82 GEO. H. HORN, M. D. 



CEBRIONID^. 

 Our genera in the books at present are three in number separated 

 as follows : 



Labrum entirely connate with the front Anachilns. 



Labrum separated by a suture from the front. 



Anterior tibiae entire Cebrio. 



Anterior tibiae emarginate externally Scaptolenus. 



In studying the specimens of Anachilus in the cabinet of Dr. Leconte 

 all are without suture between the labrum and front, of the four in my 

 cabinet, one has a distinct suture, one less distinct, and two no suture 

 at all. Extending the study to Cebrio the same thing happens, and 

 specimens occur with a very distinct and probably flexile suture to others 

 where there is absolutely no trace whatever, the front and labrum being 

 perfectly continuous. As there is no other difference between Anachilus 

 and Gehrio the former must be suppressed. 



The species of Cebrio have been separated by the form of the labrum 

 (emarginate or not), and maxillary palpi, (terminal joint equal to a shorter 

 than the preceding). 



I have had before me. about three dozen, perhaps more specimens, 

 and besides observing that some have the labrum and front cari- 

 nate, the labrum has the anterior margin arcuate in some, truncate 

 in others or emarginate, and in several deeply triangularly incised, 

 and between all these forms every interniediate degree. The maxillary 

 palpi moreover do not possess that degree of difference in structure 

 which enables us to separate species thereby, and I have therefore been 

 compelled to abandon both the above mentioned characters and unite 

 all three species in one. 



By the suppression of Anachi/us and the occurrence of one new, there 

 are three species in Cebrio in our fauna as follows : 



Antennae distinctly serrate, the terminal joint rather suddenly constricted at tip; 

 elytra distinctly striate. 



Presternum between the coxfe extremely narrow; mandibles very prominent 

 not capable of closure beneath the labrum inaiidibiilaris Lee. 



Prosternum between the coxpe not linear; mandibles more robust and when 

 closed are in great part concealed at their base. PI. II, fig. 7...bicolor Fab. 

 Antennae feebly serrate, terminal joint not constricted at tip; elytra not striate. 

 Mandibles very feebly prominent estl'iatllS n. sp. 



In a revision of the Cehriomdpe (Ann. Fr. 1874, p. 534), Chevrolat 

 retains the generic name Selenodon for our species, but for what reason 

 he docs not state nor can I find out. 



€'. l»icj»Ior Fab. — Upper side brownish, piceous or castaneous, sparsely 

 |ml)esccut, beneath and legs testaceous. Head coarsely and densely punctate. 

 Thorax punctured but less densely than the head. Elytra moderately deeply 



