— 5— 



occasional specimen of A', nauticus. The usual number is five, the anterior 

 being the most elevated. There are frequently other ridges at the sides 

 as well as the row down the middle, and there is a tendency to coalesce, 

 which in two species is carried to the extreme, and the row of transverse 

 ridges becomes one broad longitudinal ridge, rugose at top. The form 

 of the ridges and the femoral species, and the form of elytral tip, which 

 seems very constant in this genus, serve to divide the species as follows : 



Middle and posterior femora spinose at apex. 



Thorax with a longitudinal elevated ridge, rugose at apex, antenna; filiform. 



Elytra truncate, spinose: thorax with apical basal and middle pubescent bands, 



scutellaris. 



Elytra truncate, spinose; thorax with apical and basal bands only luscus. 



Thorax with a middle and two lateral rows of transverse rugre, almost coalesced; 



an tenure thickened externally; elytra shortly acuminate irroratus. 



Thorax with a few distinct transverse rugae; antenna; filitorm or thickened on 

 middle joints; elytra obliquely truncate, spinose. 

 Thoracic ridges distributed over entire dorsal surface, thorax spinose at sides: 



pubescence white, in arcuate bands devastator. 



Thoracic ridges arranged in median row; pubescence yellow in straight bands 



only erythrocephalus. 



Femora not spinose; antennae filiform. 



Thorax with a few feebly elevate'd but distinct transverse rugre in median row; 

 sides of thorax simply punctured. 



Elytra transversely truncate ........ .approximatus. 



Elytra shortly acuminate balteatus. 



Elytra separately rounded interruptus. 



Thorax with many transverse rugre at middle and sides, strongly elevated but 

 more or less confused. 

 Elytra rounded at tip. 



Elytral bands forming two oval marks conjunctus. 



Elytral bands irregular (see figure) ascendens. 



Elytral bands forming one oval'and two oblique bands capraea. 



Elytra truncate at tip. 



Bands angulate or arcuate. 



Thorax wider than long muricatulus. 



Thorax longer than wide longipes. 



Bands straight, transverse torquatus. 



Of these species it may be noted that ascendens, approximatus, balteatus 

 and interruptus are known only by specimens in the cabinets of Dr. Horn 

 or the late Dr Leconte. The species do not vary in marking to the extent 

 noted in Xyloirechus. 



N. angulatus Fab. Ent. Syst., T, 2, p. 335; Chev., Mon., 1862, p. 531; 

 rhotribifer ( >li\\, Ent., IV, 70, p. 46, t. 4, f. 51; Lap & Gory, Mon., p. 17, t. 4, f. 19; 

 Lee, J. A. P., ser. 2, II, p. 26; Hopei Lap & Gory, Mon., p. 18, t. 5, f. 20; Lee, 

 1. c, p. 28. 



Length 11 — 15 mm. = .44 — .60 ins. Hab. Jamaica, Cuba, Georgia, N. Y. 



