198 NEOTROPICAL PSELAPHIDAE 



inadequate description and my Decarthron euspinifrons. If monoceros Sharp 

 turns out to be a Decarthron, then it will have to have another name due to 

 monoceros (Schaufuss), 1882, of Dutch Guiana. Sharp's species is undoubtedly 

 valid and monoceros (Sharp), monoceros (Schaufuss), and euspinifrons new 

 species are quite obviously all distinct on many structural features. The ques- 

 tion turns on whether Sharp's species is Decarthron or not. The question can 

 not be settled without recourse to the type but I am inclined to place monoceros 

 Sharp as non-brachyglutine on the strength of his reputation since, in order to 

 make the mistake he would have to: (1) count eleven antennal segments for ten, 

 (2) find a transverse pronotal sulcus (his species was in the subgenus Arthmius 

 of "Batrisus" and Decarthron has no such sulcus, a fact which was known to 

 Sharp), (3) fail to see the abdominal margin, and many other obvious features, 

 involving tarsal claws, ventral surface of head, et cetera. 



Just what monoceros Sharp is I do not know. It is certainly not Batrisus 

 as now limited; probably not Decarthron for reasons just stated. If in the 

 Batrisini it may form the type of a new neotropical genus. For the present we 

 must leave it unplaced. 



The species of Decarthron may be listed as follows: 



Subgenus Decarthron 



I 



bicolor Raffray. 1904. Chile. 



binodosum Raffray. 1908. Argentina. 



corpulentum (Schaufuss). 1887. Minas Geraes, Brazil. {Bryaxis) 



fractifrons Fletcher. 1928. Vera Cruz, Vera Cruz, Mexico. 



hetschkoi Raffray. 1904. Blumenau, Brazil. 



fmacrocephalum (Schaufuss). 1887. Brazil. (Bryaxis) 



simplex Raffray. 1908. Argentina. 



II 



cochlearifer (Schaufuss). 1879. Mexico. (Bryaxis). Also Guatemala 



teste Sharp, 1887. 

 dimissionis (Schaufuss). 1887. Brazil. (Bryaxis) 

 hirsutum Raffray. 1908. Argentina. 

 soror (Schaufuss). 1887. Mexico. 



Ill 



sulcipes Raffray. 1904. Yuracaris, Bolivia. 



V 



tritomum Raffray. 1904. Blumenau, Brazil. 



VI 



arthriticum Raffray. 1904. Sierra de Durango, Mexico. 

 chichion new species. Panama Canal Zone. 



