318 PROCEEDINGS OF THE NATIONAL MUSEUM Von. 118 
Elytra black, convex; scales ovate, 2-3 rows per interval, very 
pale gray toward sides of elytra, medium yellowish brown in a broad 
sutural stripe and along outer margins. Underside of thorax and 
abdomen black, thinly covered with ovate pale gray scales. Femora 
moderately clavate, ferruginous, covered with ovate and elongate 
yellowish gray scales. Tibiae rufopiceous, covered with elongate 
eray scales. Tarsi black, third segment much broader than first two; 
fourth segment only slightly exceeding third; claws connate near 
their bases, slightly divergent, outer claws distinctly shorter than 
inner claws on midtarsi and hindtarsi, but longer than inner claws on 
foretarsi. Median lobe of male genitalia nearly parallel at sides; 
internal sac not exceeding the median lobe, covered with fine spicules 
(fig. 90). 
Measurements: The following measurements were taken from 6 
males and 6 females from Kimball, Nebr. (B. D. Valentine), 1 male 
from Garden of the Gods, Colorado (CU), and 1 female from ‘‘Ariz.’’ 
(USNM). All measurements are in millimeters: 
Males Females 
Mean Extremes Mean Extremes 
Body length 2. 00 1. 80-2. 20 2.08 1. 90-2. 30 
Elytra length 1. 39 1. 25-1. 50 1.38 1.30-1. 55 
Elytra width at base 0. 78 0. 69-0. 89 0.82 0. 76-0. 92 
Prothorax length 0. 52 0. 46-0. 59 0.56 0. 53-0. 66 
Prothorax width 0. 59 0. 53-0. 66 0.66 0. 63-0. 73 
Rostrum length 0. 73 0. 66-0. 83 1.01 0. 92-1. 06 
Rostrum length before antennal 0. 27 0. 26-0. 30 0.52 0. 46-0. 56 
insertion 
Funicular segment 2 length 0.061 0.051-0.068 0.065 0. 051-0. 068 
Funicular segment 3 length 0. 034 0.041 0. 034-0. 051 
Brotocy: The single host-plant record which follows was taken 
from the collection of B. D. Valentine: ‘On Coreopsis sp.,’? Kimball, 
Nebr., June 22 (35 specimens) B. and B. Valentine. 
Discussion: The differences between this species and S. griseus 
are given in the discussion of S. griseus and in the key on page 315. 
S. pleuralis was found to be represented by very few specimens in 
collections, but the Kimball, Nebraska, material collected by B. D. 
Valentine in 1953 consisted of 35 specimens. 
DistrispuTion: The few existing records indicate that S. pleuralis 
may be found in the southern Rocky Mountains and on the western 
border of the Great Plains. The ‘‘Ariz.’’ record could have come from 
either the southern portion of the Colorado Plateau or the basin and 
range province. The following specimens were examined: 
ARIZONA: ‘‘Ariz.”’? (USNM). 
CoLORADO: EL PASO Co.: Garden of the Gods, July 5 (CU). 
NEBRASKA: KIMBALL COo.: Kimball, June 22 (B. D. Valentine). 
Total specimens examined: 37. 
