260 PROCEEDINGS OF THE NATIONAL MUSEUM Vou. 113 
a very dark, roughly Y-shaped patch of spines present on 
internal sac near orificial plates (fig. 71). Stem of spiculum ventrale 
of female genitalia slightly expanded at anterior end (fig. 119). 
Discussion: S. spretus bears a strong resemblance to the species 
of the S. cinereus group in respect to size, general body“shape and 
proportions, and prothoracic punctation. However, the male genitalia 
of S. spretus are radically different from the male genitalia of any of the 
species in the S. cinereus group (see figs. 50-52). The peculiar plate- 
like modification of the orificial plates, mentioned in the description 
above, does not exist in the S. cinereus group, and the median lobe is 
never heavily sclerotized above (as in S. spretus) in that group. 
Map 6 gives the distribution of this group. 
Smicronyx spretus Dietz 
Ficures 16-18, 71, 119 
Smicronyz spretus Dietz, Trans. Amer. Ent. Soc., vol. 21, pp. 145, 146, pl. 8, 
fig. 14, 1894. Lectotype, here designated: Male, ‘ Ariz.,’’? MCZ 1902 (Dietz 
collection). 
Description: Rostrum of both sexes moderately curved, piceous, 
closely squamose, scales yellowish brown behind antennal insertion; 
closely punctate and carinate for almost entire length in the male; 
rugosely and deeply punctate but not carinate before antennal inser- 
tions of the female. Head black, finely alutaceous, densely squamose 
in front. Antennae piceous, scales narrow, yellowish white. Pro- 
thorax black, shape as in group description, disk evenly covered with 
deep rounded punctures, interspaces finely alutaceous; scales both 
Map 6.—Distribution of the specimens ex- 
amined of the spretus group of Smicro- 
nyx. @, S. spretus. 
