180 
WILLIAM G. DIETZ. 
chedes) very prominent, and approximate upon the front; large, 
transver.sely oval and approximate beneath in ]\Iacrorhoptus. In a 
number of species the posterior margin of the eyes is more or less 
free and elevated, in consequence of which its surface is directed 
more anteriorly. 
Head more or less rounded or conical, not deeply immersed into 
the prothorax (except Cionistes). 
Prothorax wider than long (except A. brunnipennis) ; narrowed 
in front; anterior opening obliquely truncate (except Acalyptus). 
Very rarely (Macrorhoptus, subgenus Anthonomorphus and Tricho- 
baropsis) emarginate antero-inferiorly and giving a feeble appearance 
of postocular lobes ; base bi-emarginate, produced in front of the 
scutel ; latter small, oval or rounded, densely pubescent or scaly. 
Elytra variable, generally wider at the base than the prothorax ; 
striato-punctate (striae confluent at base in most Pseudanthononii). 
The outer margin shows the following variation: in those species 
having the elytra ample, that is, completely concealing the pygidium, 
the outer margin of one elytron forms a continuous horizontal line 
in its juxtaposition with the other and the outer stria unites with the 
sutural stria at an almost right angle. On the other hand, in those 
species in which the pygidium is freely exjiosed, the outer margin 
of each elytron ascends towards the apex, forming an angle in which 
the pygidium becomes more or less visible, and the outer and sutural 
strife unite at a more or less obtuse angle. In the text, the term 
dehiscent has frequently been used to denote the latter character, 
which varies greatly in extent, being most strongly marked in A. 
profimdus, elegans, etc., and scarcely noticeable in A. nebulosus, pe- 
ninsularis, etc. 
Prosternum short in front of eoxfe (long in Acalyptus, and mod- 
erately so in Anth. ipfipes and disjunctus). Anterior coxte contigu- 
ous, rather large and prominent ; middle coxje separated liy the 
mesosternum (subcontiguous in Magdalinops) ; the latter generally 
narrow, very rarely (subgenus Anthonomocyllus) wider than long, 
between the coxie. Metasternum moderately long (short in Antho- 
nomocyllus) ; side pieces narrowed posteriorly. Posterior coxfe 
widely separated (only moderately so in Magdalinops). 
Ventral segments variable in length ; subequal in Macrorhoptus, 
Tachypterus, Magdalinops, and some Anthonomi. First and second 
segments elongate (scarcely elongate, with the first segment short 
behind the coxie in Anthonomocyllus ; very strongly elongate in 
