4 DIPTERA OF THE FAMILY EPHYDRIDAE 



Abdomen sliijhtly broader than thorax, sparingly clothed with appresscd setulae; later- 

 ally and vciitrally more strongly so; second to fourth segments suhcqual in lengths; fifth 

 slightly longer. 



Bristles of legs strong and numerous but not seriated except on the flexor margins; 

 setae of posterior margin of fore femora in length equal to diameter of the femora; middle 

 femora with postflexor comb of closely set spinules on distal three- fourths. Wings translu- 

 cent, immaculate, with dark veins; venation normal except that the post-crossvein very 

 strongly undulated; ultimate section of fourth vein not as long as the penultimate; squamae 

 white with black cilia. 



Length, 6 mm. 



Type S ; Indian Tibet: Tso-kar, 14,850 feet altitude. September 5, 1932. 

 (G. E. Hutchinson.) 



A^ote on the larvae and puparia 



P 10. Punjab: Son Sakasar Kahar, March 13, 1932, from submerged branches of 

 brush; pH 8.9; 89,306 parts non-volatile solids per million. Three larvae 

 and six puparia. 



L40. Indian Tibet: Panggong Tso, Lagoon II, west end, June 20, 1932; pH 9.3, 

 alkali reserve 0.0085 N., chloride 0.0007 N., cold water. Two larvae and 

 one puparium. 



The larvae of this lot have two dorsal longitudinal clusters of closely set spinules on seg- 

 ments one to four, becoming rounded or sometimes coalescing into transverse bands on five 

 to eight; seventh prolog well developed; post-anal tubercle also distinctly developed. The 

 puparia have a total length of 6.5 mm. ; greatest thickness at third segment of 2 mm. ; 

 length of anal tube 1.5 mm., two and a half times as long as its basal diameter; length of 

 respiratory tube .6 mm. ; dorsal profile of segments one to five practically straight, that of 

 six to eight convex, causing the prolegs of six and eight to approximate each other to almost 

 touching; proleg of seven scarcely developed, represented only as a slight swelling bearing a 

 few curved spinules. 



L 58. Indian Tibet: Kyam hot springs, July 19, 1932; 1055 parts non-volatile solids 

 per million; one larva and several puparia. This form agrees well with Brues description and 

 figure of Ephydra pcctimdata Cresson, described from the Yellowstone Park, Wyoming," but 

 I note the following differences: Larva with dorsal patch of spinules as described on the 

 larvae from Panggong; prolegs with two transverse rows of curved hooks, those in the 

 anterior series much the stronger and usually four in number. Otherwise the larva and 

 puparium as described from Panggong except that the anal tube is shorter, which character 

 seems to vary considerably. This form may be Ephydra tibetetisis here described. 



Another larva collected from the above locality, July 20, 1932, in a small pool with tem- 

 perature of 35.6 C, appears to be of the form described from Panggong, lagoon II. 



L80. Indian Tibet: Phuga hot springs, August 25, 1932, temp. 49.1°C.; pH 8.6; 

 alkali reserve 0.0144N ; chloride 0.01 12N ; very rich in HoS. Eight larvae which appear to Ije 

 same as those described from Panggong, but their lengths are 4.2 to 6 mm.; anal tube of 

 largest, .9 mm. 



•Proc. Am. Acad. A. & Sci., LIX, pp. 403-405, fig. 5 (1924). 



