5 PROCKEDIXGS OF THE NATIONAL MUSEUM vol. 



Since the male sex of pallipes is still unknown, the above key is 

 based only on the female sex. The male of N. pilipes is generally 

 similar to the female in coloration but differs most remarkably in the 

 extremely long dorsal fringes of setae on the tibiae and, less accentu- 

 ated, on the basitarsi. 



The South American species of Nemopalpus differ conspicuously 

 from those of the old world in the venation, ^2+3 being very elongate, 

 exceeding three times Ro alone; r-m and the basal section of R5 lie far 

 distad, being connected posteriorly with Mi far beyond the fork 

 of Mi+2. 



NEMOPALPUS PILIPES Tonnoir 



1922. Xemopalpu.-i yUipen Tonnoir, Ann. Soc. Ent. Belgique, vol. 62, pp. 130- 

 134, 8 figs. 



Tonnoir's description and figures are so complete that nothing fur- 

 ther need be added. The species was described from material taken 

 in Paraguay by Fiebrig. One additional male was taken at the 

 Iguazu Falls, Argentina, October, 1927, by R. C. and Elnora Shan- 

 non, now preserved in the National Collection. 



NEMOPALPUS PALLIPES (Shannon and del Ponte; 



1927. Bruchomyia pallipes Shannon and del Ponte, Rev. Inst. Bact., Buenos 

 Aires, vol. 4, pp. 733-734. 



The type of paUipes, a female, was taken at Iguazu Falls, Misiones» 

 Argentina, June 21, 1927, by R. C. Shannon. The type was very 

 kindly loaned to me for studj^ by Mr. Shannon and Doctor Aldrich 

 and a few supplementary notes are given. 



Female. — Length about 4 mm.; wing 5 mm. 



The species is undoubtedly closely allied to N. pilipes, but differs in 

 the black coloration of the setae of the body and wings and the 

 more conspicuously whitened tarsi. 



Antennae pale, the setae black; IG-segmcnted, with an additional 

 microscopic terminal button, as in the genus. Venation as in pilipes, 

 Scx being distinctly preserved; i?2+3 very elongate, the fork corre- 

 spondingly shortened; basal section of i?5 and r-m in transverse 

 alignment, both far beyond the fork of i/1+2; distal section of Cui 

 very short. The long conspicuous crests of setae on head and thorax 

 nearly black. Costal fringe very long and dense, brownish black, 

 with paler hairs becoming more numerous on the distal half, the col- 

 oration of the fringe fully as dark as the hair patches on the disk, 

 which are thus relatively inconspicuous. Legs with the vestiture 

 appressed, with only scattered erect setae, dark-colored, those of the 

 tarsi creamy, producing a pallid effect. 



r///>e.— Female, Cat. No. 41580, U.S.N. M. 



