20 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 77 



silvery white pubescence intermixed. Prosternum sparsely clothed 

 with long, erect black hairs. Anterior leg's short; anterior femora 

 robust and gradually clavate. Middle femora strongly arcuate, and 

 strongly, abruptly clavate. Posterior legs long ; femora strongly ar- 

 cuate, and strongly clavate on apical two-thirds; tibiae cylindrical 

 and slightly sinuate. 



Length, 8.4 mm. ; width, 2.8 mm. 



Type locality. — Rio Negro, Bolivia. 



7V??e.— Cat.'jSTo. 42829, U.S.N.M. 



Described from a single male collected at the type locality during 

 January, 1922, by William M. Mann with the Mulford Biological 

 Exploration in Bolivia during 1921-1922. 



This species is allied to quadratifennis Bates, but differs from that 

 specie's in having the antennae brownish black, the transverse basal 

 depression on pronotum densely clothed with golden yellow pubes- 

 cence, the oblique ivory white vitta on each elytron not extending 

 to the base or apex, and the underside of the abdominal segments 

 broadly clothed along the posterior margins with silvery white or 

 golden yellow pubescence. 



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