Aya PROCEEDINGS OF THE NATIONAL MUSEUM Vor. 113 
and 3 females from Tucson, Ariz. (USNM). All measurements are 
in millimeters: 
Males Females 
Mean Extremes Mean Extremes 
Body length 2.03 1. 80-2. 10 2.04 1. 80-2. 40 
Elytra length 1.42 1, 25-1. 50 1.438 1. 30-1. 60 
Elytra width at base 0.71 0. 66-0. 73 0.70 0. 63-0. 83 
Prothorax length 0.50 0. 46-0. 53 0.50 0. 43-0. 59 
Prothorax width 0.55 0. 49-0. 61 0.55 0. 49-0. 63 
Rostrum length 0.67 0. 63-0. 69 0.75 0. 66-0. 83 
Rostrum length before antennal 0.25 0. 23-0. 26 0.34 0. 30-0. 40 
insertion 
Funicular segment 2 length 0.050 0. 045-0. 051 0.046 0. 042-0. 051 
Funicular segment 3 length 0.033 0. 030-0. 034 0.033 0. 025-0. 034 
Brotocy: A few host-plant records were taken from the material 
examined: “Ex Hymenoclea monogyra,’ Santa Rita Mountains, 
Ariz., April 25 (USNM); “On flowers of Hymenoclea monogyra,” 
Tucson, Ariz., May 6 (USNM); “on Hymenoclea monogyra,’”’ south of 
Marfa, Texas, Sept. 10 (USNM); “‘Chilopsis linearis,’’ 12 miles north 
of Presidio, Texas, April 26 (USNM). 
Discussion: A direct comparison of the types of Smicronyx pusio 
LeConte and Synertha uickhami Dietz revealed very little difference 
between the two specimens. Therefore, they are considered con- 
specific by this writer. A similar comparison of the type specimen of 
S. pusio and the lectotype of S. rufulus Dietz revealed no differences 
which could be taken as indications that the two specimens were not 
conspecific. 
DistRiBuTION: Present records indicate that S. pusio may be 
found in the Great Bend section of the Mexican highland, in the 
southern portion of the basin and range province, and in the Los 
Angeles range and lower California sections of the Pacific mountain 
system. The following specimens were examined: 
ARIZONA: GRAHAM Co.: Gila Valley, Aug. 1 (CAS). prima co.: Tucson, May 6 
(USNM). santa cruz co.: Patagonia, Aug. 21 (CNHM); Santa Rita Moun- 
tains, April 25 (CNC & USNM). yavapar co.: Castle Hot Springs, June 21 
(USNM). 
CALIFORNIA: RIVERSIDE co.: Riverside (USNM). 
Texas: South of Marfa, Sept. 10 (USN M), 12 miles north of Presidio, April 26 
(USNM),. 
Total specimens examined: 93. 
Subgenus Desmoris LeConte, 1876° 
Desmoris LeConte, Proc. Amer. Phil. Soc., vol. 15, p. 169, 1876. Type species, 
here designated: Rhynchaenus constrictus Say, 1823. 
Description: Rostrum straight or almost straight, not smooth 
and polished in the male; either straight or curved, much longer, 
smooth and polished (except at the base) in the female (compare 
