4 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 123 



1964, Spangler; 1 9, same, Mar. 25, 1964, H. Robinson; 1 9, no locality, 

 July 1964, F. D. Bennett. 



Remarks. — A group of five known species, all from Florida and 

 the Caribbean area, show close relationships to one another. These 

 are Cyphomyia chalybea (Wiedemann), the type of Osten Sacken's 

 nominal genus Neorondania {—Rondania Jaennicke, 1867, preoccupied 

 by Rondania Bigot 1854), C. marginata Loew, C. lasiophthalma 

 Williston 1896 (not Williston 1900), C. brevis James, and the present 

 species. Cyphomyia anchialus Walker is probably, as Kertesz con- 

 sidered it, a synonym of C. chalybea. All species are relatively short 

 and stocky for the genus, with hairy eyes and an antennal flagellum 

 that tapers to an acute style. There are only minor differences, possibly 

 not constant, in the structure of the male genitalia. Cyphomyia 

 brevis has very short eye pile in both sexes and the femora are reddish 

 yellow, contrasting with the darker, brownish tibiae; C. marginata 

 is easily separable by its reddish-brown scutellum. 



The remaining three species are more difficult to separate. 

 Cyphomyia chalybea differs from C. dominicana in its shorter antennal 

 flagellum (less than half the head width) ; the flagellum is broadly 

 reddish yellow on its basal four or more segments, and the silvery 

 tomentose spots on the abdomen are much more conspicuous than 

 in C. dominicana. The description of C. lasiophthalma from St. 

 Vincent agrees with C. dominicana in most respects except for the 

 metallic blue color of the frontal triangle in the male and the assump- 

 tion one must draw from the description that the eyes of the female, 

 like those of the male, have long pile. Two males from Grenada 

 (Botanical Gardens, Nov. 12, 1918, Harold Morrison) agree with 

 Williston's description and seem to be his species; as in C. chalybea, 

 the base of the flagellum (three segments) is distinctly reddish yellow 

 and the silvery abdominal spots are relatively conspicuous; the 

 antennal flagellum is 0.50 the head width. 



Pelagomyia illucens, new species 



Figure 2 



Close to the type-species of the genus, P. albitalus Williston from 

 St. Vincent; that species is described as having the face, frons, and 

 thorax shining deep green and the thorax with erect black pile, a 

 characterization that does not apply to the Dominican species. 

 Pelagomyia fasciata (Thomson) (=P. dubia Curran), from the Gala- 

 pagos Islands, is a nonmetallic species with very short pile on the 

 eyes. 



Male. — Head mainly shining black, in certain lights with dull 

 green reflections; a narrow transverse yellow band on upper part of 



