304 GEO. H. HORN, M. D. 



Our species are distinguished as follows : 

 Thorax at apex deeply emarginate, base distinctly bisinuate, margin broad 

 and deplanate. 

 Thorax arcuately narrowed from base to apex, broadest at base...geniinata. 

 Thorax with sides more arcuate at base, so that the thorax is narrower at 



base than a little in front octomaculata. 



Thorax at apex feebly emarginate, base truncate, margin narrow and not 

 deplanate. Broadest at base strigosa. 



S. geminata Say. — Oval, narrower posteriorly, piceous or rufo-piceous, 

 margins paler, elytra maculate with paler spots. Head coarsely and moder- 

 ately deeply punctured. Thorax twice as wide as long, narrower in front, 

 apex deeply emarginate, base bisinuate, sides regularly arcuate from base 

 to apex, margin broad, deplanate, hind angles rectangular, disc moderately 

 convex, coarsely and densely punctured. Elytra as wide at base as the thorax, 

 arcuately narrowed to apex, margin moderately reflexed. disc obsoletely sub- 

 costate, the costse with a single row of fine punctures each bearing a short 

 hair, the grooves between the costse closely punctured with a catenulate 

 appearance. Body beneath moderately densely punctured. Length .08 — .10 

 inch ; 2 — 2.5 mm. 



Male. — Middle and posterior tibise distinctly arcuate, the former suddenly 

 dilated in its distal half, the latter in the distal third. Sexual segment small. 



Female. — Tibise simple, not arcuate. 



Mr. Reitter has described a S. hiseriata, a type of which was pro- 

 cured through the kindness of Dr. Dohrn, of Stettin. It does not 

 differ specifically from geminata. 



Occurs in the Middle and Southern Atlantic States. 



S. octomaculata Say. — Oval, narrower posteriorly, piceous or rufo-pice- 

 ous, elytra variably maculate with paler spots. Thorax twice as wide as long, 

 narrower in front, apex deeply emarginate, base bisinuate, sides arcuate, 

 slightly coarctate at base, hind angles rectangular, margin broad, moderately 

 deplanate. Elytra as in geminata, surface not subcostate, but with the rows 

 of fine hair-bearing punctures between which are rows of large, round, shallow 

 punctures. Body beneath coarsely and densely punctured. Length .08 — .10 

 inch; 2 — 2.5 mm. 



The males have quite a distinct sexual segment. The tibise show no 

 peculiarities, but occasional males are met with in which the tooth above 

 the oblique emargination of the posterior tibise is a little more evident. 



Occurs from the New England States to Florida. 



S. Strigosa Schonherr. — Oval, narrower posteriorly, piceous, elytra in- 

 distinctly maculate. Thorax nearly twice as wide as long, narrowed in front, 

 sides arcuate, more strongly toward the front, apex feebly emarginate, base 

 truncate, hind angles rectangular, margin very narrow not deplanate, disc 

 moderately convex, punctures rather dense, coarse and substrigose. Elytra 

 not subcostate, but with the series of small hair-bearing punctures and between 

 them the usual row of coarse closely placed punctures. Body beneath densely 

 punctured. Length .06— .08 inch; 1.5 — 2 mm. 



