346 APHIDS OF THE ROCKY MOUNTAIN REGION 
Subfamily Mindarinae Baker 
Baker, 1920a:61. 
Characters. As in genus Mindarus. 
Genus Mindarus Koch 
Koch, 1856:277; Baker, 1920a:62; Theobald, 1929:318. 
Characters. Vertex slightly convex; frontal tubercles lacking. Antenna six- 
segmented; antenna with unguis much shorter than base of VI, secondary sen- 
soria oval and transverse. Cornicle a mere ring. Cauda inconspicuous, short 
but somewhat elongate, not semilunar. Hairs simple and inconspicuous. Fore 
wing with media once-branched; radial sector arising at proximal portion of 
stigma; stigma long and tapering, reaching to tip of wing; hind wing with both 
media and cubitus. Rostrum obtuse, segment V indistinct. Sexuales small and 
apterous but with beaks and feeding; ovipara without sensoria on hind tibia; 
laying 8 or 9 eggs apiece. Living free on twigs of conifers, causing more or less 
distortion. 
Genotype (monotypical), Mindarus abietinus Koch. 
Genotype Mindarus abietinus Koch 
The Balsam Twig Aphid 
Mindarus abietinus Koch, 1856:277; Theobald, 1929:318; Patch, 1910a:242; Gillette 
and Palmer, 1934:243. 
Fundatrix. Pale yellow with dusky lateral areas; with woolly secretion posteriorly; ap- 
pendages pale except tarsi which are dusky. Body length 2; hind tibia .47-.50; antenna .66. 
Apterous Summer Vivipara. Body length 1.5; hind tibia .20-.24; hind tarsal II .10-.14; 
antenna .55, III .16-.18, IV .06-.09, V .08-.12, VI .10-.12+-.02. 
\ OMA UTM qs 
2e—. 45) (Sen. (4-33) (1b-.24) 
a ee, ae 
Witwer eaten 
Fig. 416. Mindarus abietinus 
Alate Vivipara. Brown on head and thorax, pale green on prothorax and abdomen the 
latter with dusky dorsal dashes; powdery; appendages dusky. Body length 1.5-1.9; wing 2.3; 
hamuli 2 in number; hind tibia .57-.65; hind tarsal II .18-.19; antenna .9-1.3. Rostrum at- 
taining abdominal III. Hairs pointed, and sparse. Cauda bearing one pair of short hairs. 
Ovipara. Apterous. Lemon-yellow, brown on head, dorsal abdominal patches and lateral 
areas; appendages pale to slightly dusky. Measurements as in apterous summer vivipara. 
Male. Apterous. Color as in ovipara. Body length .50; antenna .25, III and IV more or 
less coalesced; hind tibia .13; hind tarsal II .06. 
Collections. On twigs of Abies lasiocarpa and Picea pungens. Colorado: 
Laramie-Poudre Tunnel, Pingree Park and Fort Collins. Utah: Mount Timpan- 
ogos, Beaver Mountain, Wolf Creek Canyon, Card Canyon, south of Logan 
Canyon, Aspen Grove, Draper and Mount Nebo. Wyoming: Yellowstone Park. 
Fundatrices May 23, apterous and alate viviparae June 7 to Aug. 12, sexuales 
June 25; not common. . 
