SMICRONYX WEEVILS—ANDERSON 245 
others elliptical, sparse toward center of disk except along midline; 
prosternum shallowly emarginate, slightly concave. 
Elytra black; intervals thinly covered with pale gray or yellowish 
gray, elliptical scales. Underside of thorax and abdomen black, thinly 
covered with a mixture of ovate and narrow pale gray scales. Femora 
moderately clavate; piceous, covered with narrow, yellowish gray 
scales. Tibiae stout, piceous; covered with small, elliptical gray 
scales. ‘Tarsi piceous; third segment distinctly broader than first two; 
fourth segment extending well beyond third; claws nearly parallel, 
connate for approximately half their length. Sides of median lobe of 
male genitalia subparallel; internal sac armed with small spines (fig. 
66). 
MeasurEeMEnts: The following measurements were taken from the 
lectotype (a male), 1 male from Pinal Creek, Globe, Ariz. (CU), 1 male 
from Sacaton, Ariz. (USNM), 3 males and 1 female from Portal, Ariz. 
(Howden). All measurements are in millimeters: 
Males Female 
Mean Extremes - 
Body length 1. 44 1. 35-1. 60 1 7a) 
Elytra length 0. 96 0. 83-1. 10 1. 09 
Elytra width at base 0. 53 0. 49-0. 63 0. 66 
Prothorax length 0. 39 0. 36-0. 43 0. 36 
Prothorax width 0. 43 0. 40-0. 50 0. 46 
Rostrum length 0. 51 0. 46-0. 59 0. 59 
Rostrum length before antennal 0. 17 0. 13-0. 20 0. 23 
insertion 
Funicular segment 2 length 0. 034 0. 034 
Funicular segment 3 length 0. 034 0. 034 
Brotoey: Two host-plant records are presently available for this 
species: ‘‘Mesquite,”’ Portal, Ariz., June 16 (Howden); ‘‘Sweeping 
clover,” Portal, Ariz., June 17, 22 (Howden.) 
Discussion: The few specimens of this species which were examined 
were not difficult to distinguish from the other species of the S. in- 
stabilis group on the basis of their small size, all gray scales. S. 
silaceus is near S. pusillus in size, but differs from the latter in having 
a combination of yellow, white, and yellowish brown scales which 
are closely spaced on the elytra and which form a distinct white median 
vitta on the midline of the prothorax. 
Disrrrution: The few available records indicate that S. pusillus 
may be found in the southern portion of the basin and range province 
in Arizona and in the southern portion of the Pacific mountain system 
in California. The following specimens were examined: 
ARIZONA: COCHISE Co.: Portal, June 16, 17, 22 (Howden). rua co.: Pinal 
Creek, 4,000 ft., at Globe, June 7 (CU). prnatco: Sacaton (USNM). 
Total specimens examined: 6. 
