246 NEOTROPICAL PSELAPHIDAE 



visible stemites (morphological II-VI), with the last entirely, circularly im- 

 pressed for median third of segmental width. 



Metastemum simply, slightly, longitudinally impressed in apical half. 



Coxae, trochanters, femora, tibiae and tarsi normal, save for the inter- 

 mediate femora. Each of the latter with a spine at base of the ventral face. 

 This mesofemoral spine is long (one-fourth as long as femur), apically in- 

 clined instead of erect, and very conspicuous. 



Allotype Female. Similar to holotype, save that (1) pronotum laterally 

 is normal, lightly punctulate, and closely invests the anterior coxae and proster- 

 num; (2) prosternum simple; (3) last tergite and last stemite simply tumid 

 and punctate; (4) legs not armed. 



Described on five specimens collected on Barro Colorado Island, Gatun 

 Lake, Panama Canal Zone. Holotype male (July 25, 1936) collected by the 

 author from decayed log mold at Drayton 15; one male paratype and two 

 female paratypes (May 2, 1935) collected by Alfred Emerson from the galleries 

 of a termite nest, probably Coptotermes niger Snyder, in a fallen tree ; allotype 

 female (August 15, 1935) collected by Alfred Em,erson from decaying log mold. 



The species of Oxarthrius may be listed as follows: 



Subgenus Oxarthrius, s.s. 



anthiooides (Schaufuss). 1887. Brazil. (Batrisus) 



armatus (Raffray). 1897. Yuracaris, Bolivia. (Batrisus) 



attaphilus Bruch. 1933. Loreto, Misiones, Argentina, con Atta 



sexdens L. 

 bispinosus Reitter. 1882. Blumenau, Santa Rita, Brazil. (Genotype) 

 forticornis (Raffray). 1897. Yuracaris, Bolivia. (Batrisus) 

 hamaticollis (Sharp). 1887. Las Mercedes, Guatemala (3000 feet). 

 (Batrisus) nee hamatus of Raffray key, p. 437, 1897. 

 rivularis (Schaufuss). 1872. Panama. (Batrisus) 

 rugosicollis Raffray. 1917. Asuncion, Paraguay. 

 rugosus (Raffray). 1897. Yuracaris, Bolivia. (Batrisus) 

 simplex (Raffray). 1897. Yuracaris, Bolivia. (Batrisus); and from 



Perene Colony, El Campamiento, 

 Peru at 2000 feet (Fletcher, 1928). 

 sternadens new species. Panama Canal Zone. 



Subgenus Baroxarthrius new subgenus 

 escharus new species. Panama Canal Zone. 



ITETICUS (Raffray, 1904) 



Raffray (1897) (Batrisus) 

 Raffray (1904, 1908, 1909, 1911) 



This is a purely South American genus of eight species found so far only 

 in Brazil and Bolivia. It was erected in 1904 (p. 140) for seven species described 



