82 



KELLOGG. 



[VOL. I. 



by Mr. J. C. Brown, a student assistant in my laboratory, at 

 Point Lobos, a rocky point on the Pacific Coast near Monterey, 

 California. The flies, of which there were many ("thousands," 

 says Mr. Brown), were resting or running on the surface of the 

 ocean water of tide pools and had a tendency to gather in large 

 numbers in "patches " and in "ball-like masses" on the water. 

 None were seen below the surface, nor were any seen flying. 

 They moved about on the surface of the water very rapidly. In 

 the last week of March, 1899, I visited Point Lobos and searched 

 carefully for the fly, examining the same tide pools on which 



FIG. i. Eretmoptera brtnvni ; male and female. 



Mr. Brown found his specimens ; but no flies were to be found, 

 nor were there any dipterous larvae or pupae in these pools. 

 Mr. Brown also searched again in July and August without 

 finding more specimens. So we have as yet no knowledge of 

 the eggs and larvae, nor of the course of the life history of 

 the fly. 



The new form may be named and described as follows : 

 Eretmoptera browninov. gen. ct sp. Male (Fig. i). Length 

 2 mm. Head slightly broader than thorax ; eyes widely sepa- 

 rated, very small, very convex, hairy, and with rather large 



