302 PROCEEDINGS OF THE NATIONAL MUSEUM Vou. 113 
Measurements: The following measurements were taken from 10 
males and 10 females from Tucson, Ariz. (CU). All measurements 
are in millimeters: Males Females 
Mean Extremes Mean Extremes 
Body length 2. 48 2. 25-2. 60 2.48 2. 25-2. 70 
Elytra length 1. 69 1. 55-1. 80 1.70 1. 50-1. 90 
Elytra width at base 0. 88 0. 79-0. 92 0.88 0. 76-1. 00 
Prothorax length 0. 64 0. 59-0. 69 0.66 0. 59-0. 76 
Prothorax width 0. 67 0. 63-0. 69 0.70 0. 73-0. 76 
Rostrum length 0. 82 0. 79-0. 89 0.93 0. 83-1. 00 
Rostrum length before anten- 0. 34 0. 30-0. 36 0.42 0. 36-0. 46 
nal insertion 
Funicular segment 2 length 0.058 0.051-0.068 0.058 0. 051-0. 068 
Funicular segment 3 length 0.043 0.034-0.051 0.041 0. 034-0. 051 
Briotoey: A single host-plant record was taken from the material 
examined: ‘On Encilia farinosa” (correct spelling—Encelia), Catalina 
Springs, Ariz., April 8 and 14 (19 specimens, USNM). 
Discussion: The characters by which this species may be distin- 
guished from S. obtectus have been given in the discussion of the latter 
species on page 300. 
After examining two paratypes of Smicronyx mackenziei Sleeper, 
the writer has concluded that they are conspecific with S. albido- 
squamosus Klima. Both paratypes were from the type locality (Bor- 
rego, Calif.). Assuming that the paratypes are conspecific with the 
holotype, the writer has placed Smicronyx mackenziet Sleeper in 
synonymy with Smicronyz albidosquamosus Klima. 
DistripuTION: Present records indicate that S. albidosquamosus 
may be found in the basin and range portion of Arizona and in the 
Los Angeles range section and California coast portions of the Pacific 
mountain system. The following specimens were examined: 
ARIZONA: COCONINO Co.: Bright Angel, May 10 (USNM). ara co.: Globe 
(CU). vprma co.: Catalina Springs, April 2-May 5 (USNM). Sabino Canyon, 
March 20-21 (CU), Santa Catalina Mountains, Apr. 8 (CAS), Santa Catalina 
Mountains, Apr. 8 (CU), Tucson, April 11 (USNM), Tucson, April 23 (CU). 
YAVAPAI co.: Hot Springs, June 21 (USNM). 
CALIFORNIA: LOS ANGELES Co.: Los Angeles (CU), no data (USNM). MARIN 
co.: August (USNM). oRraNncE co.: Newport, April 10(CAS). RIVERSIDE Co.: 
Palm Springs, April (USNM), Palm Springs, April 26 (CAS), Palm Springs, Dec. 
22 (ELS), Elsinore, May 3 (USNM). san pirco co.: April (USNM), San 
Diego, May 21 (USNM). 
Total specimens examined: 235. 
SMICRONYX IMBRICATUS GROUP 
Description: Body elongate, only moderately stout. Rostra of 
both sexes moderately curved, slightly tapered from base to apex; 
squamose from base to near apex. Prothorax subcylindrical, but 
slightly narrowed near apex; punctures of disk rounded, not very 
