316 PROCEEDINGS OF THE NATIONAL MUSEUM Vou. 113 
antennal insertions; deeply punctate, slightly rugulose and sub- 
carinate before antennal insertions in male; deeply but not closely 
punctate, smooth and shining before antennal insertions in female. 
Head black, finely alutaceous; thinly squamose. Antennae black, 
their scales pale brown, second funicular joint not much longer than 
third. Prothorax black, broadly rounded at sides, narrowed but not 
constricted toward apex; punctures subconfluent, interspaces forming 
low rugae on disk; scales ovate or linear, gray at sides, but light 
brown on disk. 
Elytra black; intervals each bearing, in addition to usual row of 
setiform scales, two rows of broadly ovate scales, silvery gray at sides 
of elytra and brownish toward median suture. Underside of thorax 
and abdomen black, covered with broadly ovate, pale gray scales. 
Femora moderately clavate, rufopiceous, thinly covered with ellip- 
tical and elongate pale gray scales. Tibiae rufopiceous, thinly 
covered with elongate, brownish gray scales. ‘Tarsi piceous, third 
segment much broader than first two; fourth segment extending only 
slightly beyond third; claws connate near their bases, slightly di- 
vergent. Median lobe of male genitalia slightly broadened at apex; 
internal sac not exceeding median lobe in length, covered with fine 
spines (fig. 89). Stem of spiculum ventrale of female genitalia 
expanded at anterior end (fig. 135). 
MerasurEMEnts: The following measurements were taken from 1 
male from Lucas Co., Ohio (USNM), 1 male and 1 female from Gien 
Echo, Md. (USNM), 3 males and 2 females from Lucedale, Miss. (CU), 
1 male from Norfolk, Va. (USNM), 1 male from Lake Toxaway, N.C. 
(AMNH), and 1 female from Wall, Pa. (CM). All measurements 
are in miljimeters: 
Males Females 
Mean Extremes Mean Extremes 
Body length 2. 41 1. 80-2. 80 2.32 2. 00-2. 60 
Elytra length 1. 68 1. 30-1. 90 1.52 1.30-1. 80 
Elytra width at base 0. 89 0. 63-1. 09 0.90 0. 73-1. 06 
Prothorax length 0. 62 0. 46-0. 73 0.64 0. 56-0. 69 
Prothorax width 0. 68 0. 49-0. 76 0.67 0. 59-0. 73 
Rostrum length 0. 88 0. 66-1. 00 0.95 0. 89-1. 00 
Rostrum length before antennal 0. 33 0. 26-0. 40 0.48 0. 46-0. 49 
insertion 
Funicular segment 2 length 0.056 0.051-0.068 0.055 0. 051-0. 068 
Funicular segment 3 length 0.039 0.034-0.051 0.038 0. 034-0. 051 
Briotocy: Hamilton (1886) reported that he had collected S. griseus 
on Ambrosia artemisiifolia during August and September. From his 
description of the specimens, it seems probable that he did have S. 
griseus LeConte. The locality where the observations were made was 
not given, but Hamilton could have made them near his home at 
Allegheny, Pa. 
