SMICRONYX WEEVILS—ANDERSON 295 
tate, shining in female. Antennae rufous, the scales whitish. Head 
black, finely alutaceous, bearing a dense patch of scales above base of 
rostrum. Prothorax black to piceous, moderately rounded at sides, 
moderately narrowed toward apex; closely covered with rounded punc- 
tures; scales white, elliptical; prosternum moderately emarginate, not 
concave. 
Elytra entirely rufous; intervals thinly covered with elliptical white 
scales, humeri elevated. Underside of thorax and abdomen brown, 
thinly covered with ovate, white scales. Femora rufous, covered with 
elliptical, white scales. Tibiae rufous, scales white, elongate and 
elliptical. Tarsi rufous; third segment much broader than first two; 
claws black, connate at their bases, moderately divergent. Sides of 
median lobe of male genitalia subparallel, internal sac heavily covered 
with small, broad spines at sides; spiculum gastrale hooked at anterior 
end (fig. 80). Arms of spiculum ventrale of female genitalia forming 
a V; stem slightly dilated at anterior end (fig. 130). 
Measurements: The following measurements were taken from 3 
males and 1 female from Garden City, Kans. (USNM), 4 males and 
5 females from Mesa Co., Colorado (CNHM), 3 males and 4 females 
from Lyleton, Manitoba (CNC). All measurements are in millimeters: 
Males Females 
Mean Extremes Mean Extremes 
Body length 2. 20 1. 90-2. 60 2.24 2. 00-2. 40 
Elytra length 1. 60 1. 40-1. 90 1.57 1. 40-1. 70 
Elytra width at base 0. 84 0. 73-1. 03 0.81 0. 76-0. 89 
Prothorax length Ox51 0. 43-0. 59 0.51 0. 43-0. 56 
Prothorax width 0. 58 0. 49-0. 69 0.56 0. 49-0. 63 
Rostrum length 0. 81 0. 66-0. 92 0:90 0.79-1..03 
Rostrum length before antennal 0. 31 0. 26-0. 33 0.46 0. 40-0. 53 
insertion 
Funicular segment 2 length 0.066 0.051-0.068 0.070 0. 068-0. 085 
Funicular segment 3 length 0.036 0.034-0.051 0.041 0..034-0. 051 
Broutoey: The host-plant records which follow were taken from the 
material examined: “Host Iva ranthifolia,” Lyleton, Man., Aug. 23 
(CNC); ‘on sunflower,” Garden City, Kans., May 22, 26, 29 (USNM); 
“on Xanthium,” Salt Lake, Utah, June 21 (USNM); “‘Salsola pestifer,”’ 
1 mile south of Chama, N. Mex., July 18 (USNM); “Russ. thistle,”’ 
Moffat Co., Colo., July 24 (CM); “sugar beets,” Elsinore, Utah, Aug. 
5 (USNM); “alfalfa blossom,’”’ Lethbridge, Alberta, June 23 (CNC). 
Discussion: This species and S. utilis Buchanan resemble each 
other in body shape and proportions, punctation of the prothorax, and 
scale color. However, as pointed out by Buchanan (1941), the rostra 
and elytra of S. commiztus are distinctly reddish, while the same 
structures are black or nearly so in S. utilis. Although the male 
