30 Psyche [April 



end of middle third of length narrowing to a much narrower blade 

 which distad expands a little, somewhat clavatel3% the end being 

 rounded, with no acute or spine-like process. Basal spine short 

 and stout, at tip subconically narrowed, the apex narrowly rounded. 



Length near 42 mm. Width 10 mm. 

 Locality. Glendale Hills, south of Nashville. April 21, 1917. 

 One male. 



Hillsboro Hills, Nashville, April 22, 1917. One female appar- 

 ently of this species. 



Also "Beyond Glendale," Oct. 14, 1916. One male and an im- 

 mature specimen. The male is not in full color, the brighter 

 carinal and marginal markings being scarcely evident. The gen- 

 eral color is dusky over a dull yellow background. A dark median 

 longitudinal dorsal line shows posteriorly. It appears to be a 

 recently moulted individual. 



NOTES ON DIPTERA.i 



By J. M. Aldrich. 



(a) In studying the habits of the "salt-fly" of Great Salt Lake 

 (Ephydra gracilis Pack.) in 1911, I noted that trains crossing the 

 lake on the famous Southern Pacific cutoff west of Ogden raise a 

 constant swarm of these flies for an hour, and many of the insects 

 get into passenger trains in spite of efforts to keep them out by 

 closing the windows. My report says (Jour. N. Y. Ent, Soc, xx, 

 84, 1912), "They become a nuisance ... in the dining cars. 

 I had no difficulty in finding some of the flies in the latter situa- 

 tion as far west as Reno, Nev., and I doubt not that they may be 

 found after the cars reach Oakland." 



I can now add that the species has established itself in San Fran- 

 cisco Bay. On July 10, 1917, in sweeping about several little 

 saline pools close to the shore of the Bay next to Palo Alto, I cap- 

 tured 18 specimens, indicating that it is a common species 30 miles 

 south of the Oakland mole. I had no opportunity to examine 

 other portions of the Bay shore. 



Prior to the running of trains across Great Salt Lake, which 



'Published by permission of the Chief of the U. S. Bureau of Entomology, 



