328 PROCEEDINGS OF THE NATIONAL MUSEUM Vou. 113 
Smicronyx constrictus (Say) 
FIGURES 28, 29, 34, 94, 140; PLaTE 1 
Rhynchaenus constrictus Say, Journ. Acad. Nat. Sci. Philadelphia, vol. 3, p. 313, 
1824. Neotype, here designated: Female, ‘‘ Missuri,’’ collected by Thomas 
Say, Naturhistoriska Riksmuseet, Stockholm. 
Desmoris pervisus Dietz, Trans. Amer. Ent. Soc., vol. 21, p. 125, 1894. New 
synonymy. Lectotype, here designated: Female, ‘‘ Dakota,’ MCZ 1887 
(Dietz collection). 
Description: Rostra of both sexes black to piceous; stout, slightly 
curved, punctate from base to apex, more coarsely punctate and 
squamose behind the antennal insertions in the male; slender, moder- 
ately curved, finely punctate and polished before the antennal inser- 
tions in the female. Head piceous, finely alutaceous, sparsely 
squamose in front. Antennae piceous, the first funicular segment 
slightly longer than the second. Prothorax black, rufopiceous near 
the apex; sides broadly rounded, moderately narrowed and constrict- 
ed behind the apex; disk covered with closely spaced rounded 
punctures, a trace of a smooth median line present toward the apex; 
scales ovate to elongate-ovate, very light gray to white, very sparse 
toward the midline, but quite close on the sides. 
Elytra black to piceous, the intervals coverd with small elliptical 
to ovate scales which are usually white, but may be light gray or very 
light yellow. Underside of the thorax and abdomen covered with 
small ovate white scales. Tibiae piceous, covered with small ovate 
white scales. Tarsi black, covered with small white scales; fourth 
segment extending well beyond the third; claws connate near the base, 
moderately divergent. Internal sac of the male genitalia constricted 
near the middle, the spines very small; spiculum gastrale not hooked 
at the anterior end (fig. 94). Spiculum ventrale of the female geni- 
talia not expanded at the anterior end (fig. 140). 
Measurements: The following measurements were taken from a 
male and a female from Kansas (CAS), a female from “Kans.” 
(USNM), 2 males and 2 females from Cross Keys, Mo. (USNM), 
2 females from Blackjack, Mo. (USNM), and a female from Kan- 
kakee, Ill. (CNHM). All measurements are in millimeters: 
Males Females 
Mean Extremes Mean Extremes 
Body length 3. 20 2. 90-3. 30 3.54 2. 85-3. 90 
20 2. 00-2. 30 2.38 1. 90-2. 60 
31 1: 19-1. 38 1:40) 215-1549 
84 0. 79-0. 92 0.94 0. 79-1. 00 
96 0. 89-1. 00 1.08 0. 86-1. 15 
26 1S15—15,.32 1.97 1. 65-2. 08 
48 0. 46-0. 49 1.21 -0-96—1. 38 
Elytra length 
Elytra width at base 
Prothorax length 
Prothorax width 
Rostrum length 
Rostrum length before 
antennal insertion 
Funicular segment 2 length 
Funicular segment 3 length 
SroocrN 
107. 0. 102-0.119 0.138 0. 102-0, 153 
. 062 0.051-0.068 0.070 0. 051-0. 085 
o° 
