AMERICAN COLEOPTERA. 229 



Group 4. — Thorax transversely oval, very little narrowed behind, sides and base 

 broadly margined, the sides usually feebly arcuate or even slight- 

 ly sinuate, anterior sinuous impression distinct. Tibiffl straight. 

 Disc of thorax glabrous. 



Antennal club orange, first joint piceous piistiilaius Ilersch. 



Autennal club black VCSpilloides Ilbst. 



Disc of thorax densely pubescent. 



Antennal club piceous toiuentosus Weber. 



As our species are so few in number it has not been deemed neces- 

 sary to reduce them to any tabuhir arranf:;ement. To those who desire 

 to make sucli a table the form of the tibiae whether curved or straight 

 will form a convenient point of departure. 



N. carolinas Linn. — Form moderately elongate, head and thorax in repose 

 rather strongly deflexed. Head black, shining, rather coarsely punctured, the 

 lateral impressions moderately deep, rhinarium triangular, piceous. Antennae 

 black, the club entirely orange-red. Tliorax oval as long as wide, narrowed 

 behind, anterior angles broadly rounded, sides behind the middle slightly sinu- 

 ate, base broadly arcuate, sides very narrowly margined, base more broadly, 

 disc convex and without transverse impression, surface densely punctured in 

 its apical third, more coarsely but less densely along the sides and base, the 

 remainder of the disc shining and very sparsely punctate. Seutellura slightly 

 convex posteriorly. Elytra not wider than the tliorax and very little longer 

 than wide, sides feebly divergent to the outer apical angle, apex squarely trun- 

 cate, lateral marginal line very feebly elevated, the epipleural fold narrow, 

 surface feebly shining, sparsely punctate and slightly wrinkled, color black, 

 each elytron with small subhuraeral spot, a subbasal fascia broadly interrupted 

 at middle attaining the lateral margin and joining the humeral spot by a 

 narrow line, near the apex a reniforra spot which does not reach either the 

 margin or suture. Abdomen above subopaque, sparsely punctate. Body be- 

 neath black, shining, metasternum with short yellowish hair. Middle and 

 posterior tibise slender at base, rapidly broader toward the apex, the posterior 

 arcuate in both sexes. The outer spur of the anterior tibiae much stouter than 

 the inner in both sexes. Length .80—1.12 inch ; 20—28 mm. (PI. V, fig. 1). 



The male has the anterior tarsi dilated and the posterior femora 

 stouter than in the female. The hind trochanter is prolonged in a 

 short acute spine in both sexes. 



This species is one of the most peculiar in our fauna. It seems to 

 have shorter legs than the others, while the lateral marginal line of 

 the elytra is scarcely prominent and the inflexed portion very narrow. 

 Its markings are almost invariable. 



Occurs in the Gulf States. 



S. americanas Oliv. — Form robust, black, vertex, disc of thorax, two 

 elytral fasciae and epipleural fold, orange-red. Head almost impunctate, lateral 

 impressions moderately deep enclosing the large orange-red space, rhinarium 

 red. Antennce black, club entirely orange-red. Thorax orbicular, truncate in 

 front, wider than long, sides and base with a broad deplanate margin, disc 



