290 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io6 



Superfamily TRIDACTYLOIDEA 



Family Rhipipterygidae 



Genus Rhipipteryx Newman, 1834 



The collection contains several species of this genus which are 

 nearly similar in the general shape and coloration but quite different 

 in the shape of the abdominal extremity of the male. The females 

 are almost impossible to separate. 



Rhipipteryx difformipes, new species 



Figure 6,m,n 



Holotype: Male; Divisoria, elevation 1,600 meters, about 80 miles 

 southwest of Pucallpa, Peru, 1947, Schunke (USNM 62095). 



Male: Small, of a dull black color. Antennae composed of 10 

 joints, black; 3d to 6th joints yellowish above, 9th joint almost com- 

 pletely yellow; last joint longer than the preceding, black. Pronotum 

 with lateral maigins rather narrowly tinged with yellowish. Aleta- 

 notum prolonged caudad in a sharp point. The three first abdominal 

 tergites are partly united, presenting a strong, rounded, shining tume- 

 faction; 4th tergite with a A-shaped projection; 10th tergite pro- 

 longed in a plate strongly divided at apex with projecting, rounded 

 angles. Cerci extending a httle beyond the plate, cylindrical; proc- 

 ess of the paraprocts not so long as the subgenital plate, flattened, a 

 Httle widening at apex. Subgenital plate narrowing towards the 

 extremity, which is notched with a small, acute, median projection. 



Anterior legs black; tibiae strongly compressed with an internal 

 groove in which the tarsus is located. Median femora for the most 

 part yellow with black top; tibiae strongly out of shape, roundly 

 dilated at base, then compressed, twisted with external face furrowed 

 above. Posterior femora black; tibiae yellowish; large apical spurs 

 long and slender; metatarsus a little shorter, compressed, acute at 

 apex. 



Elytra dull black; wings very elongate, black on the anterior margin, 

 with iridescent posterior field. 



Length of body with wings 7-8 mm.. 



Rhipipteryx vicinus, new species 



Figure 6,o 



Types: Holotype: Male; Divisoria, elevation 1,600 meters, about 

 80 miles southwest of Pucallpa, Peril, 1947, Schunke (USNM 62096). 

 Paratypes: Same data as holotype (ScTcT); Fundo Sinchono, Peru, 

 Aug. 15, 1947, Schunke (1 cT) (USNM). 



Male: Very close to the preceding. Differing by the yellow band 

 of the pronotum, which is wider, and chiefly by the shape of the ab- 



