SMICRONYX WEEVILS—ANDERSON 267 
with elongate-elliptic white scales. Tibiae stout, deep reddish brown, 
thinly covered with rows of linear white scales; hind pair distinctly 
broadened toward apex. ‘Tarsi black to piceous, covered with elon- 
gate white scales; third segment deeply bilobed, much broader than 
first two segments; fourth segment extending beyond the third by 
approximately the length of the latter; claws connate for about two- 
fifths of their length, slightly divergent. 
Measurements: The following measurements were taken from 10 
males and 8 females from Draper, Utah, August 25 (B. D. Valentine). 
All measurements are in millimeters: 
Males Females 
Mean Extremes Mean Extremes 
Body length 2. 54 2. 00-2. 80 2.85 2.70-3. 00 
Elytra length 1. 57 1. 30-1. 90 1.82 1. 70-1. 95 
Elytra width at base 1. 06 0. 92-1. 15 1.16 1. 09-1. 22 
Prothorax length 0. 72 0. 56-0. 79 0.82 0. 76-0. 89 
Prothorax width 0. 88 0. 70-1. 00 1,00 0. 96-1:.06 
Rostrum length 1. 06 0. 838-1. 15 1.22 1.15-1. 25 
Rostrum length before antennal 0. 32 0. 26-0. 41 0.48 0. 43-0. 53 
insertion 
Funicular segment 2 length 0.092 0.068-0.102 0.096 0. 085-0. 102 
Funicular segment 5 length 0.060 0.051-0.068 0.064 0. 051-0. 068 
Hotoryre: Male, USNM 65402. 
Typr Locauity: Draper, Salt Lake Co., Utah. Collected by B. D. 
Valentine on August 25, 1953. 
ParatyPEs: 20 males and 17 females taken with the holotype and 
deposited as follows: 14 males, 12 females in B. D. Valentine collection; 
6 males, 5 females in USNM collection. 
Brotocy: The type series was labeled “sweeping roadside weeds, 
especially Ambrosia.” No further information on the biology of this 
species is presently available. 
Discussion: This species closely resembles S. amoenus (Say), and 
may eventually be interpreted as an isolated population or subspecies 
of S. amoenus when the distributions of the two are better known. 
However, there are a number of differences between the presently 
available specimens of S. amoenus and S. converus. S. converus is, 
on the average, a larger species than S. amoenus (see tabulations on 
pages 265 and 267), has a darker body color than S. amoenus, has a low 
median carina on the rostrum, and a large number of white scales 
(which give the species a whitish appearance), which is not true of 
S. amoenus. In addition, the shape of the median lobe of the male 
genitalia differs between the two species (see figs. 72, 154), the stem of 
the spiculum ventrale (eighth sternum) of the female is much more 
