium 
on III; hind tibia .53-.60; rostrum attaining 3d coxa. Cauda covered by abdominal VII and 
VIII*. 
x P AB IE ORL BE OT TT PD 9 : 
18 -.23 J9=.23" Jers2s" 41 23 S44"4t" Abdom:nal hank 
oh 
Fig. 234. Epameibaphis utahensis 
Alate Vivipara. Body length .92-1.20, across eyes .37; antenna 1.16-1.19; hind tibia .61-.64. 
Ovipara. Apterous. Same as apterous vivipara except with proximal half of hind tibia 
swollen and dark and bearing scattered large sensoria. 
Collections. On leaves of Artemisia filifolia, A, tridentata and A. vulgaris. 
Utah: Throughout state. Wyoming: LeRoy and Lyman. Colorado: Buckingham. 
Apterous viviparae April 21 to June 9, alate viviparae June 9, oviparae Oct. 12; 
rather common. 
Type. Knowlton Collection. Paratypes, U.S.N.M., Knowlton, C. F. Smith 
and Colo. Agri Exp. Sta. Collections. 
Chief Distinguishing Characters. Pale cornicle and legs and absence of sen- 
soria on III of the apterous vivipara. 
Genus Flabellomicrosiphum Gillette and Palmer 
Gillette and Palmer, 1932b:472. 
Characters. Vertex slightly convex; frontal tubercles but slightly developed, 
not noticeably exceeding vertex. Secondary sensoria circular. Cornicle merely 
a raised pore. Cauda elongate, tapering or parallel-sided; anal plate rounded. 
Hairs broadly infundibulate rather than flabellate. Wing venation as in genus 
Aphis. Rostrum with V indistinct (IV and V coalesced). Ocular tubercle indis- 
tinct. Lateral tubercles not evident. 
Genotype (monotypical), Chaitophorus tridentatae Wilson. 
Key to Species of Flabellomicrosiphum 
1, Unguis shorter than twice length of base of VI (p. 203).......:c:ccsccsssscescesesseecseceecsee tridentatae 
Unguis (2-3: times length ‘of: base of °V1 -(p)203 Vine ee eee knowltoni 
*In Wyoming at LeRoy and Lyman August 4 and at Zion Park, Utah, Sept. 7, speci- 
mens were taken which agree in all characters except that all measurements were much 
shorter. These may possibly be sexuparae since they were taken later in the summer 
than the above described specimens. 
