June, I9I2.] AlDRICH : BlOLOGY OF WESTERN EPHYDRA. 93 



A. J. Cook, now Horticultural Commissioner of California, told me 

 of one before I could ask him. Later Dr. E. C. Van Dyke gave me 

 full directions about reaching the place. It is a small, strongly 

 alkaline pond close to the shore of Clear Lake, some three or four miles 

 south of Soda Bay, and is called Borax Pond or Borax Lake. I made 

 a special trip from San Francisco, taking two days' time, and was 

 successful in collecting E. Iiiaiis at this borax pond. This, I think, 

 makes it reasonably certain that calif oniica is a synonym of liiaiis. 



Ephydra subopaca Loew. 



Loew, Centuries, V, 99, 1864. Adult described from Connecticut. 

 Packard, Proceedings of the Essex Institute, VI, 46, 1868 (issued March, 

 1870) ; puparium and adult described as Ephydra halophila, a preoccu- 

 pied name ; from brine at Equality Salt Works, Gallatin Co., III. Syn- 

 onymy by Coquillett, in lift. 

 Johnson, Proc. Acad. Nat. Sciences of Philadelphia, 1895, 339, occurrence at 



Charlotte Harbor, Fla. 

 Smith, Catalogue Insects of New Jersey, 1899, 693, occurrence in New Jersey; 



second edition, 1909, 807, same, several localities. 

 Johnson, Entomological News, XV, 163, 1904, oc. at Atlantic City and Sea- 

 side Park, N. J. 



Adult (PI. VII, Fig. 5). — A yellow-legged species with rather dense yellow 

 pollen, front metallic blue-green, the fifth segment of the abdomen in the male 

 nearly twice as long as the fourth. 



Front metallic blue-green, bright, in the female with a pair of small 

 decussate bristles on the lower part of the front and several hairs above and 

 below these as well as a few scattering small hairs along the sides of the 

 shining portion ; in the male these hairs and bristles of the front are little 

 developed ; three orbital bristles, with hairs intermingled ; two verticals each 

 side ; behind the main pair of ocellar bristles are two pairs of hairs ; orbits 

 yellow-pollinose. Face yellow-pollinose, with a small shining bluish spot in 

 the median line below the antenna;, covered with small black hairs and two 

 transverse rows of bristles, one of which is directed downward along the 

 margin of the mouth and is composed of long bristles in the female; the other 

 follows the upper edge of the protuberance and the bristles bend outward and 

 upward, especially those near the middle. Eye small and oblique, one large 

 bristle on the broad cheek. Palpi yellow. Thorax yellow pollinose, dorsum a 

 little shining in some specimens (when abraded), covered with small black 

 hairs. Dorsocentrals 4 (i before the suture), prescutellars one median pair, 

 humerals i and several hairs, posthumeral i, presutural i ; scutellar two pairs; 

 before the scutellum the hairs are noticeably long. Mesopleura hairy except 

 on the front part, on its hind edge with a row of long hairs and one bristle ; 

 stenopleura hairy and with one bristle. Tegula yellow, with abundant pale 



