SMICRONYX WEEVILS—ANDERSON 203 
Key to North American Subgenera of Smicronyx ” 
1. Second and third joints of antennal funicle subequal (fig. 31); antecoxal 
ridges of prothorax usually fairly distinct (fig. 2), tarsal claws connate to 
near middle and nearly parallel (fig. 39). . . . . . Smicronyx (p. 203) 
Second joint of antennal funicle distinctly longer than third joint (figs. 32-34) ; 
antecoxal ridges of prothorax not distinct (figs. 35-37) ; tarsal claws connate 
near their bases, usually divergent (figs. 40-42)... . .2 
2. Body form very robust (fig. 4); rostrum usually strongly named (fig. 5); 
antennal club large, distinct from funicle at base (fig. 32). 
Pachyphanes (p. 262) 
Body form moderately robust at most (figs. 6, 8, 23); rostrum only moderately 
arcuate or straight; antennal club not as large and distinct (figs. 38-34) . 3 
3. Rostrum of male almost straight (fig. 9); rostrum of female much longer, 
polished, and with antennae inserted well behind the middle (figs. 10, 29) 
or, if antennae are near middle, rostrum nearly straight (fig. 10). 
Desmoris (p. 322) 
Rostra of both sexes moderately arcuate; rostrum of female not much longer 
than that of male and with antennae inserted at or only slightly behind 
middle (figs. 24,25). . ....... . . . .Pseudosmicronyx (p. 279) 
Subgenus Smicronyx Schoenherr, 1843 
Micronyx Schoenherr, Genera et species curculionidum . . ., vol. 3, p. 423, 1836 
(preoccupied by Micronyx Boisduval 1835). Type species, by original desig- 
nation: Micronyz reichi Gyllenhal, 1836. 
Smicronyx Schoenherr, Genera et species curculionidum ..., vol. 7, part 2, 
p. 313, 1843. Type species (ipso facto) Micronyx reichi Gyllenhal, 1836. 
Description: Rostrum curved, stouter and slightly shorter in 
male than in female; antennae inserted close to middle in female and 
well ahead of middle in male (figs. 12, 14-15). Second and third 
segments of antennal funicle subequal (fig. 31). Antennal club not 
suddenly distinct from funicle (fig. 31). External lobes of the man- 
dibles moderately developed (fig. 44). Prosternum emarginate at 
anterior margin and concave (fig. 2). Outer side of prosternal 
sutures raised to form antecoxal ridges (fig. 2). Humeri prominent 
and scutellum distinct (figs. 1, 11, 13, 16, 20). Tarsal claws connate 
for almost half their length (fig. 39). Median lobe of male genitalia 
short (rather elongate in S. spretus Dietz), often broadened toward 
apex (figs. 50-71). Arms of spiculum ventrale of the female genitalia 
forming a U (as in fig. 105), not a V (as in fig. 102). 
2 The key will not be completely effective unless it is used in conjunction with the descriptions of the 
subgenera and with the figures indicated. The reader should also be warned here that the S. ovipennis 
group (subg. Pseuwdosmicronyr) approaches the subgenus Pachyphanes in body form (see fig. 26), and that 
the tarsal claws of that group and of S. centralis (Dietz) (subg. Pachyphanes) resemble those of the subgenus 
Smicronyz. The apical spur of the hind tibia is usually straight in the subgenus Desmoris, and is usually 
curved upward in the subgenera Smicronyzx and Pseudosmicronyz, but it is not always as distinctly curved 
or straight as indicated in the key by Dietz (1894). 
