432 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



Length to tip of venter 5-6 millimeters ; to tip of membrane 6-7^ 

 millimeters. Width of base of pronotum 2.^-3 millimeters. 



First obtained in Cuba ; afterward in Sonora, Mexico 5 since then on 

 the sea-coasts of Massachusetts, North Carolina, and Georgia. I have 

 met with it in large numbers on the sea-coast of Worcester County, in 

 Maryland, in July and August. It lives on the pale sands not remote 

 from the beach, and the darker varieties may be met with running briskly 

 over the gray or blackish sandy mud, neglecting the dry spots, but 

 often swarming upon the moist places. 



The genital segment of the male has a long, curved, acutely tapering 

 appendage, and two shorter and straighter approximate ones in the 

 middle, superiorly. 



2. S. ligata. 



Acanthia ligata Say, Heteropt. New Harmony, 34, No. 1. 

 Form the same as in the preceding, black, a little shining. Head a 

 little narrower, black, with a yellow arc on the arched base; the margins 

 of the orbits of the eyes, the cheeks, tylus, and collum of the throat 

 more or less yellow; vertex with two impressed oblique lines converging 

 before the ocelli, a short, longitudinal one outside of each ocellus, and a 

 short, wide groove on the middle of the raised front ; the front generally 

 bounded beneath by a transverse yellow band. Eostrum reaching upon 

 the intermediate coxse, slender, piceous, the basal joint yellow, with its 

 apex black. Antennae piceous or black, the basal joint paler above, 

 short and thick; the apical joint a little shorter than the third, but very 

 much longer than the basal one. Pronotum transverse, moderately flat, 

 with the anterior lobe, omitting the outer margin, very prominently con- 

 vex, indented, and bounded by an impressed line; surface black, shining, 

 exceedingly minutely punctate, very finely pubescent; the lateral mar- 

 gins white, abruptly recurved along their whole length, and a little con- 

 cave ; posterior margin deeply, concavely sinuated, with a yellow spot 

 each side, and a smaller one in the protracted, obliquely truncated 

 angles ; the extreme outer angle with a short tubercular ridge. Ante- 

 pectus black, broadly margined all around with whitish, minutely punc- 

 tate and finely pubescent; remaining pectoral divisions dull black, finely 

 pubescent; margin behind and outside with white, and with extero-pos- 

 terior lobes also white. Coxse black, terminated and margined with 

 white ; femora lineated, with black on the inside and outside, either 

 throughout or in j)art; the knees and lines upon the tibiae and their ends, 

 the basal joint of tarsi, and the ends of the second and third joints also 

 black; nails pale piceous. Scutellum black, very minutely punctate, 

 finely pubescent ; a short, linear, yellow spot on the margin, at the outer 

 end of the transverse impression, and the acute tip with a more or less 

 slender spot each side. Corium black, finely, closely punctate and 

 pubescent; the costal margin, alongish double spot on the suture a little 

 behind the base, a similar but larger spot on the middle, a third, either 

 double or triple, near the apex, two or three smaller ones near and on 



