SMICRONYX WEEVILS—-ANDERSON 269 
Key to Species of the Srmicronyx discoideus Group 
1. Prothoracic punctures rounded, the scales of the prothorax oriented toward 
the center of the disk ...... SP ith SLOPES oy, seas opto, ek ae 
Prothoracic punctures transversely pra interspaces between punctures 
raised, forming low, wavy rugae, which run laterally from the midline; 
scales of the peiarae oriented toward the midline. 
S. centralis (Dietz) (p. 273) 
2. <A distinct posterolateral macula of dark scales present on each elytron, in 
addition to the dark dorsal macula; surface of antennal club black or 
Piceous,. "a 2 . .. . . S. discoideus (LeConte) (p. 269) 
No posterolateral maculae neeeene on the elytra; surface of antennal club 
rufous to ferruginous. . . .. . . . S. corpulentus LeConte (p. 271) 
Smicronyx discoideus (LeConte) 
Fiaures 4-5, 32, 40, 45, 73, 121 
Pachytychius discoideus LeConte, Proc. Amer. Philos. Soc., vol. 15, p. 169, 1876. 
Lectotype, here designated: Male, “N.Y.,” MCZ 1881 (J. L. LeConte 
collection). 
Pachyphanes carus Dietz, Trans. American Ent. Soc., vol. 21, p. 117, pl. 7, fig. 2, 
1894. Newsynonymy. Type: Male, ‘“‘Cal.,’”? CM (Ulke collection). 
Description: Rostra of both sexes black, moderately stout, rugu- 
lose punctate and squamose behind the antennal insertions, more 
finely punctate (the punctures elongate) before antennal insertions; 
more elongate and tapered before antennal insertions in female. 
Head black, finely alutaceous, front sparsely squamose. Antennae 
entirely black, club elongate-ovate, and thickly pubescent. Prothorax 
black, punctures of disk coarse, rounded; smooth median line present, 
slightly raised, abbreviated at both ends; scales white except for 
those of the brown maculation, which is constricted just anterior to 
its middle and nearly divided medially by white scales. Prosternum 
moderately emarginate, shallowly concave. 
Elytra black, scales, other than brown scales of the maculations, 
white; discal maculation broadest at the base of elytra and very 
irregular in shape; a distinct posterolateral maculation present on 
each elytron. Ventral surface of the thorax and abdomen closely 
covered with broadly ovate white scales. Femora clavate, black, 
covered with elongate-ovate white scales. Tibiae black, covered with 
elongate white scales; the hind pair slightly expanded at apex. Tarsi 
black, covered with white scales; first three segments rather short 
and broad; claws small, connate to near middle, slightly divergent. 
Internal sac of male genitalia shghtly constricted near its middle, 
apical portion armed with fine spines; spiculum gastrale strongly 
hooked at its anterior end (fig. 73). Stem of the spiculum ventrale 
of the female genitalia distinctly expanded at anterior end (fig. 121). 
