494 Mr. G. J. Arrow on the 
clypeus being without the two diverging ridges and the 
frontal carina wider. In the Australian form the latter is 
one-third the width of the clypeus, and in the present 
variety one-half, 
The distribution of the large and curious genus Bolbo- 
ceras is exceedingly interesting. Widely scattered through 
the Old and New Worlds, it is well represented in India, 
and reaches its highest development in Australia, where the 
species are more numerous and attain larger ‘and more 
striking forms than in any other part of the world. It 
might, therefore, be expected that it would also be found 
distributed through the chain of islands that connects the 
two continents ; but this is not the case. The little group of 
species separated from Bolboceras by M. Boucomont under 
the name of Bolbochromus occurs in Java, Borneo, Sumatra, 
and Celebes, but no true Bolboceras is known from that 
region, and no member of the family has been hitherto 
known from the Papuan Region. ‘he present apparent 
exception is evidently a straggler from Australia, and not a 
link with Oriental species. We must conclude, therefore, 
that these insects have not entered Australia from that 
region, but belong to the primitive fauna of the country. 
This is confirmed by the fact that, as in the case of many 
other peculiar Australian animals, ae nearest allied forms 
are to be found in America—a group of species of Bolboceras 
occurring in Chili which is quite unconnected with the other 
iemeng species, but has evident affinities with the 
Australian. 
Onthophagus laratinus, sp. n. 
Niger, nitidus, capite et prothorace leviter cupreis, pedibus an- 
tennisque rufo-piceis, harum clava nonnunquam flava; late 
ovatus, parce setosus, capite haud dense, subrugose punctato, 
nitido, antice obtuse bidentato; pronoto fortiter ineequaliter 
punetato, modice convexo; elytris subtilissime coriaceis, striatis, 
striis vix punctatis, interstitiis sat remote punctatis, punctis 
breviter setiferis, interstitiis alternis longitudinaliter carinatis, 
carinis nitidis, punctis setiferis interruptis ; pygidio parce longius 
setoso : 
3, clypeo paulo longiori, postice leviter transversim tuberculato, 
vertice bicornuto, cornubus fere rectis, leviter divergentibus, 
retrorsum inclinatis, basi intus paulo dilatatis; tibia antica 
apice truncata, paulo inquinata, haud calcarata, lateraliter tri- 
dentata et serrata : 
2, vertice bituberculato, tibia antica lateraliter acute quadri- 
dentata, apice fortiter calcarata. 
Long. 8-9 mm.; lat. max. 4-5°5 mm. 
