548 PROCEEDINGS OP THE NATIONAL MUSEUM. vol.44. 



Legs : coxae and trochanters yellow, the former obscured ; remainder 

 of legs gone. 



Wings strongly tinged \^T[th yellow; costal cell hght yellowish- 

 brown; extreme base of cell second R, and tip of cell first R, broNvn; 

 a rounded wliite mark in cell first R, just above the fork of R2+3; 

 most of cell second Rj white; tips of cells R3 and R5 very pale, sub- 

 hyaline; veijis yellow, C, Sc and R more bro\vnish. Venation: Rs 

 very long, almost straight at its origin and about in a line with R2+3 

 and R3 ; Rj+j very short, shorter than the cross vein r-m; R, strongly 

 arcuated at its origin; Mi+, beyond cross vein m shorter than either 

 M, or Mj alone; basal deflection of Cu, beyond the middle of cell 

 first M3; second anal elongate sinuated. 



Abdomen: tergum light yellow, especially along the lateral mar- 

 gins of the sclerites; along the mid-dorsal line, darker, brown. 

 Hypopygium reddish-yellow. The genitalia suggest L. adusta Osten 

 Sacken and its alUes, and also Polymera, consisting of elongate, 

 cylindrical pleural pieces set with long pale hairs and bearing apicaUy 

 appendages which are dark colored, chitinized and denticulate on 

 their outer face. 



"Chile" (E. C. Reed, coll.). 



Specimen in U. S. National Museum collection. 



EXPLANATION OF THE PLATES. 

 Plate 66. 

 Fig. 1. HjTJopygium of Polymera obscura. 



2. Wing of Polymera superba. 



3. Wing of Polymera hirticornis. 



4. Wing of Polymera tiioracica. 



5. Wing of Polymera inomata. 



6. Wing of Polymera grisea. 



7. Wing of Polymera conjuncta. 



8. Wing of Crypiolabis tropicalis. 



9. Wing of Sacandaga parva. 

 10. Wing of Mongoma longifusa. 

 IL Wing of Mongoma extensa. 



12. Wing of Molophilus thaumastopodu.i. 



13. Wing of Mongoma niveitarsis. 



Plate 6G. 

 Fig. 14. Wing of Gonomyia puer. 



15. Wing of Gonomyia urdcolor. 



16. Wing of Polymera niveitarsis. 



17. Wing of Polymera pleuralis. 



18. Wing of Polymera obscura. 



19. Wing of Limnophila nacrea. 



20. Wing of Erioptera immaculata. 



21. Wing of Limnophila Icntoides. 



22. Wing of Mongoma disjuncta. 



23. Wing of Gnophomyia subhyalina. 



