SMICRONYX WEEVILS—ANDERSON 291 
median orifice (fig. 78). Stem of spiculum ventrale of female geni- 
talia markedly expanded at anterior end (fig. 128). 
MeasurEMENTs: The following measurements were taken from 15 
males and 15 females, which were collected at several localities, 
including Easton, Pa. (CAS), Wyoming, Pa. (USNM), Phillipsburg, 
N.J. (CAS), Oakwood, N.Y. (USNM), Fort Sheridan, Ill. (CNHM), 
Louisville, Ky. (USNM), Beltsville, Md. (USNM), Leamington, 
Ont. (CNC), and Lincoln, Nebr. (USNM). All measurements are 
in millimeters: 
Males Females 
Mean 8 Extremes Mean 8 Extremes 
Body length 3.00 0.133 2. 70-3. 20 3.06. 0.108 2, 85-3. 25 
Elytra length 2.04 0.104 1. 80-2. 20 2.06 0.051 #2. 00-2. 20 
Elytra width at 1.30. 0.042 1. 20-1. 40 1.31 0.028. 1..20—-1. 40 
base 
Prothorax length 0.81 0.043 0. 70-0. 90 0.84 0.047 #0. 80-0. 90 
Prothorax width 0.93 0.041 0. 85-1. 00 0.97 0.041 0. 90-1. 00 
Rostrum length 1.16 0.074 1. 10-1. 30 1,50). ; 0: 182. 1. 20-1.,.45 
Rostrum length 0.40 0.030 0. 35-0. 45 0.64 0.039 0. 55-0. 70 
before an- 
tennal in- 
sertion 
Funicular seg- 0. 104 0. 102-0.119 0.119 0. 102-0. 153 
ment 2 length 
Funicular seg- 0. 067 0. 051-0. 068 0. 069 0. 068-0. 085 
ment 3 length 
Brotocy: The host records which follow were taken from the mate- 
rial examined: “On Ambrosia trifida floral parts,’ Oakwood, N.Y., 
Sept. 7 (USNM); “On OQenethera biennis flower buds,” Bronx Co., 
N.Y., Aug. 14 (USNM); ‘on cotton,’ Dennison, Texas, June 22 
(USNM); ‘‘coll. on cotton,’ Waco, Texas, July 22 (USNM); “reared 
from fruit and flower of giant ragweed,” Kinderhook, Illinois, Aug. 
25, Sept. 4 (USNM); “Ambrosia-sp.,”’ Westerville, Ohio, July 31 
(ELS). 
Discussion: A direct comparison of the lectotype specimens of the 
species listed in synonymy and the type specimen of S. flavicans 
LeConte did not reveal any differences which could not be either indi- 
vidual or regional variation. The yellow scales of the type of S. 
flavicans are brighter yellow than those of S. nebulosus and S. macu- 
latus, but the color pattern, body shape and proportions, and pro- 
thoracic sculpturing are very similar in all three specimens. 
A discussion of the differences between S. flavicans and S. immacu- 
latus, new species, is given in the discussion of the latter, on page 294. 
Distrisution: According to present records, the range of S. flavi- 
cans extends from the Atlantic coastal plain in Maryland across the 
Appalachian highlands and into the central lowlands, where it may be 
found from Iowa to Texas. The following specimens were examined 
