250 PROCEEDINGS OF THE NATIONAL MUSEUM VoL. 113 
elongate whitish scales. Tibiae near femora in color, covered with a 
mixture of ovate-elliptic and narrow scales. Tarsi piceous, fourth 
segment extending noticeably beyond third segment but not markedly 
elongate. Claws connate for slightly less than one-half their length, 
slightly divergent. Median lobe of male genitalia short; subparallel 
at sides; internal sac covered with small spines, which are more con- 
densed on the dorsum, and form two convergent longitudinal lines; 
spiculum gastrale rather sinuate, lateral lobe of anterior end rather 
straight (fig. 67). 
Measurements: The following measurements were taken from 10 
males and 10 females collected at Brownsville, Texas (USNM). All 
measurements are in millimeters: 
Males Females 
Mean 8 Extremes Mean 8 Extremes 
Body length 1.80 0.084 1.68-1.91 1.85 0.148 1.59-1.95 
Elytra length 1.24 0.070 1.12-1.32 1.26 0.094 1. 06-1. 35 
Elytra width at base 0.75 0.059 0.66-0.80 0.76 0.067 0. 66-0. 83 
Prothorax length 0.48 0.057 0. 43-0.49 0.50 0.044 0. 438-0. 56 
Prothorax width 0.56 0.022 0.53-0.59 0.59 0.047 0. 49-0. 63 
Rostrum length 0.69 0.041 0.66-0.79 0.79 0.055 0. 69-0. 83 
Rostrum length before 0.21 0.029 0.16-0.26 0.30 0.012 0. 23-0. 33 
antennal insertion 
Funicular segment 2 0. 038 0. 03-0.05 0. 048 0. 03-0. 05 
length 
Funicular segment 3 0. 030 0. 041 0. 03-0. 05 
length 
Brotocy: The only biological information available on this species 
consists of the following host-plant records: ‘Ex pods of Abutilon” 
Brownsville, Tex., March 7 (USNM); “‘Parthenium,” March 30, 31, 
Brownsville, Tex. (USNM); “In copulation on Parthenium hystero- 
phorus,” Brownsville, Tex., Sept. 16 (USNM); ‘on Ambrosia texana,” 
Brownsville, Tex., June 10 (DMA); ‘“Monarda,” Brownsville, Tex., 
March 23 (USNM); ‘‘Monarda citriodora,” Brownsville, Tex., March 
24 and 31 (USNM); “cotton,” Brownsville, Tex., Apr. 15 (USNM). 
Discussion: S. lutulentus bears a stronger resemblance to S. 
albonotatus new species than to any other species in the S. quadrifer 
group. A discussion of the qualitative and the quantitative differ- 
ences between the two species is given on p. 252. 
Distrinution: Present records indicate that S. lutulentus may be 
found on the Gulf coastal plain in Texas and in the southern portion 
of the Great Plains in Texas. The following specimens were ex- 
amined: 
TEXAS: BEXAR Co.: San Antonio, April 22, May 10 (USNM). CAMERON Co.: 
Brownsville (Esperenza Ranch) (USNM); Brownsville (Los Borregos), May 22 
and 24, June 6 (USNM); Brownsville, March 7-31, April 15, 21, 28, 30, May 2, 
June 7, 9, 16, Sept. 16 (USNM); San Benito, March 20 (USNM). UVALDE Co.: 
