Ts’ORTH AMERICAN COLEOPTERA. 
181 
Anthonomopsis). Third and fourth segments shorter than the for- 
mer, rarely (Alycodes, Elleschus and Euclyptus) very short. The 
fifth segment, aside from sexual differences as noted before, attains 
its greatest length in iVlycodes, Elleschus, Euclyptus and a few 
species of Anthonomus. 
The sutures are straight and deep, except the first, which is less 
deeply impressed (almost obsolete in Anthonomopsis) ; the latter is 
(aii’ved in Elleschus, Anthonomopsis and Euclyptus. 
The pygidium varies in size ; it is oblique and concealed in both 
sexes in Alycodes, Macrorhoptus, JMagdalinoj)S, Tachypterus and 
Elleschus; more or less exposed, at least in the male in all the others. 
The more perpendicular its position, the more freely exposed it be- 
comes. It is indexed in some males, where it fits into the emargina- 
tion of the last ventral segment ; this is most notably the case in 
Coceotorus, to a less extent in Anthonomocyllus and Xeomastix. It 
is narrowly excavated in a longitudinal direction in the subgenus 
Paranthonomus. 
Legs never very stout (except Nanops) ; thighs more or less cla- 
\ ate and generally toothed. Tibire generally slender ; posterior of 
male curved in Anthonomocyllus and Cnemocyllus ; toothed inter- 
nally in A. elegans and Leptarthrus irroratns. The apical armature 
requires more than a passing notice. It consists either of a hook, 
unguiculum, arising from the apical articulating surface, curved in- 
ward at almost a right angle with the tibial axis, or else a mucro, a 
prolongation of the internal apical angle into a point, in the direc- 
tion of or approximating to the longitudinal axis of the tibia. Being 
morphologically distinct, I have found differences in the armature 
of sufficient importance to be made use of in the separation of 
genera. The anterior and middle tibiae are unguiculate, and the 
posterior mucronate in the majority of genera. All are unguiculate 
in Alycodes, Tachypterus, Magdalinops, Macrorhoptus, Chelonychus, 
Anthonomopsis, Elleschus and Nanops. Acalyptus has the anterior 
and middle tibiae unarmed, the posterior feebly mucronate, while in 
Euclyptus all the tibiae are unarmed, and in Xanthus the armature 
becomes very feebly developed. 
Tarsi variable, never very stout (except some species of Elleschus) ; 
frequently long and slender ; third joint bilobed, spongy or pubescent 
beneath, fourth joint generally of moderate length (short in Elles- 
chus, very long in several species of Cnemocyllus). Claws somewhat 
approximate and armed with a large tooth in the great majority ; 
