74 THOS. L. CASEY. 



8. S rectus Lee. — Color same as preceding: prothorax quadrate, broader 

 than Ions;; sides nearly straight; anterior angles not toothed. Surface rather 

 deeply punctured, and covered with long setaceous pubescence. Length 2.0 mm. 



Pa., S. C, Fla., Ariz. Plate IV^ Fig. 7. 



Resembles advena somewhat in general appearance ; it is, however, 

 less convex. 



9. S. opaculns Lee. — Light ferruginous, body depressed, densely and 

 coarsely punctured; setiform, very opaque; opacity resembling that of bidenta- 

 tus; prothorax quadrate; length and breadth equal; sides nearly straight, and 

 teeth not developed. Length l.S mm. 



Cal. Plate IV, Fig. 8. 



A very distinct species; it does not appear to be very common. 



NAUSIBIUS Redt. 

 This genus may be distinguished from the preceding by the antennae, 

 which enlarge gradually to a club. The body is elongate, very depressed, 

 broader, as a rule, than in SiJvanuft. 



Mentum deeply emarginate; ligula broadly, but not deeply emarginate, and 

 slightly enlarged anteriorly. Elytra covering the entire abdomen, punctato-striate 

 arid costate. First joint of tarsi much longer than second, fourth very much 

 smaller; under surface ciliated: inner lobe of maxillae terminated by a well- 

 marked bifid hook. 



Two species are known in our fauna, which may be distinguished as 

 follows : 



Antennae placed on anterior angles of liead : first joint entirely visible. 



1. dentatus. 

 Antennae placed under anterior angles of head; first joint almost entirely con- 

 cealed from above 2. repaiidtis. 



1. Bf. dentatllS (Marsh). — Deep blackish brown; body deeply and densely 

 punctured; integuments opaque. Antennae placed on anterior angles of head in 

 front of eyes; robust and rather short; prothorax quadrate; sides undulated, teeth 

 six. Eyes placed at posterior angles of head ; moderate, coarsely granulated. 

 Length 3. .5 — 5.0 mm. 



Cosmopolitan. Plate IV, Fig. 9. 



Distributed by commerce over the entire globe. 



2. IV. repandllS Lee — Same color as preceding; body less strongly punc- 

 tured; somewhat shining, opaque, smaller and proportionally narrower ; protho- 

 rax slightly narrowed behind; longer than broad; sides straight, and slightly 

 serrulate. Antennae placed slightly under anterior angles of head. Eyes small, 

 coarsely granulated, and placed on posterior angles of head. Length 2.8 — 3.2 mm. 



D. C, Fla. Plate IV, Fig. 10. 



Appears to be quite rare in collections. In a series which I have had 

 un opportunity for examining in the cabinet of Mr. Ulke. the prothorax. 



