BRACHYGLUTINI 175 



ninth; known from a single specimen of unspecified sex, probably 



female; 1.5 mm. long; El Reposo, Guatemala batrisoides 



Antennal segments III-X small, similar; 1.33 mm. long; based on a 

 male with concave metastemum simulatrix ^ 



6. Antennae with segments III-VIII slightly progressively shorter; IX 



and X subtransverse, slightly larger than eighth and crescentric in 

 form; metasternum slightly flattened; 1.7 mm. long; known from a 



female from Bahia, Brazil grouvellei 



Antennae not so formed 7 



7. Antennal segment I with the dorso-intemal angle produced into a 



tuberculate tooth in the male sex tuber culijer 



Antennal segment I not so formed 8 



8. Antennal segments III obconical; IV-VIII subelongate-quadrate ; IX 



obconical, twice as long as eighth; X slightly quadrate; male from 



San Esteban, Venezuela; 1.5 mm. long caloaratus 



Antennal segments III-VIII longer than wide; IX elongate-obconical; 



X slightly transverse ; metasternum elevated and triangular in form ; 



male from Blumenau, Brazil; 1.4 mm. long politissimus 



This key does not take into account formicarius of Colombia. The species 

 may be listed as follows: 



batrisoides Sharp. 1887. Guatemala. 

 calcaratus Raffray. 1891. Venezuela. 

 cristatus (Schaufuss). 1897. Mexico. (Bryaxis) {Eutrichites by Raffray 



in error, cf. 1904, p. 209). 

 formicarius Raffray. 1900. Colombia. 

 grouvellei Raffray. 1896. Brazil. 

 longiclava (Schaufuss). 1887. Cuba. (Bryaxis) 

 -politissimus Raffray. 1904. Brazil. 

 simulatrix (Sharp). 1887. (Bryaxis). Guatemala. 

 sternalis Raffray. 1904. Grenada, Windward Islands. 

 tuberculifer Raffray. 1912, Argentina, (con Atta lundi Guer.) 



Buenos Aires, Argentina (Bruch, 1929) 



MITONA (Raffray, 1904) 



This genus, allied to the North American Anchylarthron, as well as 

 Xybaris, Pselaptus, and allies, is found in northern and northwestern South 

 America. The mesost^mum is bicarinated, and advanced between the middle 

 coxae as a short, flat plate, these coxae distant. Metasternum wide and flat- 

 tened. The short, subquadrate, slightly convex body, and narrow, slightly 

 elevated abdominal margin is similar to Pselaptus. The complete lack of 

 lateral pronotal foveae separate it from Xybaris. 



The species may be separated as follows: 



^ This species, described by Sharp from Paraiso, Guatemala, may not be Pselaptus at 

 all. Raffray (1908) places it in Pselaptus and states of the genus that there are no pronotal 

 foveae of any kind. Sharp (1887, p. 31) says that the pronotal base is produced in front 

 of scutellum and has a very minute fovea in middle close to the base ! 



