434 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



and less vertical than in S. sphacelata, the front less prominently con- 

 vex, and the sutures not so distinct ; vertex either dusky, or with a 

 small, black spot on the middle, and with a narrow black base ; its sur- 

 face very flat and the eyes very large and prominent; the base of the 

 head forming a distinct neck, which is broader than the diameter in 

 front of the eyes. The tylus pubescent, but the cheeks and gula bald and 

 whitish. Antennae long, dusky, beset with long, dark hairs; the two first 

 joints clay-yellow; the basal one stout, short, a little thicker toward the 

 tip, second longest, feebly thickened on the extreme tip; third and 

 fourth scarcely thinner than the second, the fourth a little shorter 

 than the third, but not much longer than the basal joint. Ros- 

 trum reaching near to the middle of the posterior coxse, pale at base, 

 piceous at tip. Pronotum polished, transverse, clothed with long, erect, 

 dusky pile, remotely punctate; the lateral margins oblique, with the 

 edge broad, thin, recurved ; the anterior angles blunt, but almost rectan- 

 gular ; the collum slender but distinct, blackish ; anterior lobe high, very 

 convex, dusky in front, and bordered by a deeply impressed, i)iceous line, 

 having a few coarse punctures across the middle, and remote finer punct- 

 ures in the impressed lines ; x)leur0e pale, finely sericeous pubescent ; 

 sternum paler, bald, darker posteriorly; the impressed arc in front of 

 the anterior coxse piceous. Ooxse pale yellow ; legs dark luteous, with 

 dusky hairs ; thighs somewhat pointed with brown ; the tibiae with a 

 piceous tip and spines, and the tips of thetarsal joints piceous, the nails 

 paler piceous. Scutellum a little convex at base, polished, pubescent, 

 a little punctate on the base and middle, which are also more or less 

 infuscated. Corium broad, pale luteous, closely, obsoletely punctate, 

 erect, pubescent ; the base of costal margin expanded and broadly 

 rounded, the costal area very wide, the sutures and outer margin brown- 

 ish ; membrane paler, the nervures long and rather straight, piceous, 

 bounding five large areoles. Venter highly polished, clothed with long, 

 pale pubescence, minutely and obsoletely punctate. The membrane is 

 not conspicuously distinguished at first sight from the corium, and the 

 latter when held up to a strong light appears flecked and dotted with 

 brown. The disk of the venter is occasionally a little infuscated. Male 

 genital appendages apparently like those of the preceding species. Oc- 

 casionally there is a series of brown dots on the venter near the connexi- 

 vum. 



Length to tip of venter 4-5 millimeters. Length to tip of membrane 

 5J-6J millimeters. Width of base of pronotum 1^2 millimeters. 



Very abundant near the sea-coast of Eastern Massachusetts. Near 

 Chelsea, July 9 ; and near Charles Eiver, in the vicinity of Newtonville. 



The posterior angles of the pronotum are obliquely protracted, flat- 

 tened, obliquely truncated, and with a slight convexity next the outer 

 angle. 



5. S. spliacelata, new sp. 



Elliptical, dusky, testaceous, dull, clothed above with minute, close, 



