CURCULIONID.A—A LOPHIN As. 69 
three exceptions (of two genera), are confined to Florissant; indeed, the 
prevalence of the subfamily may be considered as one of the characteristic 
features of the Lacustrine fauna, for not only are the species relatively 
numerous but they are exceptionally abundant in individuals; of the Curcu- 
lionidze which have fallen under review, about two-fifths of the specimens 
belong here. The relative predominance of the family may be made more 
conspicuously apparent by a statement of percentages: The proportion of 
Alophinz to other Curculionidze in the existing North American fauna is 
in genera about 44 per cent; in species, less than 2 per cent; while in the 
American Tertiary fauna the relative proportion of genera is 10 per cent 
and of species not less than 14 per cent. Whether any similar prevalence 
of the subfamily in Kuropean rocks can be discovered is uncertain, but I 
am inclined to look upon the numerous species of Rhynchophora which 
have been referred to Hipporhinus as belonging here, in which case this 
could probably be asserted, at least to a certain extent. 
Table of the genera of Alophine. 
Prothorax largest beyond the base, being more or less tumid. 
Largest forms of subfamily. Prothorax relatively small, only half as wide 
as the elytra at their base; beak dorsally channeled.-...--..-.-. Centron. 
Smallest forms of subfamily. Prothorax relatively large, not much narrower 
than the elytra at their base; beak not channeled...........- Limalophus. 
Prothorax largest at the base, more or less tapering beyond. 
Prothorax ample, tapering but little, the head abruptly smaller and 
SHORU pee sotto Steet Ore Leak peeps ere ce StS eka peas Seis ose bs Geralophus. 
Prothorax and head together subconical, tapering regularly from base of 
prothorax, the head fully half as long as thorax..........-...-. Coniatus. 
CENTRON (xévtp@rv), gen. noy. 
IT am somewhat at a loss just where to place the insect here described, 
represented by a couple of specimens which appear to belong together but 
are preserved in different attitudes, so as to render the determination 
somewhat insecure. All the characters drawn from the under surface of 
the body are taken from the specimen not figured. The form and size of 
the rostrum, the prolongation of the antennal grooves to its tip, the trans- 
verse eyes narrowed below, the subglobular form of the heavily pitted 
