ATTAPSENIINI 349 



each side, is furnished with a row of ten to twelve long, trichomatous, setae 

 which project into the depression and, therefore, appear to be analogous to 

 the trichomes of Fustiger, Adranes, and other clavigerid aggregates. This basal 

 depression occupies more or less of the first two tergites, and the remaining 

 tergites are convex, short, and without lateral margins. Six sternites. 



Mesosternum trapezoidal-subrectangular. Metasternum obconical in opti- 

 cal outline, medianly excavated, and with the posterior margin medianly and 

 deeply incised. Anterior coxal cavities confluent, their coxae subtriangular. 

 Intermediate coxal cavities confluent, their coxae large and globose; inter- 

 mediate legs typically macrosceline. Posterior coxae subtriangular. 



Femora and tibiae arcuate; the tibiae dilated and compressed for basal 

 third to half of length. Tarsi three-segmented; first short; second and third 

 very elongate (about three times longer than first tarsomere, with the third 

 slightly longer than second) ; two long, subequal, tarsal claws. 



ATTAPSENIUS (Bruch, 1933) 

 Bruch (1933) 

 Reichensperger (1936) 



This genus is described above, it being the only genus of the tribe. 



The two species may be separated as follows: 



Antennomere I straight, cylindrical, longer than next two united; 

 II-X subquadrate, progressively slightly wider, very closely 

 articulated; XI oblong-oval, as long as the preceding three or 

 four segments united; 2.3 mm. long chernosvitovi 



Antennomere I elongate-cylindrical; II-VI smaller, one and one-half 

 times longer than wide ; VII very short ; VIII quadrate ; IX and X 

 broader and longer; XI elongate-cylindrical, longer than the three 

 preceding segments united; 3.2 mm. long (or 4 mm. long if the 

 curvature of the abdomen is taken into consideration) . .eicfmawm 



These two remarkable species may be listed: 



chernosvitovi Bruch. 1933. Loreto, Misiones, Argentina. Genotype. 

 eidmanni Reichensperger. 1936. Mendes, Est. Rio, Brazil. 

 Both from the nests of the leaf-cutting ant, Atta sexdens L. 



