SMICRONYX WEEVILS—ANDERSON 259 
genitalia covered with fine spines (fig. 70). Spiculum ventrale of 
female genitalia distinctly expanded at the anterior end (fig. 118). 
MeasurEMENTs: The following measurements were taken from 3 
males and 5 females from Tombstone, Arizona (CNHM), 2 males 
from Benson, Arizona (CAS), and 1 female from “Arizona”? (AMNH),. 
All measurements are in millimeters: 
Males Females 
Mean Extremes Mean Extremes 
Body length 3. 62 3. 50-3. 80 3. 85 3. 70-4. 00 
Elytra length 2. 60 2. 50-2. 70 2.73 2. 60-2. 90 
Elytra width at base 1. 55 1. 53-1. 60 1. 67 1. 63-1. 80 
Prothorax length 0. 89 0. 80-0. 93 0. 95 0. 93-1. 00 
Prothorax width 1. 09 1. 00-1. 26 110 1. 00-1. 20 
Rostrum length 123 1. 16-1. 33 1. 50 1. 43-1. 53 
Rostrum length before 0. 48 0. 43-0. 56 0. 77 0. 70-0. 80 
antennal insertion 
Funicular segment 2 length 0.085 0.068-0.102 0.093 0. 085-0. 102 
Funicular segment 3 length 0.071 £0. 068-0.085 0.079 0. 068-0. 085 
Brotocy: The only information available on the biology of this 
species consists of the following few host-plant records: ‘On 
Gutierrezia,’’ 2 miles west of Penwell, Texas (USNM); ‘on Viguiera 
stenoloba foliage,” Presidio, Texas, Aug. 17 (USNM); “on foliage of 
Condalia lycioides,’”’ near Presidio, Texas, June 4 (USNM). 
DistrispuTion: Present records indicate that the range of S. 
profusus extends from the southwestern portion of the Great Plains 
westward across the southern portion of the Rocky Mountain system 
and southward into the Mexican highlands. The only Mexican rec- 
ord was published by Kissinger (1955), who collected a few specimens 
of S. profusus about 50 miles north of Saltillo, Mexico. The following 
specimens were examined: 
ARIZONA: COCHISE Co.: Benson (CU and CAS); Huachuca Mountains, (USNM); 
Tombstone, Sept. 14 (CM and CNHM). No data (AMNH). 
TEXAS: ECTOR CO.: 2 miles west of Penwell, July 10 (USNM). JEFF Davis Co.: 
Valentine, June 3 (USNM). presipro co.: Near Presidio, June 4 (USN M); Presidio, 
Aug. 17 (USNM). 
Total specimens examined: 22. 
SMICRONYX SPRETUS GROUP 
Description: Body elongate-oval, moderately stout, (fig. 16). 
Rostrum fairly stout, moderately curved in both sexes (figs. 17, 18); 
more elongate and smooth before antennal insertions in female, 
Prothorax moderately rounded on sides, narrowed and slightly con- 
stricted toward apex (fig. 16). Elytra widest behind middle, declivities 
distinct (fig. 16). Median lobe of male genitalia heavily sclerotized 
dorsally, broader at apex than at base; orificial plates fused dorsally 
and expanded at that point into a peculiar platelike structure; 
