SMICRONYX WEEVILS—ANDERSON 30D 
Males Females 
Mean Extremes Mean Extremes 
Body length 2.85 2. 30-3. 00 2.94 2. 80-3. 20 
Elytra length 2.00 1. 60-2. 20 2.00 1. 80-2. 20 
Elytra width at base 1.07 0. 86-1. 22 1.09 1. 00-1. 22 
Prothorax length 0.71 0. 56-0. 83 0.76 0. 69-0. 83 
Prothorax width 0.82 0. 63-0. 92 0.84 0. 79-0. 92 
Rostrum length 0.94 0. 83-1. 00 1,14 1. 06-1. 25 
Rostrum length before antennal 0.37 0. 33-0. 40 0.60 0. 59-0. 66 
insertion 
Funicular segment 2 length 0.064 0. 051-0. 085 0.072 0. 068-0. 085 
Funicular segment 3 length 0.045 0. 034-0. 051 0. 051 
Brotocy: Tuttle (1951) reported finding S. fulwus breeding in the 
flower heads of Helianthus annuus Linnaeus and finding the adults 
on the flowers of Heliopsis helianthoides Linnaeus in central Illinois. 
Schwitzgebel and Wilbur (1942) reported collecting this species on 
ironweed (Vernonia interior Small) in early August at Manhattan, 
Kansas. The records of the host plants which follow were taken 
from the material examined: ‘On sunflower,” Urbana, IIl., Sept. 5 
(USNM); “sunflower head,” Wichita, Kans., Aug. 12 (USNM); 
“‘on Helianthus sp.,”” Oklahoma City, Okla., Aug. 1 (USNM); “‘sun- 
flower,” Sikeston, Mo., Sept. 29 (USNM); “‘fls. Helzanthus,”’ Boulder, 
Colo. (USNM); ‘fon wild sunflower,” Sierra Ancha Mountains, 
Ariz., Oct. (CAS); “‘sun-flower,”’ Bountiful, Utah, Sept. 15 (USNM); 
“on sunflower,” The Dalles, Oregon, Aug. 9 (USNM); ‘‘Rudbeckiae 
flowers,” Tryon, N. C. (USNM). 
Discussion: This species bears a closer resemblance to S. sordidus 
LeConte than to the other species of the S. fulvus group, in general 
body shape and proportions, straightness of the rostrum, size and 
shape of scales (small and elliptical), and shape of genitalia (compare 
figs. 96, 97). However, the two species may be readily distinguished 
by the fulvous scales, absence of a smooth median line on the 
prothorax, and ferruginous femora of S. fulvus, as opposed to the 
gray or white scales, distinct smooth median line on the prothorax 
and piceous femora of S. sordidus. 
DisTRIBUTION: Present records indicate that S. fulvus has a 
very generalized distribution, which extends from the western 
Appalachian highlands across the interior plains region, the Rocky 
Mountain system and the basin and range province to (but not 
beyond) the Pacific mountain system. The following specimens 
were examined: 
ALBERTA: Medicine Hat, Aug. 16 (USNM). 
ARIZONA: GILA co.: Sierra Ancha Mountains, Oct. (CAS). YAVAPAI Co.’ 
