72 THOS. L. CASEY. 



Body strongly punctured 2 bideiitattiH. 



Body less densely punctured .".. plaiiatiis. 



Prothorax sub-quadrate; very feebly narrowed behind. 

 Sides nearly straight. 



Body densely punctured 4. imbellis. 



Body very feebly punctured 5. qnadricoIli$«. 



Sides strongly bi-sinuate, teeth very prominent fi. gila$. 



Prothorax broader than long. Small species. 



Small, but distinct tooth at anterior angles of prothorax 7. advena. 



Anterior angles of prothorax not toothed S. rectus. 



Anterior angles of prothorax indistinctly toothed, body more depressed; 

 densely and coarsely punctured 8. opaculns. 



1. S. surinamensis (Linn.) — Elongated, body dark brownish castaneous, 

 clothed with light setaceous pubescence. Prothorax with two lateral lines and 

 one median, of closer pubescence; sides evenly arcuate, and provided with six 

 teeth, separated by deep and always well-marked excavations. Antennae slightly 

 exceeding the prothorax in length. Length 2.5 mm. 



Cosmopolitan. Plate IV, Fig. 1. 



An exceedingly well-marked species; carried by commerce all over the 

 globe. 



2. S. bidentatlis (Fabr.)— Elongated, body ferruginous, very opaque, and 

 denselv punctured. Anterior angles of prothorax sharply toothed. Length 2.7 mm. 



Cosmopolitan. Plate IV, Fig. 2. 



Distinguished by length of thorax, and the well-defined teeth at the 



anterior angles of same, as also by the peculiar opacity of body. 



3. S. planatus Germ. — Body densely though rather lightly punctured, cas- 

 taneous. Elytra less densely punctured, and sparsely pubescent. Anterior half 

 of sides of prothorax parallel, then more rapidly converging. Length 2.0 — 2.7 mm. 



This species may be distinguished from the preceding by its partly 

 shining surface, that of the furmer being of perfect opacity, without a 

 trace of lustre. The prothorax is much wider, with more imperfectly 

 developed teeth, and with the sides much less sinuous. Less punctured, 

 slightly smaller, and lighter colored specimens of this species from the 

 Pacific Slope were named aS'. nitklKlKs, by Dr. LeConte, but I hardly 

 think there is a doubt as to their identity with planatus. Locality in the 

 present family seems to be of very little consequence. 



4. S. iinbellis Lee. — Elongated, body deeply and densely punctured ; pro- 

 tHorax almost exactly quadrate; surface without lustre. Prothoracic teeth very 

 slightly developed. Length 2.6 mm. 



Pa., Mo., Cal. Plate IV, Fig. 4. 

 This is a very distinct species. 



5. S. quadricollis Guer. —Elongated, body very light castaneous, integu- 

 ments very tr;insparent. Surface sparsely and lightly punctured, shining. Pro- 



