110 GEO. H. HORN, M. D. 



thorax at base, form regularly oval, moderately convex, subsutural oosta very 

 feeble, surface moderately densely punctate and very sparsely pubescent. 

 Body beneath usually dark in color but variable, abdomen sparsely punc- 

 tate and alutaceous. Legs variable, femora piceous, tibise pale. Length .08 

 inch; 2 mm. 



This species varies in color but is known by its comparatively 

 smooth thorax. The fully colored specimens are entirely piceous 

 above and beneath, except the tip of the elytra which has a well 

 limited pale yellow spot. As the specimens become generally paler 

 the spot extends forward in an irregular vitta as in certain forms of 

 variahilis. I have never seen any pale testaceous forms of this species, 

 unless several small specimens of otherwise doubtful nature be referred 

 here which I have seen from Florida. 



Occurs from Massachusetts to Indiana. 



C impressus Lee. — Oblong oval, slightly broader behind the middle, 

 feebly convex, rufo-piceous, pubescent. Head densely punctulate. Antennse 

 half the length of body, pale. Thorax twice as wide as long, slightly nar- 

 rowed in front, apex and base bisinuate, sides feebly arcuate, margin not 

 explanate, surface densely punctured, even more so at the sides. Elytra 

 scarcely wider at base than the thorax and broader behind the middle, sides 

 feebly arcuate, disc subdepressed, subsutural costa moderately well marked, 

 surface less densely punctured than the thorax but near the base a little more 

 coarsely, near the apex more finely and sparsely. Body beneath sparsely 

 punctulate and alutaceous. Legs pale. Length nearly .10 inch ; 2.5 mm. 



Of this species two females only are known to me. They have 

 on the disc of the elytra, a short distance behind the scutellum, an 

 arcuate shallow impression which crosses the suture, on each elytron 

 about one-third from the apex is a deeper impression placed obliquely, 

 the two converging posteriorly toward the suture approaching it 

 very closely. 



There is no species in our fauna with the thorax as densely punc- 

 tured as this one. 



OcViurs at Tampa, Florida. 



Tribe V. — PlaconycMni. 



Front narrow, artennoe closely inserted. Anterior cosse without 

 trochantin. Tarsi slender, claws with slender membranous lobes 

 arising from the base. (PI. I, fig. IG c). 



In these few words a tribe is suggested containing a single species 

 possessing the oral organs of the Eubriini, a prosternum approach- 

 ing the Hehdini with a structure of tarsal claw entirely unique in 

 the family. 



The genus is characterized as follows : 



