224. PROCEEDINGS OF THE NATIONAL MUSEUM Vou. 113 
Smicronyx atratus Dietz 
Fiaures 55, 107 
Smicronyx atratus Dietz, Trans. American Ent. Soc., vol. 21, pp. 153-154, 1894. 
Lectotype, here designated: Male, ‘‘Tex.,’’ Academy of Natural Sciences, 
Philadelphia 2918 (Horn collection). 
Description: Rostra of both sexes black, stout, strongly curved; 
roughly punctate, slightly gibbous, sparsely scaly behind antennal 
insertions; rugose punctate before antennal insertions; only slightly 
longer and more tapered before antennal insertions in female than in 
male. Head black, finely alutaceous, sparsely squamose in front. 
Antennae black to piceous, scales yellowish white. Prothorax black, 
strongly rounded at sides, strongly narrowed and constricted just be- 
hind apex, quite convex dorsally; the disk covered with rounded punc- 
tures, interspaces finely alutaceous; scales either medium yellowish 
brown or white, white scales condensed into three short vittae near 
base; prosternum moderately emarginate, short before coxae. 
Elytra piceous, the intervals covered with ovate brown and white 
scales, the white condensed into short vittae at base of third interval 
and on the humeri as well as into broken bands on rest of elytra. 
Underside of the thorax and abdomen thinly covered with broadly 
ovate yellowish brown scales. Femora moderately clavate, rufopi- 
ceous, covered with ovate brownish yellow scales. Tibiae rufopi- 
ceous, covered with rows of small, elliptical yellowish scales. Tarsi 
black, covered with light brownish yellow scales, first three segments 
short and broad. Stem of spiculum ventrale of female genitalia 
distinctly expanded at anterior end. 
Measurements: The following measurements were taken from 2 
males and 1 female from Brownsville, Tex. (USNM), 1 male and 7 
females from Sedalia, Colo. (USNM), 1 male from Anahuac, Tex. 
(USNM), and 1 male from Sabinal, Tex. (USNM). All measure- 
ments are in millimeters: 
Males Females 
Mean Extremes Mean Extremes 
Body length 2. 48 2. 10-2. 70 2.79 2. 60-2. 90 
Elytra length 1. 74 1. 40-1. 90 2.00 = 1. 80-2. 10 
Elytra width at base 0. 92 0. 73-1. 03 1.12 1.00-1.15 
Prothorax length 0. 60 0. 49-0. 63 0.68 0. 66-0. 73 
Prothorax width 0. 74 0. 59-0. 79 0.83 0. 76-0. 86 
Rostrum length 0. 89 0. 73-1. 03 1.04 0. 92-1. 06 
Rostrum length before antennal 0. 32 0. 26-0. 36 0.41 0. 83-0. 46 
insertion 
Funicular segment 2 length 0.064 0.051-0.068 0.068 
Funicular segment 3 length 0.048 0.034-0.051 0.051 
