Coleojoterological Notices. 497 



Elytra slightly abbreviated, exposing the pygidium; posterior tarsi 



3-jointed in the males Monotominve 



Tarsi pentamerous in both sexes. 



Antenna? moniliform ; mentum extremely large, concealing all the organs 



of the mouth Rhysodin^e 



Antenna? with a 2-jointed club ; mentum very large, concealing the 



maxilla? at the sides Lyctin^ 



Antenna? with a 3-jointed club ; mentum always moderate Silvanin^e 



Antenna? filiform, the first joint usually long ; labial palpi with the third 

 joint very strongly developed ; tarsi with the first joint small. 



Brontin/e 



Tarsi pentamerous in the female, heteromerous in the male, the first joint 



small ; antenna? very variable, submoniliform, filiform or clavate ; labial 



palpi with the last joint variable Cucujin^ 



Tarsi heteromerous in both sexes, broadly dilated, the penultimate joints 

 bilobed, first long ; antenna? combining the elements of the Brontina? and 

 Rhysodina?, thick, monilo-filiform, the elytra slightly abbreviated as in 

 the Monotomina? Hemipeplin^e 



These subfamilies, while exhibiting the most diverse and bewilder- 

 ing affinities and cross affinities in various external directions, are 

 nevertheless so intimately bound together by certain general pecu- 

 liarities of organization, that we are compelled either to regard 

 them as constituents of one very composite family, or to consider 

 each as a distinct family. There seems to me but little doubt that 

 the former is the better course to take. 



The Passandrina? include three tribes, Passandrini, Prostomini 

 and Xartheciini, depending upon the nature of the jugular pieces 

 and the antennal structure. 



The Colydiinas comprise the genera at present composing the 

 family Colydiidaa, the Murmidiini forming a tribe allied to Cery- 

 lonini and not a subfamily. 



The Monotomina? include two tribes, Monotomini and Myrme- 

 chixenini, Hypocoprus bearing a relation to Monotonia which is 

 almost precisely ecjuivalent to that borne by Smicrips to Rhizo- 

 phagus. Through the Monotominae the Cucujidaa are connected 

 with the NitidulidaB by way of the Rhizophagini. In the Mono- 

 tomini the number of tarsal joints is four throughout, with the third 

 joint rather smaller than the others, especially in the anterior, but 

 in the males the posterior tarsi are 3-jointed through the elimination 

 of the first joint; this is an additional point of similarity between 

 Monotominae and Cucujinae. 



The Brontina? may be divided as follows: — 



