410 THE NOB TR AMEEICAN EMPID^—COQUILLETT. vol. xviii. 



are too brief to permit of giving them a place iu the accompanyiug 

 table: agasides, anaxo, cilipcs, coplias, dana, daria, ecetra, ficana, ffavi- 

 rostris, nigrita, scolopacea, and tristis. 



Since the publication of Osteu Sacken's Catalogue, Bigot ^ has pub- 

 lished descriptions of four isorth American species belonging to the 

 present genus. His B. morrisoni appears to be synonymous with E. 

 rava, Loew; B. xKicliymera^ Bigot, is too imperfectly described to admit 

 it in the table given below; the names ni/fHta and (/eniculata, which he 

 uses for two of his species, are preoccupied, and Bigot's descriptions 

 had therefore better be canceled. 



RHAMPHOMYIA RAVA, Loew. 



Dr. Loew describes the wings in both sexes of this species as being 

 somewhat reddish brown. In a large series of specimens that I have 

 examined, captured in the same locality, the males agree in all respects 

 with Dr. Loew's description of B. rava, but the females invariably have 

 the wings much lighter colored at the base than at the apex. I strongly 

 suspect that Loew founded his description on males of B. rava and 

 females of my new species B. ravida, which closely resembles B. rava, 

 differing chiefly in the male genitalia and the uniformly brown wings 

 of the female. 



RHAMPHOMYIA BASALIS, Loew 



Dr. Loew describes the female only. The National Museum contains 

 six males and as many females from the White Mountains, New Hamp- 

 shire, all of them taken by the same collector (Morrison), and evidently 

 belonging to this species. In size, structure of antennte, and general 

 coloring, the two sexes are alike, but they differ widely iu the shape 

 and color of the wings and in the structure of the legs; iu the female 

 the wings are unusually broad, brownish, the base hyaline; while in the 

 male they are narrow and wholly hyaline. In the female the legs are 

 destitute of processes and excisions; in the male each hind femur is 

 hollowed out on the under side just before the apex, and before this 

 hollow is a rather large rounded process ; each hind tibia is also hol- 

 lowed out on the inner side at a point opposite that iu the femur; thus 

 when the leg is folded, a hollow space is formed between each femur 

 and its tibia; the outer edge of the hollow in the tibia is fringed with 

 flattened seta?. 



AXALYTICAL KEY TO THE SPECIES OF RHAMPHOMYIA. 



1. Thorax, inclucliug the pleura, wholly black 9 



Thorax, or at least the pleura, more or less yellow or reddish 2 



2. Dorsum of thorax marked with black 4 



Dorsum of thorax wholly yellowish, destitute of black markings 3 



' Bull. Soc. Eut. France, 1887, pp. 141-142. Auu. Soc. j:nt. France, 1889, pp. 132-134. 



