270 GEO. H. HORN, M. D. 



7. — Genpe very coarsely punctate eloiigata. 



Gense smooth 8. 



8. — Surface shining, the punctuation never very coarse ; posterior tibiae indis- 

 tinctly grooved near apex ta'iiiata. 



Surface subopaque, the punctuation coarse, close and deep...niargiiiHli;i. 



S. hlldsoiiias Forst. — Form elongate, subdepressed, piceous black, shining. 

 Antenna^ slender, as long as half the body, two basal joints piceous, 3-4-5 testa- 

 ceous, the outer joints gradually darker. Head indistinctly alutaceous, sparsely 

 punctate. Thorax about one-third wider than long, scarcely narrowed in front, 

 sides feebly arcuate, margin narrowly reflexed, front angles obliquely truncate, 

 disc moderately convex, slightly alutaceous, indistinctly punctate, somewhat 

 scabrous. Elytra wider at base than the thorax, humeri obtuse, disc rather 

 coarsely and closely punctate, surface shining. Body beneath more shining and 

 smooth than above, abdomen very sparsely punctate. Legs black. Length .18 

 inch. ; 4.5 mm. 



The male has the last ventral .segment notched each side, the mid- 

 dle lobe triangularly impressed with a deeply impressed short median 

 line. 



This species is so common and well known as to need no further 

 comment. It is the only one in our fauna totally black. 



Occurs over the entire region east of the Rocky Mountains. 



S. frontalis Fab. — Similar in form to hmlsonias, but a little broader, pice- 

 ous black, less shining, head rufotestaceous. Antennae as in hiuhoniaa. Head 

 sparsely, indistinctly punctate. Thorax one third wider thijn long, slightly nar- 

 I'owed in front, sides slightly arcuate, margin narrowly reflexed, anterior angles 

 obliquely truncate, disc moderately convex, alutaceous, coarsely not closely 

 punctate. Elytra wider at base than the thorax, humeri rounded, surface closely 

 and moderately coarsely punctate. Body beneath more shining than above, 

 abdomen very sparsely punctate. Legs piceous. Length .14 — .20 inch. ; 3.5 — 

 5 mm. 



The male sexual characters are very like those of hudsoiiias. 



While closely related to hadsonias, it is, apart from the color of 

 the head, distinguished by its rather broader form ; elytral punctua- 

 tion less coarse, but rather more dense. 



Occurs with hudsonias. As a rule the specimens from the Canadian 

 region are smaller than those from the South(!i-n States. 



S. collaris Crotch. --Oblong, rather parallel, subdei)ressed, piceous, moder- 

 ately shining, thorax yellowish red. Antennie half as long as the body, piceous, 

 joints 3 and 4 and the underside of first and second pale. Head piceous. front 

 yellow, a few scattered, rather fine punctures on the sides of vertex. Thorax 

 one half wider than long, very little wider at base than apex, widest one-third 

 from the front angles, sides moderately arcuate, margin narrowly reflexed, front 

 angles obtuse, disc moderately convex, smooth, with a few scattered fine punc- 

 tures. Elytra wider at base than the thorax, humeri obtuse, disc finely and not 



