300 PROCEEDINGS OF THE NATIONAL MUSEUM Vou. 113 
scales. Tarsi black, first three segments short and broad, third segment 
slightly wider than first two; fourth segment extending well beyond 
third; claws connate near their bases, moderately divergent. Median 
lobe of male genitalia slightly broadened near apex, internal sac not 
exceeding median lobe in length. Arms of spiculum ventrale of female 
genitalia forming a V; stem distinctly expanded at its anterior end 
(fig. 82). 
Measurements: The following measurements were taken from 5 
males and 7 females from Newport, Calif. (USNM) and 3 males 
and 1 female from San Diego, Calif. (CAS). All measurements are 
in millimeters: 
Males Females 
Mean Extremes Mean Extremes 
Body length 2.33 2.20-2.60 2.56 2. 20-2. 70 
Elytra length 1.65 1.50-1.80 1.74 1. 50-1. 90 
Elytra width at base 0.88 0.79-1.00 0.93 0. 76-1. 06 
Prothorax length 0.64 0.59-0.66 0.77 0. 69-0. 83 
Prothorax width 0.66 0.59-0.73 0.76 0. 66-0. 86 
Rostrum length 0.76 0.66-0.83 0.91 0. 86-1. 06 
Rostrum length before antennal 0.30 0. 23-0.33 0. 42 0. 36-0. 46 
insertion 
Funicular segment 2 length 0. 051 0.057 0. 051-0. 068 
Funicular segment 3 length 0. 034 0.040 0. 034-0. 051 
Biotoey: The only biological information available on this species 
is this host-plant record: “On Encelia,’’ Whittier, Calif., Feb. 1, 12, 
and 22 (USNM). 
Discussion: This species resembles S. albidosquamosus Klima in 
respect to body shape and proportions and prothoracic punctation, 
but the two species may be readily distinguished by the differences 
given in the key. In addition, the median lobe of the male genitalia 
of S. obtectus has an internal crossbar behind the median orifice, and 
there is no such bar in the male genitalia of S. albtdosquamosus. 
Disrripution: S. obtectus has been recorded only from the Pacific 
mountain system in California, mainly in valley and coastal areas. 
A few specimens have been taken at higher elevations on the western 
slope of the Sierra Nevadas. The following specimens were examined: 
CALIFORNIA: LOS ANGELES CO.: Inglewood, Feb. 22, March (CM); Los Ange- 
les (USNM); Los Angeles (CM); Los Angeles, May 10 (AMNH); Mesmer City, 
Feb. 22 (CM); Redondo, March (CU); Redondo, April 2 (CM); Redondo, March, 
April (CAS); Redondo Beach, April 5 (CM); Whittier, Feb. 1, 12, 22 (USNM). 
MARIPOSA CO.: Glacier Point, 7,705 ft., May 12 (USNM); Mariposa Grove, 
6,150 ft., May 14(USNM). monoco.: Clark Station, 4,100 ft., May 9 (USNM). 
ORANGE co.: Newport, April 10 (CAS); Newport, May 12 (USNM); Silverado 
Canyon, May 5 (CAS). riversipE co.: Elsinore, April, May 3 (USNM); 
