96 Journal New York Entomological Society. [^"i- ^^^ 



It is everywhere more difficult to find the larvae of this species 

 than of the two preceding; I found them only twice. This may be 

 on account of the adults moving farther from the place of emergence 

 than in the other species, or possibly they form more distinct broods, 

 so that no larvae are left behind, but all transform nearly together. 



Packard's notice of what he called Jialophila contains the fol- 

 lowing quotation from his correspondent (E. T. Cox) at the 

 Equality Salt Works: 



" I send you the larva and pupa of a dipterous insect (Ephydra) 

 found in the brine at the salt works near Equality, Gallatin Co., 111., 

 in such prodigious quantities as to fill up the wooden conduit pipes. 

 These larvae [puparia — Packard] are gregarious, collecting in masses 

 and form great rope-like bunches by clinging around small fibrous 

 roots on the sides of the little ditch that conveys the brine from the 

 first ' Graduation or Thorn House,' to the pump at the furnace. The 

 brine as it comes from the well has a strength equal to /.t, Baume, 

 and is graduated after the German plan, by showering it successively 

 over thorn bushes arranged on beams from top to bottom of three 

 separate frames, from forty to forty-five high, called ' Graduation or 

 Thorn Houses.' What is remarkable in this is, that the above larvae 

 can nowhere be found except in the brine after first gradation, that is, 

 passed over the first house, where they are found in such quantities 

 as to prove a great nuisance." 



A similar case is reported to me from brine pools near the salt 

 works at Ithaca, N. Y., by Dr. O. A. Johannsen, now of the Maine 

 Experiment Station, who sent me specimens for identification. The 

 larvae in this case were found in pools of varying density, ranging 

 from 1.5 to 6.5 grams of salt per liter of water. The noticeably 

 greater density of the water in the case quoted by Packard is as yet 

 unexplained ; no further observations at that place have been made. 



Ephydra Millbrae Jones. 



Jones, Tech. Bull. Cal. Ex. Sta., Vol. I, No. 2, pp. 155-159, 1906. Adult, pupa, 

 puparium, larva and egg described ; several figs. Breeding in salt marshes 

 on southwest side of San Francisco Bay, Cal. 



This Species (Fig. 6) is closely allied to subopaca, if not even 

 identical with it. The primary difference in the adult is the darker 

 color of the legs, the femora being dark greenish with a slight metallic 



