142 Mr. C. IT. T. Townsend on Diptera 



than in Brownsville and Lower Californian specimens. It 

 is evidently the same species, although the more prevailing 

 black of posterior half of abdomen gives it a slightly different 

 facies. It may, perhaps, represent a northern race of this 

 tropical species. 



Note. — Mr. W. A. Snow, in his '^ Supplementary List of 

 North- American Syrphidas " (Kans. Univ. Quart.), has 

 followed Giglio-Tos in considering E. tricolor, Jaenn., a 

 synonym of E. pitsillus, Mcq. 1 fail to see anything in 

 Macquart's description that would lead me to believe in this 

 synonymy. 



8. ChrysochJamys croesus, O. S. 



One female, Rio Ruidoso, 4 miles west of Bowling's Mill, 

 6600 feet. On flowers of Rhus glabra, L., July 10 ( Wooton). 

 Length 9 nTillim. 

 Legs wholly saturate reddish yellow, only the coxffi fuscous. 



9. Milesia hella, sp. n. 



Two specimens (male and female), Rio Ruidoso, 4 miles 

 west of Dowling's Mill, 6600 feet. On flowers of Rhus 

 glabra f L., July 10 {Wooto7i). 



Length of male 15 millim., of female hardly 16 raillim. 



Differs from Williston's description of M. ornata (Syn. 

 p. 255) as follows : — Male with triangular brown spot at base 

 of antennae above; female with posterior orbits more cine- 

 reous tiian yellow, though this character is doubtless more or 

 less variable. The anterior two yellow fasciae of prothoracic 

 dorsum roughly forming a yellow transverse H-shaped 

 marking, cleft through the middle of the bar by a rather wide 

 black vitta ; the suboval humeral spot helps to form this, but 

 docs not coalesce with it, being separated by a narrow neck 

 of black from the rest of the iialf of the marking of that side, 

 which is L-shajK'd on the right side and the reverse on the 

 left. Pleura?, without yellow on anterior border froui humeri 

 to base of anterior coxae, black. Second abdominal segment 

 with a yellow cross-band interrupted in middle, anterior 

 border of each half running obliquely outward an 1 forward, 

 hind border sinuate ; a transversely elongate yellowish spot 

 behind these on each side on posterior corner of segment. 

 Third and fourth segments in male with an anterior unin- 

 terrupted yellow cross-band, widened at ends ; the third 

 segment with a posterior brownish-yellow band of same 

 width not widened at ends, this band on fourth segment being 

 twice as broad as on thiifl. In female the yellow (anterior) 



