344 PROCEEDINGS OF THE NATIONAL MUSEUM Vou. 118 
the third; claws connate for less than half their length, subparallel. 
Internal sac of the male genitalia extending for more than half the 
length of the median lobe and having a rather granular appearance 
(fig. 100). Stem of spiculum ventrale of female genitalia not dilated 
at the anterior end (fig. 146). 
MeasuREMENTs: The following measurements were taken from 1 
male from Rago, Kans. (USNM),1 male from Pittsburgh, Pa. (CM), 
2 females from Colorado Springs, Colo. (USNM), 2 males and 2 females 
from Onah, Manitoba (CNC). All measurements are in millimeters: 
Males Females 
Mean Extremes Mean Extremes 
Body length 3. 20 2. 70-3. 50 3.02 2.:90=32.20 
Elytra length 2. 27 1. 90-2. 50 2.12 2. 00-2. 20 
Elytra width at base 1. 26 1. 03-1. 35 1.21 1. 15-1. 32 
Prothorax length 0. 77 0. 66-0. 89 0.72 0. 69-0. 79 
Prothorax width 0. 84 0. 76-0. 96 0.90 0. 83-0. 96 
Rostrum length 1. 26 1. 22-1. 32 1.75 1. 65-1. 82 
Rostrum length before antennal 0. 52 0. 49-0. 59 1.08 1.00-1.15 
insertion 
Funicular segment 2 length 0.097 0. 085-0.102 0.148 0. 136-0. 170 
Funicular segment 3 length 0. 068 0.076 0. 068-0. 085 
Brotocy: The only information on the biology of thisspecies consists 
of the following records of host plants: “On Helianthus flowers,” 
Clarendon, Tex., Aug. 29 (B. D. Valentine collection); “Helianthus 
tuberosa,” Blackjack, Mo., Aug. 9 and 19 (USNM). 
Discussion: This species, while sharing the general character- 
istics of the S. fulvus group, does not seem to resemble any of the other 
species in the group so closely that it cannot be distinguished from 
them by the characters given in the key on p. 333. 
The type specimens of S. rusticus Dietz and S. vitiosus Dietz, both 
of which were described from single male specimens, compare so 
closely with male specimens of S. incertus the writer is inclined to 
doubt that all the specimens in question represent more than one 
species. Therefore, the names Smicronyx rusticus Dietz and Smi- 
cronyx vitiosus Dietz have been placed in synonymy with Smicronyz 
incertus (Dietz). 
Distrinution: Records taken from the material examined indicate 
that S. incertus has a very wide distribution in the interior plains 
region and has been found in some localities (not necessarily at low 
altitudes) in the southern Rocky Mountains and in the more southern 
portion of the basin and range province. The following specimens 
were examined: 
ARIZONA: COCONINO Co.: Walnut (USNM). 
CoLorabo: EL PASO Co.: Colorado Springs, 6,000—7,000 ft. (USNM). 
KANSAS: KINGMAN Co.: Rago (USNM). 
ManirTosBa: Onah, July 22-24 (CNC). 
