AMERICAN COLEOPTERA. 231 



As in amfricanus and Sa^i ihk species has the v:vgue transverse 

 impression of the elytra, and it further agrees with the latter in the 

 presence of erect elytral hairs. Froui both these it differs in the 

 straight tibiaj. 



Widely distributed in the Atlantic region from Hudson's Bay 

 southward. 



N. Sayi Lap. — This species agrees in all the general characters of orbicoUis 

 except that the sides of the thorax are less arcuate, the epipleural fold of the 

 elytra entirely orange-red and the middle and posterior tihise arcuate in both 

 sexes. It is also generally smaller. Length .60 — .80 inch : f5 — 20 mm. 

 Occurs iu the northern part of the Atlantic region. 



N. marginatum Fab. — Moderately elongate, black, elytra bifasciate with 

 orange-red, epipleural fold red. Head minutely sparsely punctulate, lateral 

 impressions moderate, rhinarium large red. Antennae pieeous, club entirely 

 red. Thorax subcordate, broader than long, apex truncate, sides very narrowly 

 margined, sinuate near the base, base arcuate, more broadly margined, margin 

 punctured, disc convex very sparsely punctulate, median line obliterated, 

 anterior transverse impression nearly so. Scutellum flat, sparsely punctate. 

 Elytra not wider than the thorax, gradually wider from base toward apex, 

 sides nearly straight, apex sinuately truncate, surface sparsely punctate and 

 with feeble traces of two discal costse ; epipleural fold orange-red, disc with a 

 rather broad, dentate, post-basal fascia usually entire, rarely divided at the 

 suture, a second subapicai often reaching the apical margin. Abdomen above 

 and beneath sparsely punctate. Metasternum sparsely clothed with brownish 

 pubescence. Anterior tibise with equal spurs, the outer apical angle moderately 

 prolonged. Middle and hind tibiae stout at tip, the posterior alone distinctly 

 arcuate. Length .73 — 1,08 inch ; 18 — 27 mm. 



The males have the anterior tarsi dilated as usual and in both 

 sexes the posterior trochanters are moderately prolonged, and the 

 posterior tibias slightly pubescent on the inner edge. 



The elytral markings vary a little in the width of the orange-red 

 fascije, there are however no striking variations. The hind tibiae 

 being distinctly arcuate the relationship of this species is easily 

 defined, and by the exclusion of carolinus, amen'canus and Sa>/i\ by 

 their peculiarities in other parts of the body we have ohscurus alone 

 with which it might be confounded. 



Widely distributed, I have seen specimens from almost every part 

 of our country, Pacific and Atlantic. 



N. obsciirns Kirby. — Closely allied to marginatus in form, color and mark- 

 ings, and diflering as follows: Antennae black, club red with the first joint 

 black. Thorax with median line finely impressed, anterior transverse impres- 

 . sion well marked. Posterior tibise very distinctly pubescent on the inner edge. 

 Length 1.00 inch ; 25 mm. 



The only constant character is that found iu the club of the 



