240 NEOTROPICAL PSELAPHIDAE 



sulcata and with the apical margin medianly minutely tuberculate; fifth large, 

 sparsely but distinctly punctate, transversely semilunar in shape, two-thirds as 

 long as first four united, basal third tumid, apical two-thirds semilunarly im- 

 pressed, apex with the margin raised and medianly sharply, triangularly incised; 

 sixth (last) sternite minute, tumid, coarsely punctate, transversely subfusiform 

 in shape, lying between the concave median apex of the last tergite and the 

 incised margin of the fifth sternite. 



Metasternum subglabrous, with a deep median, longitudinal sulcus; this 

 sulcus is sharply defined but with rounded lateral margins, and is not entire, 

 being abruptly limited at apical third. 



Tarsi as in Arthmius. Anterior femora compressed at apical fourth on ven- 

 tral face to give a subcarinoid appearance at this point; other femora simple. 

 Anterior tibiae with a highly specialized spur, this spur being nearly half tibial 

 length, inserted just beneath base of first tarsomere, flat, angulate medianly, 

 and with a spatulate tip; intermediate tibiae with a strong, acute, simple spur 

 of regular length ; posterior tibiae simple. Intermediate trochanters with the pos- 

 terior face flattened and bearing a pad of short, dense setae; other trochanters 

 simple. 



Described on one male, the type, from Corumba, Matto Grosso, Brazil. 

 Most closely related to dama, from which it is distinct on antennal propor- 

 tions, vertexal tubercle, genal structure and sternite structure. 



In the original diagnosis of Syrmocerus (Raffray, 1897, p. 459) it is clearly 

 stated that a transverse pronotal sulcus is present. Raffray (1904, p. 125 and 

 1908, p. 134) in his keys states that the transverse pronotal sulcus is present; 

 in the 1908 discussion of the genus, Raffray states (p. 153) that the transverse 

 pronotal sulcus is absent. I have followed the original diagnosis in order not to 

 create a new genus. 



The species of this genus follow: 



cervus (Raffray). 1897. Minas Geraes, Brazil. (Arthmius) 



dama (Raffray). 1897. Brazil. [Arthmius) (Genotype) 



gazella (Raffray). 1897. Brazil. [Arthmius) 



guarinus new species. Corumba, Matto Grosso, Brazil. 



rugiceps (Raffray). 1897. Brazil. [Arthmius) 



OXARTHRIUS (Reitter, 1882) 



Reitter (1882) 



Sharp (1887) [Batrisus) 



Raffray (1897) [Batrisus) (1904) [Ozarthrius) (1908, 1911, 1917) 



Fletcher (1928) 



Bruch (1933) 



This is an entirely neotropical genus of twelve species: Guatemala (1), 

 Panama (1), Panama Canal Zone (2), Brazil (2), Peru and Bolivia (4), Para- 

 guay (1) and Argentina (1). It is not known north of Guatemala and the spe- 

 cies appear to be rather thinly distributed over a great area and uniformly un- 

 common. 



