ambulator Sturm, Cat., 1826, p. 121; americanus Gmel., ed. Linn., I, 4, p. 1854: 

 aspericollis Germ. Ins. Spec. Nov., p. 517. 



Length 5—18 mm. = .2c— .72 ins. Hal). N. II., Mass.. Can., X. Y., La., Pa.. 

 Va., Del., X. C, X. J.. Tex., Iowa, Ga., Kans., Neb. 



I have included this species with those having spinose femora and 

 elytra, although in small specimens the spines are very small. The anterior 

 ridge of pronotum very prominent in large specimens is also scarcely 

 visible in small ones. Color reddish brown, except beneath and elytra 

 behind first band more or less black. Elytra bands yellow. 



N. approximatus Lee. Proc. Ac. Phil., 1S62, p. 42. 



Length 10 mm. = .56 ins. Hal). Kansas. 

 1 have seen only one specimen in Dr. Horn's collection ; reddish 

 brown with yellow bands. 



N. balteatus Lee. S. M. C, 1S73, p. 201. 



Length 14 mm. = .56 ins. Hah. Oregon. 



This I have not seen. The color is described by Dr. Leconte as 

 fusco piceus with yellow markings. The sketch we owe to Dr. Horn's 

 kindness. 



N. interruptus Lee. S. M. C , 1873, p. 201. 



Length 10 mm. = .40 ins. Hab. California. 

 I have seen one specimen in Dr. Horn's collection, reddish brown 

 with yellow markings. 



The three species above named though closely resembling each other 

 and eryihrocephalus, appear to be very distinct. They appear also to be 

 equally rare. 



N. conjunctus Lee. Ent. Kept., 1857, p. 61. 



Length 8—16 mm. = .32 — .64 ins. Hab. Cal., Or. 

 Black with yellow or white bands. In a large series I find no var- 

 iation except in size. 



N. capraea Say. J. A. P., Ill, 1823, p. 424; Am. Ent., Ill, t. 53; Lee, J. A. 

 P., ser. 2, II, p. 26; elevatus Lap & Cory, Mon., p. 32, t. 7, i". 40; gibbicollis Lap 

 ami (lory. Mon., p. 24, t. 6, f. 28. 



Length 12—20 mm. — .48— .80 ins. Hab. Ark., Pa., Mass., La., Va., Kans., 

 Mo., X. Y., Mi>s., Neb., Texas. 



Black with bands of yellow or occasionally white. The thorax is 

 usually entirely black, but in two specimens before me, from Texas, the 

 quadrate spaces between the thoracic ridges are entirely clothed with 

 silvery white hair. 



N. ascendens Lee. Bull. Geol. and Geog. Surv., IV, 1878, p. 462. 



Length %\ mm. = .34 ins. Hab. Colorado. 



This, species I have not seen and our figure is copied from a sketch, 

 made by Dr. Horn, of the only specimen known in Dr. Leconte's col- 

 lection. It is described as elongate and similar to muricaiulus in form and 

 sculpture, but thorax less muricate and more coarsely punctured toward 



